1805 changed files with 107907 additions and 212989 deletions
--- a/.coveralls.yml
+++ b/.coveralls.yml
@ -0,0 +1,2 @@
+service_name: travis-pro
+repo_token: GZXuNlublKFy7HAewHAZLk5ZwgipTFAOA
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@ -1,2 +1 @@
 open_collective: assimp
-patreon: assimp
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@ -1,8 +1,8 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: 'Bug:'
-labels: 'Bug'
+title: ''
+labels: ''
 assignees: ''

 ---
@ -23,10 +23,16 @@ A clear and concise description of what you expected to happen.
 **Screenshots**
 If applicable, add screenshots to help explain your problem.

-**Platform (please complete the following information):**
+**Desktop (please complete the following information):**
 - OS: [e.g. iOS]
 - Browser [e.g. chrome, safari]
 - Version [e.g. 22]

+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
 **Additional context**
 Add any other context about the problem here.
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: 'Feature-Request'
+labels: ''
 assignees: ''

 ---
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@ -1,11 +0,0 @@
-version: 2
-updates:
- package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-  - package-ecosystem: "gitsubmodule"
-    directory: "/"  # the .gitmodules file must be placed at the top-level directory of a git working tree
-    schedule:
-      interval: "weekly"
-    open-pull-requests-limit: 15  # Assimp has 15 dependencies
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@ -6,140 +6,12 @@ on:
  pull_request:
    branches: [ master ]

-permissions:
-  contents: write # to fetch code (actions/checkout),and release
-
 jobs:
-  build:
+  job:
    name: ${{ matrix.name }}-build-and-test
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
-      matrix:
-        name: [ubuntu-latest-g++, macos-latest-clang++, windows-latest-cl.exe, ubuntu-latest-clang++]
-        # For Windows msvc, for Linux and macOS let's use the clang compiler, use gcc for Linux.
-        include:
-          - name: windows-latest-cl.exe
-            os: windows-latest
-            cxx: cl.exe
-            cc: cl.exe
-          - name: ubuntu-latest-clang++
-            os: ubuntu-latest
-            cxx: clang++
-            cc: clang
-          - name: macos-latest-clang++
-            os: macos-latest
-            cxx: clang++
-            cc: clang
-          - name: ubuntu-latest-g++
-            os: ubuntu-latest
-            cxx: g++
-            cc: gcc
-
-    steps:
-    - name: ccache
-      uses: hendrikmuhs/ccache-action@v1.2
-      
-    - uses: actions/checkout@v4
-      with:
-          submodules: true
-          
-    - uses: lukka/get-cmake@latest
-    
-    - uses: ilammy/msvc-dev-cmd@v1
-    
-    - name: Set Compiler Environment
-      uses: lukka/set-shell-env@v1
-      with:
-        CXX: ${{ matrix.cxx }}
-        CC: ${{ matrix.cc }}
-
-    - name: Cache DX SDK
-      id: dxcache
-      if: contains(matrix.name, 'windows')
-      uses: actions/cache@v4
-      with:
-        path: '${{ github.workspace }}/DX_SDK'
-        key: ${{ runner.os }}-DX_SDK
-        restore-keys: |
-          ${{ runner.os }}-DX_SDK
-
-    - name: Download DXSetup
-      if: contains(matrix.name, 'windows') && steps.dxcache.outputs.cache-hit != 'true'
-      run: |
-        curl -s -o DXSDK_Jun10.exe --location https://download.microsoft.com/download/A/E/7/AE743F1F-632B-4809-87A9-AA1BB3458E31/DXSDK_Jun10.exe
-        cmd.exe /c start /wait .\DXSDK_Jun10.exe /U /O /F /S /P "${{ github.workspace }}\DX_SDK"
-
-    - name: Set Windows specific CMake arguments
-      if: contains(matrix.name, 'windows')
-      id: windows_extra_cmake_args
-      run: echo ":set-output name=args::=-DASSIMP_BUILD_ASSIMP_TOOLS=1 -DASSIMP_BUILD_ASSIMP_VIEW=1" >> $GITHUB_OUTPUT
-    
-    - name: Set Hunter specific CMake arguments
-      if: contains(matrix.name, 'hunter')
-      id: hunter_extra_cmake_args
-      run: echo "args=-DBUILD_SHARED_LIBS=OFF -DASSIMP_HUNTER_ENABLED=ON -DCMAKE_TOOLCHAIN_FILE=${{ github.workspace }}/cmake/polly/${{ matrix.toolchain }}.cmake" >> $GITHUB_OUTPUT
-
-    - name: configure and build
-      uses: lukka/run-cmake@v3
-      env:
-        DXSDK_DIR: '${{ github.workspace }}/DX_SDK'
-
-      with:
-        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
-        cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
-        cmakeAppendedArgs: '-GNinja -DCMAKE_BUILD_TYPE=Release ${{ steps.windows_extra_cmake_args.outputs.args }} ${{ steps.hunter_extra_cmake_args.outputs.args }}'
-        buildWithCMakeArgs: '--parallel 24 -v'
-        buildDirectory: '${{ github.workspace }}/build/'
-        
-    - name: Exclude certain tests in Hunter specific builds
-      if: contains(matrix.name, 'hunter')
-      id: hunter_extra_test_args
-      run: echo "args=--gtest_filter=-utOpenGEXImportExport.Importissue1340_EmptyCameraObject:utColladaZaeImportExport.importBlenFromFileTest" >> $GITHUB_OUTPUT
-
-    - name: test
-      run: cd build/bin && ./unit ${{ steps.hunter_extra_test_args.outputs.args }}
-      shell: bash
-
-    - uses: actions/upload-artifact@v4
-      if: matrix.name == 'windows-msvc'
-      with:
-        name: 'assimp-bins-${{ matrix.name }}'
-        path: build/bin/assimp*.exe
-        
-    - uses: marvinpinto/action-automatic-releases@latest
-      if: contains(matrix.name, 'windows-msvc-hunter')
-      with:
-        repo_token: "${{ secrets.GITHUB_TOKEN }}"
-        automatic_release_tag: "master"
-        prerelease: true
-        title: "AutoRelease"
-        files: |
-          build/bin/assimp*.exe
-
-  create-release:
-    needs: [build]
-    runs-on: ubuntu-latest
-    if: startsWith(github.ref, 'refs/tags/')
-    steps:
-      - id: create-release
-        uses: actions/create-release@v1
-        env:
-          GITHUB_TOKEN: '${{secrets.GITHUB_TOKEN}}'
-        with:
-          tag_name: '${{github.ref}}'
-          release_name: 'Release ${{github.ref}}'
-          draft: false
-          prerelease: true
-      - run: |
-          echo '${{steps.create-release.outputs.upload_url}}' > release_upload_url.txt
-      - uses: actions/upload-artifact@v4
-        with:
-          name: create-release
-          path: release_upload_url.txt
-
-  upload-release:
-    strategy:
      matrix:
        name: [ubuntu-latest-g++, macos-latest-clang++, windows-latest-cl.exe, ubuntu-latest-clang++, ubuntu-gcc-hunter, macos-clang-hunter, windows-msvc-hunter]
        # For Windows msvc, for Linux and macOS let's use the clang compiler, use gcc for Linux.
@ -170,23 +42,88 @@ jobs:
            os: windows-latest
            toolchain: ninja-vs-win64-cxx17

-    needs: [create-release]
-    runs-on: ubuntu-latest
-    if: startsWith(github.ref, 'refs/tags/')
    steps:
-      - uses: softprops/action-gh-release@v2
+    - uses: actions/checkout@v2
+    
+    - uses: lukka/get-cmake@latest
+    
+    - uses: ilammy/msvc-dev-cmd@v1
+    
+    - name: Set Compiler Environment
+      if: "!endsWith(matrix.name, 'hunter')"
+      uses: lukka/set-shell-env@v1
      with:
-          name: create-release
-      - id: upload-url
+        CXX: ${{ matrix.cxx }}
+        CC: ${{ matrix.cc }}
+
+    - name: Set Compiler Environment for Hunter on Windows
+      if: startsWith(matrix.name, 'windows') && endsWith(matrix.name, 'hunter')
+      uses: lukka/set-shell-env@v1
+      with:
+        VS160COMNTOOLS: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\Tools
+
+    - name: Checkout Hunter toolchains
+      if: endsWith(matrix.name, 'hunter')
+      uses: actions/checkout@v2
+      with:
+        repository: cpp-pm/polly
+        path: cmake/polly
+
+    - name: Remove contrib directory for Hunter builds
+      if: contains(matrix.name, 'hunter')
+      uses: JesseTG/rm@v1.0.2
+      with:
+        path: contrib
+
+    - name: Cache DX SDK
+      id: dxcache
+      if: contains(matrix.name, 'windows')
+      uses: actions/cache@v2
+      with:
+        path: '${{ github.workspace }}/DX_SDK'
+        key: ${{ runner.os }}-DX_SDK
+        restore-keys: |
+          ${{ runner.os }}-DX_SDK
+
+    - name: Download DXSetup
+      if: contains(matrix.name, 'windows') && steps.dxcache.outputs.cache-hit != 'true'
      run: |
-          echo "url=$(cat create-release/release_upload_url.txt)" >> $GITHUB_OUTPUT
-      - uses: actions/download-artifact@v4
+        curl -s -o DXSDK_Jun10.exe --location https://download.microsoft.com/download/A/E/7/AE743F1F-632B-4809-87A9-AA1BB3458E31/DXSDK_Jun10.exe
+        cmd.exe /c start /wait .\DXSDK_Jun10.exe /U /O /F /S /P "${{ github.workspace }}\DX_SDK"
+
+    - name: Set Windows specific CMake arguments
+      if: contains(matrix.name, 'windows')
+      id: windows_extra_cmake_args
+      run: echo "::set-output name=args::-DASSIMP_BUILD_ASSIMP_TOOLS=1 -DASSIMP_BUILD_ASSIMP_VIEW=1"
+    
+    - name: Set Hunter specific CMake arguments
+      if: contains(matrix.name, 'hunter')
+      id: hunter_extra_cmake_args
+      run: echo "::set-output name=args::-DBUILD_SHARED_LIBS=OFF -DASSIMP_HUNTER_ENABLED=ON -DCMAKE_TOOLCHAIN_FILE=${{ github.workspace }}/cmake/polly/${{ matrix.toolchain }}.cmake"
+
+    - name: configure and build
+      uses: lukka/run-cmake@v3
+      env:
+        DXSDK_DIR: '${{ github.workspace }}/DX_SDK'
+
+      with:
+        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
+        cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
+        cmakeAppendedArgs: '-GNinja -DCMAKE_BUILD_TYPE=Release ${{ steps.windows_extra_cmake_args.outputs.args }} ${{ steps.hunter_extra_cmake_args.outputs.args }}'
+        buildWithCMakeArgs: '-- -v'
+        buildDirectory: '${{ github.workspace }}/build/'
+        
+    - name: Exclude certain tests in Hunter specific builds
+      if: contains(matrix.name, 'hunter')
+      id: hunter_extra_test_args
+      run: echo "::set-output name=args::--gtest_filter=-utOpenGEXImportExport.Importissue1340_EmptyCameraObject:utColladaZaeImportExport.importBlenFromFileTest"
+
+    - name: test
+      run: cd build/bin && ./unit ${{ steps.hunter_extra_test_args.outputs.args }}
+      shell: bash
+
+    - uses: actions/upload-artifact@v2
+      if: matrix.name == 'windows-msvc'
      with:
        name: 'assimp-bins-${{ matrix.name }}-${{ github.sha }}'
-      - uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: '${{secrets.GITHUB_TOKEN}}'
-        with:
-          files: |
-            *.zip
- 
+        path: build/bin
--- a/.github/workflows/cifuzz.yml
+++ b/.github/workflows/cifuzz.yml
@ -1,26 +0,0 @@
-name: CIFuzz
-on: [pull_request]
-jobs:
-  Fuzzing:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Build Fuzzers
-      id: build
-      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
-      with:
-        oss-fuzz-project-name: 'assimp'
-        dry-run: false
-        language: c++
-    - name: Run Fuzzers
-      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
-      with:
-        oss-fuzz-project-name: 'assimp'
-        fuzz-seconds: 300
-        dry-run: false
-        language: c++
-    - name: Upload Crash
-      uses: actions/upload-artifact@v4
-      if: failure() && steps.build.outcome == 'success'
-      with:
-        name: artifacts
-        path: ./out/artifacts
--- a/.github/workflows/inno_setup
+++ b/.github/workflows/inno_setup
@ -1,51 +0,0 @@
-name: Build Windows Installer
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-jobs:
-  build:
-    name: Build the Inno Setup Installer
-    runs-on: windows-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: lukka/get-cmake@latest
-      - uses: ilammy/msvc-dev-cmd@v1
-
-
-      - name: Cache DX SDK
-        id: dxcache
-        uses: actions/cache@v4
-        with:
-          path: '${{ github.workspace }}/DX_SDK'
-          key: ${{ runner.os }}-DX_SDK
-          restore-keys: |
-            ${{ runner.os }}-DX_SDK
-
-      - name: Download DXSetup
-        run: |
-          curl -s -o DXSDK_Jun10.exe --location https://download.microsoft.com/download/A/E/7/AE743F1F-632B-4809-87A9-AA1BB3458E31/DXSDK_Jun10.exe
-          cmd.exe /c start /wait .\DXSDK_Jun10.exe /U /O /F /S /P "${{ github.workspace }}\DX_SDK"
-
-      - name: Set Windows specific CMake arguments
-        id: windows_extra_cmake_args
-        run: echo "::set-output name=args::-DASSIMP_BUILD_ASSIMP_TOOLS=1 -DASSIMP_BUILD_ASSIMP_VIEW=1 -DASSIMP_BUILD_ZLIB=1"
-
-      - name: configure and build
-        uses: lukka/run-cmake@v3
-        env:
-          DXSDK_DIR: '${{ github.workspace }}/DX_SDK'
-
-        with:
-          cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
-          cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
-          cmakeAppendedArgs: '-GNinja -DCMAKE_BUILD_TYPE=Release ${{ steps.windows_extra_cmake_args.outputs.args }} ${{ steps.hunter_extra_cmake_args.outputs.args }}'
-          buildWithCMakeArgs: '--parallel 24 -v'
-          buildDirectory: '${{ github.workspace }}/build/'
-
-      - name: Compile .ISS to .EXE Installer
-        uses: Minionguyjpro/Inno-Setup-Action@v1.2.2
-        with:
-          path: packaging/windows-innosetup/script_x64.iss
-          options: /O+
--- a/.github/workflows/sanitizer.yml
+++ b/.github/workflows/sanitizer.yml
@ -6,15 +6,12 @@ on:
  pull_request:
    branches: [ master ]

-permissions:
-  contents: read # to fetch code (actions/checkout)
-
 jobs:
  job1:
    name: adress-sanitizer
    runs-on: ubuntu-latest
    steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v2
    - uses: lukka/get-cmake@latest    
    - uses: lukka/set-shell-env@v1
      with:
@ -38,7 +35,7 @@ jobs:
    name: undefined-behavior-sanitizer
    runs-on: ubuntu-latest
    steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v2
    - uses: lukka/get-cmake@latest    
    - uses: lukka/set-shell-env@v1
      with:
@ -46,7 +43,7 @@ jobs:
        CC: clang
    
    - name: configure and build
-      uses: lukka/run-cmake@v3
+      uses: lukka/run-cmake@v2
      with:
        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
        cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
@ -57,13 +54,3 @@ jobs:
    - name: test
      run: cd build/bin && ./unit
      shell: bash
-
-  job3:
-    name: printf-sanitizer
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    
-    - name: run scan_printf script
-      run: ./scripts/scan_printf.sh
-      shell: bash
--- a/.gitignore
+++ b/.gitignore
@ -25,7 +25,7 @@ CMakeSettings.json
 # Output
 bin/
 lib/
-x64/
+
 # QtCreator
 CMakeLists.txt.user

@ -94,7 +94,6 @@ test/gtest/src/gtest-stamp/gtest-gitinfo.txt
 test/gtest/src/gtest-stamp/gtest-gitclone-lastrun.txt
 Assimp.opensdf
 contrib/zlib/CTestTestfile.cmake
-contrib/zlib/Debug/zlibstaticd.pdb
 ipch/assimp_viewer-44bbbcd1/assimp_viewerd-ccc45335.ipch
 bin64/assimp-vc140-mt.dll
 bin64/assimp-vc140-mtd.dll
@ -120,7 +119,3 @@ tools/assimp_qt_viewer/ui_mainwindow.h

 #Generated directory
 generated/*
-
-# 3rd party cloned repos/tarballs etc
-# tinyusdz repo, automatically cloned via CMake
-contrib/tinyusdz/autoclone
--- a/.travis.sh
+++ b/.travis.sh
@ -0,0 +1,67 @@
+#---------------------------------------------------------------------------
+#Open Asset Import Library (assimp)
+#---------------------------------------------------------------------------
+# Copyright (c) 2006-2020, assimp team
+#
+# License see LICENSE file
+#
+function generate() {
+    OPTIONS="-DASSIMP_WERROR=ON"
+    OPTIONS="$OPTIONS -DASSIMP_NO_EXPORT=NO"
+    
+    if [ "$DISABLE_EXPORTERS" = "YES" ] ; then
+        OPTIONS="$OPTIONS -DASSIMP_NO_EXPORT=YES"
+    else
+        OPTIONS="$OPTIONS -DASSIMP_NO_EXPORT=NO"
+    fi
+
+    if [ "$SHARED_BUILD" = "ON" ] ; then
+        OPTIONS="$OPTIONS -DBUILD_SHARED_LIBS=ON"
+    else
+        OPTIONS="$OPTIONS -DBUILD_SHARED_LIBS=OFF"
+    fi
+
+    if [ "$ENABLE_COVERALLS" = "ON" ] ; then
+        OPTIONS="$OPTIONS -DASSIMP_COVERALLS=ON"
+    else
+        OPTIONS="$OPTIONS -DASSIMP_COVERALLS=OFF"
+    fi
+
+    if [ "$ASAN" = "ON" ] ; then
+        OPTIONS="$OPTIONS -DASSIMP_ASAN=ON"
+    else
+        OPTIONS="$OPTIONS -DASSIMP_ASAN=OFF"
+    fi
+
+    if [ "$UBSAN" = "ON" ] ; then
+        OPTIONS="$OPTIONS -DASSIMP_UBSAN=ON"
+    fi
+
+    cmake -G "Unix Makefiles" $OPTIONS
+}
+# build and run unittests, if not android
+if [ $ANDROID ]; then
+    ant -v -Dmy.dir=${TRAVIS_BUILD_DIR} -f ${TRAVIS_BUILD_DIR}/port/jassimp/build.xml ndk-jni
+fi
+if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+  if [ $ANALYZE = "ON" ] ; then
+    if [ "$CC" = "clang" ]; then
+        scan-build cmake -G "Unix Makefiles" -DBUILD_SHARED_LIBS=OFF -DASSIMP_BUILD_TESTS=OFF
+        scan-build --status-bugs make -j2
+    else
+        cppcheck --version
+        generate \
+        && cppcheck --error-exitcode=1 -j2 -Iinclude -Icode code 2> cppcheck.txt
+        if [ -s cppcheck.txt ]; then
+            cat cppcheck.txt
+            exit 1
+        fi
+    fi
+  else
+    generate \
+    && make -j4 \
+    && sudo make install \
+    && sudo ldconfig \
+    && (cd test/unit; ../../bin/unit)
+  fi
+fi
--- a/.travis.yml
+++ b/.travis.yml
@ -0,0 +1,78 @@
+sudo: required
+language: cpp
+
+cache: ccache
+
+before_install:
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get update -qq && sudo apt-get install cmake cppcheck && sudo apt-get install cmake python3 && sudo apt-get install -qq freeglut3-dev libxmu-dev libxi-dev ; echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca- ; fi
+  - 'if [ "$TRAVIS_OS_NAME" = "osx" ];  then
+       if brew ls --versions cmake > /dev/null; then
+         echo cmake already installed.;
+       else
+         brew install cmake;
+       fi;
+       brew install python3;
+       brew install homebrew/x11/freeglut; 
+    fi'
+  - echo -e "#ifndef A_R_H_INC\n#define A_R_H_INC\n#define GitVersion ${TRAVIS_JOB_ID}\n#define GitBranch \"${TRAVIS_BRANCH}\"\n#endif // A_R_H_INC" > revision.h
+  # install latest LCOV (1.9 was failing)
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then cd ${TRAVIS_BUILD_DIR} && wget http://ftp.de.debian.org/debian/pool/main/l/lcov/lcov_1.11.orig.tar.gz && tar xf lcov_1.11.orig.tar.gz && sudo make -C lcov-1.11/ install && gem install coveralls-lcov && lcov --version && g++ --version ; fi
+
+os:
+  - linux
+
+compiler:
+  - gcc
+  - clang
+
+env:
+  global:
+    - secure: "lZ7pHQvl5dpZWzBQAaIMf0wqrvtcZ4wiZKeIZjf83TEsflW8+z0uTpIuN30ZV6Glth/Sq1OhLnTP5+N57fZU/1ebA5twHdvP4bS5CIUUg71/CXQZNl36xeaqvxsG/xRrdpKOsPdjAOsQ9KPTQulsX43XDLS7CasMiLvYOpqKcPc="
+    - PV=r8e PLATF=linux-x86_64 NDK_HOME=${TRAVIS_BUILD_DIR}/android-ndk-${PV} PATH=${PATH}:${NDK_HOME}
+
+git:
+  depth: 1
+
+matrix:
+  include:
+    - os: linux
+      compiler: clang
+      env: ASAN=ON
+    - os: linux
+      compiler: clang
+      env: UBSAN=ON
+    - os: linux
+      compiler: clang
+      env: SHARED_BUILD=ON
+    - os: linux
+      compiler: gcc
+      env: ANALYZE=ON
+    - os: linux
+      compiler: gcc
+      env: ENABLE_COVERALLS=ON
+    - os: linux
+      compiler: gcc
+      env: SHARED_BUILD=ON
+
+install:
+  - if [ $ANDROID ]; then wget -c http://dl.google.com/android/ndk/android-ndk-${PV}-${PLATF}.tar.bz2 && tar xf android-ndk-${PV}-${PLATF}.tar.bz2 ; fi
+
+before_script:
+  cmake . -DASSIMP_ENABLE_BOOST_WORKAROUND=YES
+
+script:
+  - export COVERALLS_SERVICE_NAME=travis-ci
+  - export COVERALLS_REPO_TOKEN=abc12345
+  - . ./.travis.sh
+ 
+after_success:
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then cd ${TRAVIS_BUILD_DIR} && lcov --directory . --capture --output-file coverage.info && lcov --remove coverage.info '/usr/*' 'contrib/*' 'test/*' --output-file coverage.info && lcov --list coverage.info && coveralls-lcov --source-encoding=ISO-8859-1 --repo-token=${COVERALLS_TOKEN} coverage.info ; fi
+
+addons:
+  coverity_scan:
+    project:
+      name: "assimp/assimp"
+    notification_email: kim.kulling@googlemail.com
+    build_command_prepend: "cmake ./"
+    build_command: "make -j4"
+    branch_pattern: coverity_scan
--- a/BUILDBINARIES_EXAMPLE.bat
+++ b/BUILDBINARIES_EXAMPLE.bat
@ -10,15 +10,16 @@
 :: Also see: https://github.com/assimp/assimp/pull/2646

 SET SOURCE_DIR=.
-SET GENERATOR=Visual Studio 16 2019

-SET BINARIES_DIR="./build/Win32"
-cmake . -G "%GENERATOR%" -A Win32 -S %SOURCE_DIR% -B %BINARIES_DIR%
-cmake --build %BINARIES_DIR% --config debug
+:: For generators see "cmake --help"
+SET GENERATOR=Visual Studio 15 2017
+
+SET BINARIES_DIR="./BINARIES/Win32"
+cmake CMakeLists.txt -G "%GENERATOR%" -S %SOURCE_DIR% -B %BINARIES_DIR%
 cmake --build %BINARIES_DIR% --config release

-SET BINARIES_DIR="./build/x64"
-cmake . -G "%GENERATOR%" -A x64 -S %SOURCE_DIR% -B %BINARIES_DIR%
+SET BINARIES_DIR="./BINARIES/x64"
+cmake CMakeLists.txt -G "%GENERATOR% Win64" -S %SOURCE_DIR% -B %BINARIES_DIR%
 cmake --build %BINARIES_DIR% --config debug
 cmake --build %BINARIES_DIR% --config release

--- a/Build.md
+++ b/Build.md
@ -7,15 +7,14 @@ You can download and install assimp using the [vcpkg](https://github.com/Microso
    cd vcpkg
    ./bootstrap-vcpkg.sh
    ./vcpkg integrate install
-    ./vcpkg install assimp
+    vcpkg install assimp
 ```
 The assimp port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.

 ## Install on Ubuntu
 You can install the Asset-Importer-Lib via apt:
 ```
-sudo apt-get update
-sudo apt-get install libassimp-dev
+sudo apt-get install assimp
 ```

 ## Install pyassimp
@ -27,7 +26,7 @@ pip install pyassimp
 ## Manual build instructions

 ### Install CMake
-Asset-Importer-Lib can be built for a lot of different platforms. We are using cmake to generate the build environment for these via cmake. So you have to make sure that you have a working cmake-installation on your system. You can download it at https://cmake.org/ or for linux install it via
+Asset-Importer-Lib can be build for a lot of different platforms. We are using cmake to generate the build environment for these via cmake. So you have to make sure that you have a working cmake-installation on your system. You can download it at https://cmake.org/ or for linux install it via
 ```bash
 sudo apt-get install cmake
 ```
@ -43,16 +42,15 @@ cd assimp
 cmake CMakeLists.txt 
 cmake --build .
 ```
-Note that by default this builds a shared library into the `bin` directory. If you want to build it as a static library see the build options at the bottom of this file.

 ### Build instructions for Windows with Visual-Studio

-First, you have to install Visual-Studio on your windows-system. You can get the Community-Version for free here: https://visualstudio.microsoft.com/de/downloads/
+First you have to install Visual-Studio on your windows-system. You can get the Community-Version for free here: https://visualstudio.microsoft.com/de/downloads/
 To generate the build environment for your IDE open a command prompt, navigate to your repo and type:
 ```bash
 cmake CMakeLists.txt
 ```
-This will generate the project files for the visual studio. All dependencies used to build Asset-Importer-Lib shall be part of the repo. If you want to use you own zlib installation this is possible as well. Check the options for it.
+This will generate the project files for the visual studio. All dependencies used to build Asset-IMporter-Lib shall be part of the repo. If you want to use you own zlib.installation this is possible as well. Check the options for it.

 ### Build instructions for Windows with UWP
 See <https://stackoverflow.com/questions/40803170/cmake-uwp-using-cmake-to-build-universal-windows-app>
@ -64,9 +62,9 @@ Open a terminal and got to your repository. You can generate the makefiles and b
 cmake CMakeLists.txt
 make -j4
 ```
-The option -j describes the number of parallel processes for the build. In this case make will try to use 4 cores for the build.
+The option -j descripes the number of parallel processes for the build. In this case make will try to use 4 cores for the build.

-If you want to use an IDE for linux you can try QTCreator for instance. 
+If you want to use a IDE for linux you can try QTCreator for instance. 

 ### Build instructions for MinGW
 Older versions of MinGW's compiler (e.g. 5.1.0) do not support the -mbig_obj flag 
@ -86,28 +84,23 @@ Besides the toolchain, compilation should be the same as for Linux / Unix.

 ### CMake build options
 The cmake-build-environment provides options to configure the build. The following options can be used:
- **ASSIMP_HUNTER_ENABLED (default OFF)**: Enable Hunter package manager support.
- **BUILD_SHARED_LIBS (default ON)**: Generation of shared libs (dll for windows, so for Linux). Set this to OFF to get a static lib.
- **ASSIMP_BUILD_FRAMEWORK (default OFF, MacOnly)**: Build package as Mac OS X Framework bundle.
- **ASSIMP_DOUBLE_PRECISION (default OFF)**: All data will be stored as double values.
- **ASSIMP_OPT_BUILD_PACKAGES (default OFF)**: Set to ON to generate CPack configuration files and packaging targets.
- **ASSIMP_ANDROID_JNIIOSYSTEM (default OFF)**: Android JNI IOSystem support is active.
- **ASSIMP_NO_EXPORT (default OFF)**: Disable Assimp's export functionality.
- **ASSIMP_BUILD_ZLIB (default OFF)**: Build our own zlib.
- **ASSIMP_BUILD_ALL_EXPORTERS_BY_DEFAULT (default ON)**: Build Assimp with all exporters enabled.
- **ASSIMP_BUILD_ALL_IMPORTERS_BY_DEFAULT (default ON)**: Build Assimp with all importers enabled.
- **ASSIMP_BUILD_ASSIMP_TOOLS (default OFF)**: If the supplementary tools for Assimp are built in addition to the library.
- **ASSIMP_BUILD_SAMPLES (default OFF)**: If the official samples are built as well (needs Glut).
- **ASSIMP_BUILD_TESTS (default ON)**: If the test suite for Assimp is built in addition to the library.
- **ASSIMP_COVERALLS (default OFF)**: Enable this to measure test coverage.
- **ASSIMP_INSTALL (default ON)**: Install Assimp library. Disable this if you want to use Assimp as a submodule.
- **ASSIMP_WARNINGS_AS_ERRORS (default ON)**: Treat all warnings as errors.
- **ASSIMP_ASAN (default OFF)**: Enable AddressSanitizer.
- **ASSIMP_UBSAN (default OFF)**: Enable Undefined Behavior sanitizer.
- **ASSIMP_BUILD_DOCS (default OFF)**: Build documentation using Doxygen. OBSOLETE, see https://github.com/assimp/assimp-docs
- **ASSIMP_INJECT_DEBUG_POSTFIX (default ON)**: Inject debug postfix in .a/.so/.lib/.dll lib names
- **ASSIMP_IGNORE_GIT_HASH (default OFF)**: Don't call git to get the hash.
- **ASSIMP_INSTALL_PDB (default ON)**: Install MSVC debug files.
- **USE_STATIC_CRT (default OFF)**: Link against the static MSVC runtime libraries.
- **ASSIMP_BUILD_DRACO (default OFF)**: Build Draco libraries. Primarily for glTF.
- **ASSIMP_BUILD_ASSIMP_VIEW (default ON, if DirectX found, OFF otherwise)**: Build Assimp view tool (requires DirectX).
+- **BUILD_SHARED_LIBS ( default ON )**: Generation of shared libs ( dll for windows, so for Linux ). Set this to OFF to get a static lib.
+- **BUILD_FRAMEWORK ( default OFF, MacOnly)**: Build package as Mac OS X Framework bundle
+- **ASSIMP_DOUBLE_PRECISION( default OFF )**: All data will be stored as double values.
+- **ASSIMP_OPT_BUILD_PACKAGES ( default OFF)**: Set to ON to generate CPack configuration files and packaging targets
+- **ASSIMP_ANDROID_JNIIOSYSTEM ( default OFF )**: Android JNI IOSystem support is active
+- **ASSIMP_NO_EXPORT ( default OFF )**: Disable Assimp's export functionality
+- **ASSIMP_BUILD_ZLIB ( default OFF )**: Build your own zlib
+- **ASSIMP_BUILD_ASSIMP_TOOLS ( default ON )**: If the supplementary tools for Assimp are built in addition to the library.
+- **ASSIMP_BUILD_SAMPLES ( default OFF )**: If the official samples are built as well (needs Glut).
+- **ASSIMP_BUILD_TESTS ( default ON )**: If the test suite for Assimp is built in addition to the library.
+- **ASSIMP_COVERALLS ( default OFF )**: Enable this to measure test coverage.
+- **ASSIMP_ERROR_MAX( default OFF)**: Enable all warnings.
+- **ASSIMP_WERROR( default OFF )**: Treat warnings as errors.
+- **ASSIMP_ASAN ( default OFF )**: Enable AddressSanitizer.
+- **ASSIMP_UBSAN ( default OFF )**: Enable Undefined Behavior sanitizer.
+- **SYSTEM_IRRXML ( default OFF )**: Use system installed Irrlicht/IrrXML library.
+- **BUILD_DOCS ( default OFF )**: Build documentation using Doxygen.
+- **INJECT_DEBUG_POSTFIX( default ON )**: Inject debug postfix in .a/.so lib names
+- **IGNORE_GIT_HASH ( default OFF )**: Don't call git to get the hash.
+- **ASSIMP_INSTALL_PDB ( default ON )**: Install MSVC debug files.
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -1,6 +1,6 @@
 # Open Asset Import Library (assimp)
 # ----------------------------------------------------------------------
-# Copyright (c) 2006-2024, assimp team
+# Copyright (c) 2006-2021, assimp team
 #
 # All rights reserved.
 #
@ -38,40 +38,22 @@ SET(CMAKE_POLICY_DEFAULT_CMP0012 NEW)
 SET(CMAKE_POLICY_DEFAULT_CMP0074 NEW)
 SET(CMAKE_POLICY_DEFAULT_CMP0092 NEW)

-CMAKE_MINIMUM_REQUIRED( VERSION 3.22 )
+CMAKE_MINIMUM_REQUIRED( VERSION 3.10 )

-# Experimental USD importer: disabled, need to opt-in
-# Note: assimp github PR automatic checks will fail the PR due to compiler warnings in
-# the external, 3rd party tinyusdz code which isn't technically part of the PR since it's
-# auto-cloned during build; so MUST disable the feature or the PR will be rejected
-option(ASSIMP_BUILD_USD_IMPORTER "Enable USD file import" off)
-option(ASSIMP_BUILD_USD_VERBOSE_LOGS "Enable verbose USD import debug logging" off)
-option(ASSIMP_BUILD_USE_CCACHE "Use ccache to speed up compilation." on)
-
-if(ASSIMP_BUILD_USE_CCACHE)
-  find_program(CCACHE_PATH ccache)
-  if (CCACHE_PATH)
-    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_PATH})
-    set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE_PATH})
-  endif()
-endif()
-
-# Disabled importers: m3d for 5.1 or later
-ADD_DEFINITIONS( -DASSIMP_BUILD_NO_M3D_IMPORTER)
-ADD_DEFINITIONS( -DASSIMP_BUILD_NO_M3D_EXPORTER)
 # Toggles the use of the hunter package manager
 option(ASSIMP_HUNTER_ENABLED "Enable Hunter package manager support" OFF)

 IF(ASSIMP_HUNTER_ENABLED)
-  include("cmake-modules/HunterGate.cmake")
+  include("cmake/HunterGate.cmake")
  HunterGate(
-    URL "https://github.com/cpp-pm/hunter/archive/v0.25.5.tar.gz"
-    SHA1 "a20151e4c0740ee7d0f9994476856d813cdead29"
+    URL "https://github.com/cpp-pm/hunter/archive/v0.23.293.tar.gz"
+    SHA1 "e8e5470652db77149d9b38656db2a6c0b7642693"
  )
+
  add_definitions(-DASSIMP_USE_HUNTER)
 ENDIF()

-PROJECT(Assimp VERSION 5.4.3)
+PROJECT( Assimp VERSION 5.0.1 )

 # All supported options ###############################################

@ -99,9 +81,13 @@ OPTION( ASSIMP_NO_EXPORT
  "Disable Assimp's export functionality."
  OFF
 )
+OPTION( ASSIMP_BUILD_ZLIB
+  "Build your own zlib"
+  OFF
+)
 OPTION( ASSIMP_BUILD_ASSIMP_TOOLS
  "If the supplementary tools for Assimp are built in addition to the library."
-  OFF
+  ON
 )
 OPTION ( ASSIMP_BUILD_SAMPLES
  "If the official samples are built as well (needs Glut)."
@ -119,9 +105,9 @@ OPTION( ASSIMP_INSTALL
  "Disable this if you want to use assimp as a submodule."
  ON
 )
-OPTION ( ASSIMP_WARNINGS_AS_ERRORS
-  "Treat all warnings as errors."
-  ON
+OPTION ( ASSIMP_ERROR_MAX
+  "Enable all warnings."
+  OFF
 )
 OPTION ( ASSIMP_ASAN
  "Enable AddressSanitizer."
@ -145,45 +131,22 @@ OPTION ( ASSIMP_IGNORE_GIT_HASH
   OFF
 )

-IF (WIN32)
-  OPTION( ASSIMP_BUILD_ZLIB
-    "Build your zlib"
-    ON
-  )
-ELSE()
-  OPTION( ASSIMP_BUILD_ZLIB
-    "Build your zlib"
-    OFF
-  )
-ENDIF()
-
-IF (WIN32)
-  # Use a subset of Windows.h
+IF ( WIN32 )
+  # Use subset of Windows.h
  ADD_DEFINITIONS( -DWIN32_LEAN_AND_MEAN )

+  OPTION ( ASSIMP_BUILD_ASSIMP_VIEW
+    "If the Assimp view tool is built. (requires DirectX)"
+    OFF )
+
  IF(MSVC)
    OPTION( ASSIMP_INSTALL_PDB
-      "Create MSVC debug symbol files and add to Install target."
+      "Install MSVC debug files."
      ON )
    IF(NOT (MSVC_VERSION LESS 1900))
-      # Multibyte character set has been deprecated since at least MSVC2015 (possibly earlier)
+      # Multibyte character set is deprecated since at least MSVC2015 (possibly earlier)
      ADD_DEFINITIONS( -DUNICODE -D_UNICODE )
    ENDIF()
-
-    # Link statically against c/c++ lib to avoid missing redistributable such as
-    # "VCRUNTIME140.dll not found. Try reinstalling the app.", but give users
-    # a choice to opt for the shared runtime if they want.
-    option(USE_STATIC_CRT "Link against the static runtime libraries." OFF)
-
-    # The CMAKE_CXX_FLAGS vars can be overridden by some Visual Studio generators, so we use an alternative
-    # global method here:
-    if (${USE_STATIC_CRT})
-      add_compile_options(
-          $<$<CONFIG:>:/MT>
-          $<$<CONFIG:Debug>:/MTd>
-          $<$<CONFIG:Release>:/MT>
-      )
-    endif()
  ENDIF()
 ENDIF()

@ -203,7 +166,6 @@ ENDIF()
 IF(NOT BUILD_SHARED_LIBS)
  MESSAGE(STATUS "Shared libraries disabled")
  SET(LINK_SEARCH_START_STATIC TRUE)
-  SET(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_STATIC_LIBRARY_SUFFIX} ${CMAKE_FIND_LIBRARY_SUFFIXES})
 ELSE()
  MESSAGE(STATUS "Shared libraries enabled")
 ENDIF()
@ -216,9 +178,10 @@ SET (ASSIMP_VERSION ${ASSIMP_VERSION_MAJOR}.${ASSIMP_VERSION_MINOR}.${ASSIMP_VER
 SET (ASSIMP_SOVERSION 5)

 SET( ASSIMP_PACKAGE_VERSION "0" CACHE STRING "the package-specific version used for uploading the sources" )
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_C_STANDARD 99)
+if(NOT ASSIMP_HUNTER_ENABLED)
+  # Enable C++11 support globally
+  set_property( GLOBAL PROPERTY CXX_STANDARD 11 )
+endif()

 IF(NOT ASSIMP_IGNORE_GIT_HASH)
  # Get the current working branch
@ -248,6 +211,16 @@ IF(ASSIMP_DOUBLE_PRECISION)
  ADD_DEFINITIONS(-DASSIMP_DOUBLE_PRECISION)
 ENDIF()

+CONFIGURE_FILE(
+  ${CMAKE_CURRENT_LIST_DIR}/revision.h.in
+  ${CMAKE_CURRENT_BINARY_DIR}/revision.h
+)
+
+CONFIGURE_FILE(
+  ${CMAKE_CURRENT_LIST_DIR}/include/assimp/config.h.in
+  ${CMAKE_CURRENT_BINARY_DIR}/include/assimp/config.h
+)
+
 INCLUDE_DIRECTORIES( BEFORE
  ./
  code/
@ -265,24 +238,14 @@ SET(ASSIMP_LIBRARY_SUFFIX "" CACHE STRING "Suffix to append to library names")
 IF( UNIX )
  # Use GNUInstallDirs for Unix predefined directories
  INCLUDE(GNUInstallDirs)
-  # Ensure that we do not run into issues like http://www.tcm.phy.cam.ac.uk/sw/inodes64.html on 32 bit Linux
-  IF(NOT ${OPERATING_SYSTEM} MATCHES "Android")
-    IF ( CMAKE_SIZEOF_VOID_P EQUAL 4) # only necessary for 32-bit Linux
-      ADD_DEFINITIONS(-D_FILE_OFFSET_BITS=64 )
-    ENDIF()
-  ENDIF()
 ENDIF()

 # Grouped compiler settings ########################################
-IF ((CMAKE_C_COMPILER_ID MATCHES "GNU") AND NOT MINGW AND NOT HAIKU)
+IF ((CMAKE_C_COMPILER_ID MATCHES "GNU") AND NOT CMAKE_COMPILER_IS_MINGW)
  IF(NOT ASSIMP_HUNTER_ENABLED)
+    SET(CMAKE_CXX_STANDARD 11)
    SET(CMAKE_POSITION_INDEPENDENT_CODE ON)
  ENDIF()
-
-  IF(CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 13)
-    MESSAGE(STATUS "GCC13 detected disabling \"-Wdangling-reference\" in Cpp files as it appears to be a false positive")
-    ADD_COMPILE_OPTIONS("$<$<COMPILE_LANGUAGE:CXX>:-Wno-dangling-reference>")
-  ENDIF()
  # hide all not-exported symbols
  IF(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "mips64" )
 	SET(CMAKE_CXX_FLAGS "-mxgot -fvisibility=hidden -fno-strict-aliasing -Wall ${CMAKE_CXX_FLAGS}")
@ -296,49 +259,35 @@ IF ((CMAKE_C_COMPILER_ID MATCHES "GNU") AND NOT MINGW AND NOT HAIKU)
 ELSEIF(MSVC)
  # enable multi-core compilation with MSVC
  IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang" ) # clang-cl
-    ADD_COMPILE_OPTIONS(/bigobj)
+    ADD_COMPILE_OPTIONS(/bigobj /W4 /WX )
  ELSE() # msvc
-    ADD_COMPILE_OPTIONS(/MP /bigobj)
+    ADD_COMPILE_OPTIONS(/MP /bigobj /W4 /WX)
  ENDIF()
-
  # disable "elements of array '' will be default initialized" warning on MSVC2013
  IF(MSVC12)
    ADD_COMPILE_OPTIONS(/wd4351)
  ENDIF()
-  # supress warning for double to float conversion if Double precision is activated
-  ADD_COMPILE_OPTIONS(/wd4244)
  SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /D_DEBUG /Zi /Od")
-  # Allow user to disable PDBs
-  if(ASSIMP_INSTALL_PDB)
-    SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi")
-    SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /DEBUG:FULL /PDBALTPATH:%_PDB% /OPT:REF /OPT:ICF")
-  elseif((GENERATOR_IS_MULTI_CONFIG) OR (CMAKE_BUILD_TYPE MATCHES Release))
-    message("-- MSVC PDB generation disabled. Release binary will not be debuggable.")
-  endif()
-  # Source code is encoded in UTF-8
-  ADD_COMPILE_OPTIONS(/source-charset:utf-8)
 ELSEIF (CMAKE_CXX_COMPILER_ID MATCHES "Clang" )
  IF(NOT ASSIMP_HUNTER_ENABLED)
+    SET(CMAKE_CXX_STANDARD 11)
    SET(CMAKE_POSITION_INDEPENDENT_CODE ON)
  ENDIF()
  SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wall -Wno-long-long ${CMAKE_CXX_FLAGS}" )
  SET(CMAKE_C_FLAGS "-fno-strict-aliasing ${CMAKE_C_FLAGS}")
-ELSEIF( MINGW )
+ELSEIF( CMAKE_COMPILER_IS_MINGW )
  IF (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0)
    message(FATAL_ERROR "MinGW is too old to be supported. Please update MinGW and try again.")
  ELSEIF(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.3)
    message(WARNING "MinGW is old, if you experience errors, update MinGW.")
  ENDIF()
  IF(NOT ASSIMP_HUNTER_ENABLED)
-    SET(CMAKE_CXX_FLAGS "-std=gnu++17 ${CMAKE_CXX_FLAGS}")
+    SET(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
    SET(CMAKE_C_FLAGS "-fPIC ${CMAKE_C_FLAGS}")
  ENDIF()
-    IF (CMAKE_BUILD_TYPE STREQUAL "Debug")
-      SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wno-dangling-reference -Wall -Wno-long-long -Wa,-mbig-obj -g ${CMAKE_CXX_FLAGS}")
-    ELSE()
-      SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wno-dangling-reference -Wall -Wno-long-long -Wa,-mbig-obj -O3 ${CMAKE_CXX_FLAGS}")
-    ENDIF()
+  SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wall -Wno-long-long -Wa,-mbig-obj -O3 ${CMAKE_CXX_FLAGS}")
  SET(CMAKE_C_FLAGS "-fno-strict-aliasing ${CMAKE_C_FLAGS}")
+  ADD_DEFINITIONS( -U__STRICT_ANSI__ )
 ENDIF()

 IF ( IOS AND NOT ASSIMP_HUNTER_ENABLED)
@ -348,27 +297,35 @@ IF ( IOS AND NOT ASSIMP_HUNTER_ENABLED)
  ELSE()
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fembed-bitcode -O3")
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fembed-bitcode -O3")
+    # Experimental for pdb generation
  ENDIF()
 ENDIF()

 IF (ASSIMP_COVERALLS)
  MESSAGE(STATUS "Coveralls enabled")
-
  INCLUDE(Coveralls)
  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O0 -fprofile-arcs -ftest-coverage")
  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 -fprofile-arcs -ftest-coverage")
 ENDIF()

+IF (ASSIMP_ERROR_MAX)
+  MESSAGE(STATUS "Turning on all warnings")
+  IF (MSVC)
+    ADD_COMPILE_OPTIONS(/W4) # NB: there is a /Wall option, pedantic mode
+  ELSE()
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
+  ENDIF()
+ENDIF()
+
 IF (ASSIMP_ASAN)
  MESSAGE(STATUS "AddressSanitizer enabled")
-
  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address")
 ENDIF()

 IF (ASSIMP_UBSAN)
  MESSAGE(STATUS "Undefined Behavior sanitizer enabled")
-
  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined,shift,shift-exponent,integer-divide-by-zero,unreachable,vla-bound,null,return,signed-integer-overflow,bounds,float-divide-by-zero,float-cast-overflow,nonnull-attribute,returns-nonnull-attribute,bool,enum,vptr,pointer-overflow,builtin -fno-sanitize-recover=all")
  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=undefined,shift,shift-exponent,integer-divide-by-zero,unreachable,vla-bound,null,return,signed-integer-overflow,bounds,float-divide-by-zero,float-cast-overflow,nonnull-attribute,returns-nonnull-attribute,bool,enum,vptr,pointer-overflow,builtin -fno-sanitize-recover=all")
 ENDIF()
@ -377,24 +334,9 @@ INCLUDE (FindPkgMacros)
 INCLUDE (PrecompiledHeader)

 # Set Assimp project output directory variables.
-# Will respect top-level CMAKE_*_OUTPUT_DIRECTORY variables if any are set.
-IF(NOT DEFINED CMAKE_RUNTIME_OUTPUT_DIRECTORY)
-  SET(ASSIMP_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin" CACHE STRING "Path for runtime output files")
-ELSE()
-  SET(ASSIMP_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY} CACHE STRING "Path for runtime output files")
-ENDIF()
-
-IF(NOT DEFINED CMAKE_LIBRARY_OUTPUT_DIRECTORY)
-  SET(ASSIMP_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin" CACHE STRING "Path for library output files")
-ELSE()
-  SET(ASSIMP_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_LIBRARY_OUTPUT_DIRECTORY} CACHE STRING "Path for runtime output files")
-ENDIF()
-
-IF(NOT DEFINED CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
-  SET(ASSIMP_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/lib" CACHE STRING "Path for library output files")
-ELSE()
-  SET(ASSIMP_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY} CACHE STRING "Path for runtime output files")
-ENDIF()
+SET(ASSIMP_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
+SET(ASSIMP_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
+SET(ASSIMP_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/lib")

 # Macro used to set the output directories of a target to the
 # respective Assimp output directories.
@ -421,6 +363,13 @@ IF (NOT TARGET uninstall AND ASSIMP_INSTALL)
  ADD_CUSTOM_TARGET(uninstall "${CMAKE_COMMAND}" -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake")
 ENDIF()

+# cmake configuration files
+if(${BUILD_SHARED_LIBS})
+  set(BUILD_LIB_TYPE SHARED)
+else()
+  set(BUILD_LIB_TYPE STATIC)
+endif()
+
 IF( UNIX )
  # Use GNUInstallDirs for Unix predefined directories
  INCLUDE(GNUInstallDirs)
@ -446,14 +395,14 @@ set(GENERATED_DIR "${CMAKE_CURRENT_BINARY_DIR}/generated")

 IF(ASSIMP_HUNTER_ENABLED)
  set(CONFIG_INSTALL_DIR "lib/cmake/${PROJECT_NAME}")
-  set(CMAKE_CONFIG_TEMPLATE_FILE "cmake-modules/assimp-hunter-config.cmake.in")
+  set(CMAKE_CONFIG_TEMPLATE_FILE "cmake/assimp-hunter-config.cmake.in")
  set(NAMESPACE "${PROJECT_NAME}::")
  set(TARGETS_EXPORT_NAME "${PROJECT_NAME}Targets")
  set(VERSION_CONFIG "${GENERATED_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
  set(PROJECT_CONFIG "${GENERATED_DIR}/${PROJECT_NAME}Config.cmake")
 ELSE()
  set(CONFIG_INSTALL_DIR "${ASSIMP_LIB_INSTALL_DIR}/cmake/assimp-${ASSIMP_VERSION_MAJOR}.${ASSIMP_VERSION_MINOR}")
-  set(CMAKE_CONFIG_TEMPLATE_FILE "cmake-modules/assimp-plain-config.cmake.in")
+  set(CMAKE_CONFIG_TEMPLATE_FILE "cmake/assimp-plain-config.cmake.in")
  string(TOLOWER ${PROJECT_NAME} PROJECT_NAME_LOWERCASE)
  set(NAMESPACE "${PROJECT_NAME_LOWERCASE}::")
  set(TARGETS_EXPORT_NAME "${PROJECT_NAME_LOWERCASE}Targets")
@ -475,20 +424,18 @@ configure_package_config_file(
    INSTALL_DESTINATION "${CONFIG_INSTALL_DIR}"
 )

-if(ASSIMP_INSTALL)
-  install(
+install(
    FILES "${PROJECT_CONFIG}" "${VERSION_CONFIG}"
    DESTINATION "${CONFIG_INSTALL_DIR}"
    COMPONENT ${LIBASSIMP-DEV_COMPONENT}
-  )
+)

-  install(
+install(
    EXPORT "${TARGETS_EXPORT_NAME}"
    NAMESPACE "${NAMESPACE}"
    DESTINATION "${CONFIG_INSTALL_DIR}"
    COMPONENT ${LIBASSIMP-DEV_COMPONENT}
-  )
-endif()
+)

 IF( ASSIMP_BUILD_DOCS )
  ADD_SUBDIRECTORY(doc)
@ -506,7 +453,7 @@ IF(ASSIMP_HUNTER_ENABLED)
  set(ASSIMP_BUILD_MINIZIP TRUE)
 ELSE()
  # If the zlib is already found outside, add an export in case assimpTargets can't find it.
-  IF( ZLIB_FOUND AND ASSIMP_INSTALL)
+  IF( ZLIB_FOUND )
    INSTALL( TARGETS zlib zlibstatic
        EXPORT "${TARGETS_EXPORT_NAME}")
  ENDIF()
@ -515,11 +462,7 @@ ELSE()
    FIND_PACKAGE(ZLIB)
  ENDIF()

-  IF ( NOT ZLIB_FOUND AND NOT ASSIMP_BUILD_ZLIB )
-    message( FATAL_ERROR
-      "Build configured with -DASSIMP_BUILD_ZLIB=OFF but unable to find zlib"
-    )
-  ELSEIF( NOT ZLIB_FOUND )
+  IF( NOT ZLIB_FOUND )
    MESSAGE(STATUS "compiling zlib from sources")
    INCLUDE(CheckIncludeFile)
    INCLUDE(CheckTypeSize)
@ -588,15 +531,11 @@ SET ( ASSIMP_BUILD_NONFREE_C4D_IMPORTER OFF CACHE BOOL
 )

 IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
+  IF ( MSVC )
    SET(C4D_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/contrib/Cineware/includes")

-  IF (WIN32)
    # pick the correct prebuilt library
-    IF(MSVC143)
-      SET(C4D_LIB_POSTFIX "_2022")
-    ELSEIF(MSV142)
-      SET(C4D_LIB_POSTFIX "_2019")
-    ELSEIF(MSVC15)
+    IF(MSVC15)
      SET(C4D_LIB_POSTFIX "_2017")
    ELSEIF(MSVC14)
      SET(C4D_LIB_POSTFIX "_2015")
@ -608,7 +547,7 @@ IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
      SET(C4D_LIB_POSTFIX "_2010")
    ELSE()
      MESSAGE( FATAL_ERROR
-        "C4D for Windows is currently only supported with MSVC 10, 11, 12, 14, 14.2, 14.3"
+        "C4D is currently only supported with MSVC 10, 11, 12, 14"
      )
    ENDIF()

@ -626,30 +565,15 @@ IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
    # winsock and winmm are necessary (and undocumented) dependencies of Cineware SDK because
    # it can be used to communicate with a running Cinema 4D instance
    SET(C4D_EXTRA_LIBRARIES WSock32.lib Winmm.lib)
-  ELSEIF (APPLE)
-    SET(C4D_LIB_BASE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/contrib/Cineware/libraries/osx")
-
-    SET(C4D_DEBUG_LIBRARIES
-      "${C4D_LIB_BASE_PATH}/debug/libcinewarelib.a"
-      "${C4D_LIB_BASE_PATH}/debug/libjpeglib.a"
-    )
-    SET(C4D_RELEASE_LIBRARIES
-      "${C4D_LIB_BASE_PATH}/release/libcinewarelib.a"
-      "${C4D_LIB_BASE_PATH}/release/libjpeglib.a"
-    )
  ELSE ()
    MESSAGE( FATAL_ERROR
-      "C4D is currently only available on Windows and macOS with Cineware SDK installed in contrib/Cineware"
+      "C4D is currently only available on Windows with Cineware SDK installed in contrib/Cineware"
    )
  ENDIF ()
 ELSE ()
  ADD_DEFINITIONS( -DASSIMP_BUILD_NO_C4D_IMPORTER )
 ENDIF ()

-if(ASSIMP_BUILD_DRACO_STATIC)
-  set(ASSIMP_BUILD_DRACO ON)
-endif()
-
 # Draco requires cmake 3.12
 IF (DEFINED CMAKE_VERSION AND "${CMAKE_VERSION}" VERSION_LESS "3.12")
  message(NOTICE "draco requires cmake 3.12 or newer, cmake is ${CMAKE_VERSION} . Draco is disabled")
@ -659,7 +583,7 @@ ELSE()
  IF ( ASSIMP_BUILD_DRACO )
    # Primarily for glTF v2
    # Enable Draco glTF feature set
-    set(DRACO_GLTF_BITSTREAM ON CACHE BOOL "" FORCE)
+    set(DRACO_GLTF ON CACHE BOOL "" FORCE)
    # Disable unnecessary or omitted components
    set(DRACO_JS_GLUE OFF CACHE BOOL "" FORCE)
    set(DRACO_WASM OFF CACHE BOOL "" FORCE)
@ -685,29 +609,22 @@ ELSE()
          "-Wno-sign-compare"
          "-Wno-unused-local-typedefs"
        )
-
-        if(NOT ASSIMP_BUILD_DRACO_STATIC)
        # Draco 1.4.1 does not explicitly export any symbols under GCC/clang
        list(APPEND DRACO_CXX_FLAGS
          "-fvisibility=default"
        )
-        endif()
      ENDIF()

      # Don't build or install all of Draco by default
      ADD_SUBDIRECTORY( "contrib/draco" EXCLUDE_FROM_ALL )

-      if(ASSIMP_BUILD_DRACO_STATIC)
-        set_property(DIRECTORY "contrib/draco" PROPERTY BUILD_SHARED_LIBS OFF)
-      endif()
-
      if(MSVC OR WIN32)
        set(draco_LIBRARIES "draco")
      else()
-        if(ASSIMP_BUILD_DRACO_STATIC)
-          set(draco_LIBRARIES "draco_static")
-        else()
+        if(BUILD_SHARED_LIBS)
          set(draco_LIBRARIES "draco_shared")
+        else()
+          set(draco_LIBRARIES "draco_static")
        endif()
      endif()

@ -730,7 +647,6 @@ ELSE()
      set(draco_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/draco/src")

      # This is probably wrong
-      if (ASSIMP_INSTALL)
      INSTALL( TARGETS ${draco_LIBRARIES}
        EXPORT "${TARGETS_EXPORT_NAME}"
        LIBRARY DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
@ -740,24 +656,20 @@ ELSE()
        COMPONENT ${LIBASSIMP_COMPONENT}
        INCLUDES DESTINATION include
    )
-      endif()
+
    ENDIF()
  ENDIF()
 ENDIF()

 # Main assimp code
 ADD_SUBDIRECTORY( code/ )
-
 IF ( ASSIMP_BUILD_ASSIMP_TOOLS )
  # The viewer for windows only
-  IF (WIN32)
-    FIND_PACKAGE(DirectX)
-    OPTION ( ASSIMP_BUILD_ASSIMP_VIEW "If the Assimp view tool is built. (requires DirectX)" ${DirectX_FOUND} )
+  IF ( WIN32 )
+    OPTION ( ASSIMP_BUILD_ASSIMP_VIEW "If the Assimp view tool is built. (requires DirectX)" OFF )
    IF ( ASSIMP_BUILD_ASSIMP_VIEW )
      ADD_SUBDIRECTORY( tools/assimp_view/ )
    ENDIF ()
-  ELSE()
-    MESSAGE("Building Assimp Viewer only supported on Windows.")
  ENDIF ()
  # The command line tool
  ADD_SUBDIRECTORY( tools/assimp_cmd/ )
@ -777,22 +689,12 @@ IF ( ASSIMP_BUILD_TESTS )
  ADD_SUBDIRECTORY( test/ )
 ENDIF ()

-# Generate a pkg-config .pc, revision.h, and config.h for the Assimp library.
+# Generate a pkg-config .pc for the Assimp library.
 CONFIGURE_FILE( "${PROJECT_SOURCE_DIR}/assimp.pc.in" "${PROJECT_BINARY_DIR}/assimp.pc" @ONLY )
 IF ( ASSIMP_INSTALL )
  INSTALL( FILES "${PROJECT_BINARY_DIR}/assimp.pc" DESTINATION ${ASSIMP_LIB_INSTALL_DIR}/pkgconfig/ COMPONENT ${LIBASSIMP-DEV_COMPONENT})
 ENDIF()

-CONFIGURE_FILE(
-  ${CMAKE_CURRENT_LIST_DIR}/include/assimp/revision.h.in
-  ${CMAKE_CURRENT_BINARY_DIR}/include/assimp/revision.h
-)
-
-CONFIGURE_FILE(
-  ${CMAKE_CURRENT_LIST_DIR}/include/assimp/config.h.in
-  ${CMAKE_CURRENT_BINARY_DIR}/include/assimp/config.h
-)
-
 IF ( ASSIMP_INSTALL )
  IF(CMAKE_CPACK_COMMAND AND UNIX AND ASSIMP_OPT_BUILD_PACKAGES)
    # Packing information
@ -826,7 +728,7 @@ IF ( ASSIMP_INSTALL )
    SET(CPACK_DEBIAN_PACKAGE_SECTION  "libs" )
    SET(CPACK_DEBIAN_PACKAGE_DEPENDS  "${CPACK_COMPONENTS_ALL}")
    SET(CPACK_DEBIAN_PACKAGE_SUGGESTS)
-    SET(CPACK_DEBIAN_PACKAGE_NAME     "assimp")
+    SET(cPACK_DEBIAN_PACKAGE_NAME     "assimp")
    SET(CPACK_DEBIAN_PACKAGE_REMOVE_SOURCE_FILES contrib/gtest contrib/zlib workspaces test doc obj samples packaging)
    SET(CPACK_DEBIAN_PACKAGE_SOURCE_COPY svn export --force)
    SET(CPACK_DEBIAN_CHANGELOG)
@ -855,7 +757,7 @@ if(WIN32)

  IF(MSVC_TOOLSET_VERSION)
    SET(MSVC_PREFIX "vc${MSVC_TOOLSET_VERSION}")
-    SET(ASSIMP_MSVC_VERSION ${MSVC_PREFIX})
+    SET(ASSIMP_MSVC_VERSION ${MCVS_PREFIX})
  ELSE()
    IF(MSVC12)
      SET(ASSIMP_MSVC_VERSION "vc120")
@ -863,10 +765,6 @@ if(WIN32)
      SET(ASSIMP_MSVC_VERSION "vc140")
    ELSEIF(MSVC15)
      SET(ASSIMP_MSVC_VERSION "vc141")
-    ELSEIF(MSV142)
-      SET(ASSIMP_MSVC_VERSION "vc142")
-    ELSEIF(MSVC143)
-      SET(ASSIMP_MSVC_VERSION "vc143")
    ENDIF()
  ENDIF()

--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@ -1,128 +0,0 @@
-# Contributor Covenant Code of Conduct
-
-## Our Pledge
-
-We as members, contributors, and leaders pledge to make participation in our
-community a harassment-free experience for everyone, regardless of age, body
-size, visible or invisible disability, ethnicity, sex characteristics, gender
-identity and expression, level of experience, education, socio-economic status,
-nationality, personal appearance, race, religion, or sexual identity
-and orientation.
-
-We pledge to act and interact in ways that contribute to an open, welcoming,
-diverse, inclusive, and healthy community.
-
-## Our Standards
-
-Examples of behavior that contributes to a positive environment for our
-community include:
-
-* Demonstrating empathy and kindness toward other people
-* Being respectful of differing opinions, viewpoints, and experiences
-* Giving and gracefully accepting constructive feedback
-* Accepting responsibility and apologizing to those affected by our mistakes,
-  and learning from the experience
-* Focusing on what is best not just for us as individuals, but for the
-  overall community
-
-Examples of unacceptable behavior include:
-
-* The use of sexualized language or imagery, and sexual attention or
-  advances of any kind
-* Trolling, insulting or derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or email
-  address, without their explicit permission
-* Other conduct which could reasonably be considered inappropriate in a
-  professional setting
-
-## Enforcement Responsibilities
-
-Community leaders are responsible for clarifying and enforcing our standards of
-acceptable behavior and will take appropriate and fair corrective action in
-response to any behavior that they deem inappropriate, threatening, offensive,
-or harmful.
-
-Community leaders have the right and responsibility to remove, edit, or reject
-comments, commits, code, wiki edits, issues, and other contributions that are
-not aligned to this Code of Conduct, and will communicate reasons for moderation
-decisions when appropriate.
-
-## Scope
-
-This Code of Conduct applies within all community spaces, and also applies when
-an individual is officially representing the community in public spaces.
-Examples of representing our community include using an official e-mail address,
-posting via an official social media account, or acting as an appointed
-representative at an online or offline event.
-
-## Enforcement
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported to the community leaders responsible for enforcement at
-.
-All complaints will be reviewed and investigated promptly and fairly.
-
-All community leaders are obligated to respect the privacy and security of the
-reporter of any incident.
-
-## Enforcement Guidelines
-
-Community leaders will follow these Community Impact Guidelines in determining
-the consequences for any action they deem in violation of this Code of Conduct:
-
-### 1. Correction
-
-**Community Impact**: Use of inappropriate language or other behavior deemed
-unprofessional or unwelcome in the community.
-
-**Consequence**: A private, written warning from community leaders, providing
-clarity around the nature of the violation and an explanation of why the
-behavior was inappropriate. A public apology may be requested.
-
-### 2. Warning
-
-**Community Impact**: A violation through a single incident or series
-of actions.
-
-**Consequence**: A warning with consequences for continued behavior. No
-interaction with the people involved, including unsolicited interaction with
-those enforcing the Code of Conduct, for a specified period of time. This
-includes avoiding interactions in community spaces as well as external channels
-like social media. Violating these terms may lead to a temporary or
-permanent ban.
-
-### 3. Temporary Ban
-
-**Community Impact**: A serious violation of community standards, including
-sustained inappropriate behavior.
-
-**Consequence**: A temporary ban from any sort of interaction or public
-communication with the community for a specified period of time. No public or
-private interaction with the people involved, including unsolicited interaction
-with those enforcing the Code of Conduct, is allowed during this period.
-Violating these terms may lead to a permanent ban.
-
-### 4. Permanent Ban
-
-**Community Impact**: Demonstrating a pattern of violation of community
-standards, including sustained inappropriate behavior,  harassment of an
-individual, or aggression toward or disparagement of classes of individuals.
-
-**Consequence**: A permanent ban from any sort of public interaction within
-the community.
-
-## Attribution
-
-This Code of Conduct is adapted from the [Contributor Covenant][homepage],
-version 2.0, available at
-https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
-
-Community Impact Guidelines were inspired by [Mozilla's code of conduct
-enforcement ladder](https://github.com/mozilla/diversity).
-
-[homepage]: https://www.contributor-covenant.org
-
-For answers to common questions about this code of conduct, see the FAQ at
-https://www.contributor-covenant.org/faq. Translations are available at
-https://www.contributor-covenant.org/translations.
--- a/17
+++ b/17
@ -1,12 +1,16 @@
-FROM ubuntu:22.04
+FROM ubuntu:14.04

-RUN apt-get update && apt-get install --no-install-recommends -y ninja-build \
+RUN apt-get update && apt-get install -y \
    git cmake build-essential software-properties-common

-RUN add-apt-repository ppa:ubuntu-toolchain-r/test && apt-get update 
+RUN add-apt-repository ppa:ubuntu-toolchain-r/test && apt-get update && apt-get install -y gcc-4.9 g++-4.9 && \
+    cd /usr/bin && \
+    rm gcc g++ cpp && \
+    ln -s gcc-4.9 gcc && \
+    ln -s g++-4.9 g++ && \
+    ln -s cpp-4.9 cpp

 WORKDIR /opt
-RUN apt install zlib1g-dev

 # Build Assimp
 RUN git clone https://github.com/assimp/assimp.git /opt/assimp
@ -15,8 +19,7 @@ WORKDIR /opt/assimp

 RUN git checkout master \
    && mkdir build && cd build && \
-    cmake -G 'Ninja' \
+    cmake \
    -DCMAKE_BUILD_TYPE=Release \
-    -DASSIMP_BUILD_ASSIMP_TOOLS=ON \
    .. && \
-    ninja -j4 && ninja install
+    make && make install
--- a/2
+++ b/2
@ -14,4 +14,4 @@ https://assimp-docs.readthedocs.io/en/latest/
 Building Assimp 
 ------------------------------

-Just check the build-instructions which you can find here: https://github.com/assimp/assimp/blob/master/Build.md
+Just check the build-instaructions which you can find here: https://github.com/assimp/assimp/blob/master/Build.md
--- a/1
+++ b/1
@ -0,0 +1 @@
+See Readme.md
--- a/Readme.md
+++ b/Readme.md
@ -1,41 +1,40 @@
 Open Asset Import Library (assimp)
 ==================================
-
-Open Asset Import Library is a library to load various 3d file formats into a shared, in-memory format. It supports more than __40 file formats__ for import and a growing selection of file formats for export.
-
+A library to import and export various 3d-model-formats including scene-post-processing to generate missing render data.
 ### Current project status ###
 [![Financial Contributors on Open Collective](https://opencollective.com/assimp/all/badge.svg?label=financial+contributors)](https://opencollective.com/assimp) 
 ![C/C++ CI](https://github.com/assimp/assimp/workflows/C/C++%20CI/badge.svg)
+<a href="https://scan.coverity.com/projects/5607">
+  <img alt="Coverity Scan Build Status"
+       src="https://scan.coverity.com/projects/5607/badge.svg"/>
+</a>
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/9973693b7bdd4543b07084d5d9cf4745)](https://www.codacy.com/gh/assimp/assimp/dashboard?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=assimp/assimp&amp;utm_campaign=Badge_Grade)
+[![Coverage Status](https://coveralls.io/repos/github/assimp/assimp/badge.svg?branch=master)](https://coveralls.io/github/assimp/assimp?branch=master)
 [![Join the chat at https://gitter.im/assimp/assimp](https://badges.gitter.im/assimp/assimp.svg)](https://gitter.im/assimp/assimp?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/assimp/assimp.svg)](http://isitmaintained.com/project/assimp/assimp "Average time to resolve an issue")
-[![Percentage of issues still open](http://isitmaintained.com/badge/open/assimp/assimp.svg)](http://isitmaintained.com/project/assimp/assimp "Percentage of issues still open")
+[![Total alerts](https://img.shields.io/lgtm/alerts/g/assimp/assimp.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/assimp/assimp/alerts/)
 <br>

 APIs are provided for C and C++. There are various bindings to other languages (C#, Java, Python, Delphi, D). Assimp also runs on Android and iOS.
-Additionally, assimp features various __mesh post-processing tools__: normals and tangent space generation, triangulation, vertex cache locality optimization, removal of degenerate primitives and duplicate vertices, sorting by primitive type, merging of redundant materials and many more.
+Additionally, assimp features various __mesh post processing tools__: normals and tangent space generation, triangulation, vertex cache locality optimization, removal of degenerate primitives and duplicate vertices, sorting by primitive type, merging of redundant materials and many more.

-### Documentation ###
-Read [our latest documentation](https://assimp-docs.readthedocs.io/en/latest/).
+### Latest Doc's ###
+Please check the latest documents at [Asset-Importer-Lib-Doc](https://assimp-docs.readthedocs.io/en/latest/). 

-### Pre-built binaries ###
-Download binaries from [our Itchi Projectspace](https://kimkulling.itch.io/the-asset-importer-lib).
+### Get involved ###
+This is the development repo containing the latest features and bugfixes. For productive use though, we recommend one of the stable releases available from [Github Assimp Releases](https://github.com/assimp/assimp/releases).
+<br>
+You find a bug in the docs? Use [Doc-Repo](https://github.com/assimp/assimp-docs).
+<br>
+Please check our Wiki as well: https://github.com/assimp/assimp/wiki

-### Test data ###
-Clone [our model database](https://github.com/assimp/assimp-mdb).
-
-### Communities ###
- Ask questions at [the Assimp Discussion Board](https://github.com/assimp/assimp/discussions).
- Find us on [https://discord.gg/s9KJfaem](https://discord.gg/kKazXMXDy2)
- Ask [the Assimp community on Reddit](https://www.reddit.com/r/Assimp/).
- Ask on [StackOverflow with the assimp-tag](http://stackoverflow.com/questions/tagged/assimp?sort=newest). 
- Nothing has worked? File a question or an issue-report at [The Assimp-Issue Tracker](https://github.com/assimp/assimp/issues)
+If you want to check our Model-Database, use the following repo: https://github.com/assimp/assimp-mdb

 #### Supported file formats ####
-See [the complete list of supported formats](https://github.com/assimp/assimp/blob/master/doc/Fileformats.md).
+You can find the complete list of supported file-formats [here](https://github.com/assimp/assimp/blob/master/doc/Fileformats.md)

 ### Building ###
-Start by reading [our build instructions](https://github.com/assimp/assimp/blob/master/Build.md). We are available in vcpkg, and our build system is CMake; if you used CMake before there is a good chance you know what to do.
+Take a look into the https://github.com/assimp/assimp/blob/master/Build.md file. We are available in vcpkg, and our build system is CMake; if you used CMake before there is a good chance you know what to do.

 ### Ports ###
 * [Android](port/AndroidJNI/README.md)
@ -43,40 +42,43 @@ Start by reading [our build instructions](https://github.com/assimp/assimp/blob/
 * [.NET](https://bitbucket.org/Starnick/assimpnet/src/master/)
 * [Pascal](port/AssimpPascal/Readme.md)
 * [Javascript (Alpha)](https://github.com/makc/assimp2json)
-* [Javascript/Node.js Interface](https://github.com/kovacsv/assimpjs)
-* [Unity 3d Plugin](https://ricardoreis.net/trilib-2/)
-* [Unreal Engine Plugin](https://github.com/irajsb/UE4_Assimp/)
+* [Unity 3d Plugin](https://www.assetstore.unity3d.com/en/#!/content/91777)
 * [JVM](https://github.com/kotlin-graphics/assimp) Full jvm port (current [status](https://github.com/kotlin-graphics/assimp/wiki/Status))
 * [HAXE-Port](https://github.com/longde123/assimp-haxe) The Assimp-HAXE-port.
 * [Rust](https://github.com/jkvargas/russimp)

 ### Other tools ###
 [open3mod](https://github.com/acgessler/open3mod) is a powerful 3D model viewer based on Assimp's import and export abilities.
-[Assimp-Viewer](https://github.com/assimp/assimp_view) is an experimental implementation for an Asset-Viewer based on ImGUI and Assimp (experimental).

 #### Repository structure ####
-Open Asset Import Library is implemented in C++. The directory structure looks like this:
+Open Asset Import Library is implemented in C++. The directory structure looks like:

 	/code		Source code
 	/contrib	Third-party libraries
 	/doc		Documentation (doxysource and pre-compiled docs)
-	/fuzz           Contains the test code for the Google Fuzzer project
 	/include	Public header C and C++ header files
-	/scripts 	Scripts are used to generate the loading code for some formats
+	/scripts 	Scripts used to generate the loading code for some formats
 	/port		Ports to other languages and scripts to maintain those.
 	/test		Unit- and regression tests, test suite of models
 	/tools		Tools (old assimp viewer, command line `assimp`)
-	/samples	A small number of samples to illustrate possible use cases for Assimp
+	/samples	A small number of samples to illustrate possible
+                        use cases for Assimp

 The source code is organized in the following way:

 	code/Common			The base implementation for importers and the infrastructure
-	code/CApi                       Special implementations which are only used for the C-API
-	code/Geometry                   A collection of geometry tools
-	code/Material                   The material system
-	code/PBR                        An exporter for physical-based models
 	code/PostProcessing		The post-processing steps
-	code/AssetLib/<FormatName>	Implementation for import and export of the format
+	code/AssetLib/<FormatName>	Implementation for import and export for the format
+
+### Where to get help ###
+For more information, visit [our website](http://assimp.org/). Or check out the `./doc`- folder, which contains the official documentation in HTML format.
+(CHMs for Windows are included in some release packages and should be located right here in the root folder).
+
+If the docs don't solve your problem, ask on [StackOverflow with the assimp-tag](http://stackoverflow.com/questions/tagged/assimp?sort=newest). If you think you found a bug, please open an issue on Github.
+
+Open Asset Import Library is a library to load various 3d file formats into a shared, in-memory format. It supports more than __40 file formats__ for import and a growing selection of file formats for export.
+
+And we also have a Gitter-channel:Gitter [![Join the chat at https://gitter.im/assimp/assimp](https://badges.gitter.im/assimp/assimp.svg)](https://gitter.im/assimp/assimp?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)<br>

 ### Contributing ###
 Contributions to assimp are highly appreciated. The easiest way to get involved is to submit
@ -113,4 +115,4 @@ and don't sue us if our code doesn't work. Note that, unlike LGPLed code, you ma
 For the legal details, see the `LICENSE` file.

 ### Why this name ###
-Sorry, we're germans :-), no English native speakers ...
+Sorry, we're germans :-), no english native speakers ...
--- a/SECURITY.md
+++ b/SECURITY.md
@ -1,16 +0,0 @@
-# Security Policy
-
-## Supported Versions
-
-Use this section to tell people about which versions of your project are
-currently being supported with security updates.
-
-| Version | Supported          |
-| ------- | ------------------ |
-| 5.2.4   | :white_check_mark: |
-
-## Reporting a Vulnerability
-
-If you have found any security vulnerability you can contact us via 
-kim.kulling@googlemail.com
-
--- a/cmake-modules/FindDirectX.cmake
+++ b/cmake-modules/FindDirectX.cmake
@ -55,7 +55,7 @@ if(WIN32) # The only platform it makes sense to check for DirectX SDK
  endif(CMAKE_CL_64)
  find_library(DirectX_LIBRARY NAMES d3d9 HINTS ${DirectX_LIB_SEARCH_PATH} PATH_SUFFIXES ${DirectX_LIBPATH_SUFFIX})
  find_library(DirectX_D3DX9_LIBRARY NAMES d3dx9 HINTS ${DirectX_LIB_SEARCH_PATH} PATH_SUFFIXES ${DirectX_LIBPATH_SUFFIX})
-  find_library(DirectX_DXERR_LIBRARY NAMES DxErr DxErr9 HINTS ${DirectX_LIB_SEARCH_PATH} PATH_SUFFIXES ${DirectX_LIBPATH_SUFFIX})
+  find_library(DirectX_DXERR_LIBRARY NAMES DxErr HINTS ${DirectX_LIB_SEARCH_PATH} PATH_SUFFIXES ${DirectX_LIBPATH_SUFFIX})
  find_library(DirectX_DXGUID_LIBRARY NAMES dxguid HINTS ${DirectX_LIB_SEARCH_PATH} PATH_SUFFIXES ${DirectX_LIBPATH_SUFFIX})


--- a/cmake-modules/FindIrrXML.cmake
+++ b/cmake-modules/FindIrrXML.cmake
@ -0,0 +1,17 @@
+# Find IrrXMl from irrlicht project
+#
+# Find LibIrrXML headers and library
+#
+#   IRRXML_FOUND          - IrrXML found
+#   IRRXML_INCLUDE_DIR    - Headers location
+#   IRRXML_LIBRARY        - IrrXML main library
+
+find_path(IRRXML_INCLUDE_DIR irrXML.h
+    PATH_SUFFIXES include/irrlicht include/irrxml)
+find_library(IRRXML_LIBRARY IrrXML)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(IrrXML REQUIRED_VARS IRRXML_INCLUDE_DIR IRRXML_LIBRARY)
+
+
+mark_as_advanced(IRRXML_INCLUDE_DIR IRRXML_LIBRARY)
--- a/cmake-modules/FindPkgMacros.cmake
+++ b/cmake-modules/FindPkgMacros.cmake
@ -54,7 +54,7 @@ macro(clear_if_changed TESTVAR)
      set(${var} "NOTFOUND" CACHE STRING "x" FORCE)
    endforeach(var)
  endif ()
-  set(${TESTVAR}_INT_CHECK "${${TESTVAR}}" CACHE INTERNAL "x" FORCE)
+  set(${TESTVAR}_INT_CHECK ${${TESTVAR}} CACHE INTERNAL "x" FORCE)
 endmacro(clear_if_changed)

 # Try to get some hints from pkg-config, if available
--- a/cmake-modules/assimp-hunter-config.cmake.in
+++ b/cmake-modules/assimp-hunter-config.cmake.in
@ -1,19 +0,0 @@
-@PACKAGE_INIT@
-
-find_package(RapidJSON     CONFIG REQUIRED)
-find_package(ZLIB          CONFIG REQUIRED)
-find_package(utf8cpp       CONFIG REQUIRED)
-find_package(minizip       CONFIG REQUIRED)
-find_package(openddlparser CONFIG REQUIRED)
-find_package(poly2tri      CONFIG REQUIRED)
-find_package(polyclipping  CONFIG REQUIRED)
-find_package(zip           CONFIG REQUIRED)
-find_package(pugixml       CONFIG REQUIRED)
-find_package(stb           CONFIG REQUIRED)
-
-if(@ASSIMP_BUILD_DRACO@)
-  find_package(draco CONFIG REQUIRED)
-endif()
-
-include("${CMAKE_CURRENT_LIST_DIR}/@TARGETS_EXPORT_NAME@.cmake")
-check_required_components("@PROJECT_NAME@")
--- a/cmake-modules/HunterGate.cmake
+++ b/cmake-modules/HunterGate.cmake
@ -22,9 +22,38 @@
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+# This is a gate file to Hunter package manager.
+# Include this file using `include` command and add package you need, example:
+#
+#     cmake_minimum_required(VERSION 3.2)
+#
+#     include("cmake/HunterGate.cmake")
+#     HunterGate(
+#         URL "https://github.com/path/to/hunter/archive.tar.gz"
+#         SHA1 "798501e983f14b28b10cda16afa4de69eee1da1d"
+#     )
+#
+#     project(MyProject)
+#
+#     hunter_add_package(Foo)
+#     hunter_add_package(Boo COMPONENTS Bar Baz)
+#
+# Projects:
+#     * https://github.com/hunter-packages/gate/
+#     * https://github.com/ruslo/hunter

 option(HUNTER_ENABLED "Enable Hunter package manager support" ON)

+if(HUNTER_ENABLED)
+  if(CMAKE_VERSION VERSION_LESS "3.2")
+    message(
+        FATAL_ERROR
+        "At least CMake version 3.2 required for Hunter dependency management."
+        " Update CMake or set HUNTER_ENABLED to OFF."
+    )
+  endif()
+endif()
+
 include(CMakeParseArguments) # cmake_parse_arguments

 option(HUNTER_STATUS_PRINT "Print working status" ON)
--- a/cmake/assimp-hunter-config.cmake.in
+++ b/cmake/assimp-hunter-config.cmake.in
@ -0,0 +1,18 @@
+@PACKAGE_INIT@
+
+find_package(RapidJSON CONFIG REQUIRED)
+find_package(ZLIB CONFIG REQUIRED)
+find_package(utf8cpp CONFIG REQUIRED)
+find_package(minizip CONFIG REQUIRED)
+find_package(openddlparser CONFIG REQUIRED)
+find_package(poly2tri CONFIG REQUIRED)
+find_package(polyclipping CONFIG REQUIRED)
+find_package(zip CONFIG REQUIRED)
+find_package(pugixml CONFIG REQUIRED)
+
+if(@ASSIMP_BUILD_DRACO@)
+  find_package(draco CONFIG REQUIRED)
+endif()
+
+include("${CMAKE_CURRENT_LIST_DIR}/@TARGETS_EXPORT_NAME@.cmake")
+check_required_components("@PROJECT_NAME@")
--- a/cmake-modules/assimp-plain-config.cmake.in
+++ b/cmake-modules/assimp-plain-config.cmake.in
--- a/code/AssetLib/3DS/3DSConverter.cpp
+++ b/code/AssetLib/3DS/3DSConverter.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -52,9 +52,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <cctype>
 #include <memory>

-namespace Assimp {
+using namespace Assimp;

-static constexpr unsigned int NotSet = 0xcdcdcdcd;
+static const unsigned int NotSet = 0xcdcdcdcd;

 // ------------------------------------------------------------------------------------------------
 // Setup final material indices, generae a default material if necessary
@ -68,8 +68,8 @@ void Discreet3DSImporter::ReplaceDefaultMaterial() {
    unsigned int idx(NotSet);
    for (unsigned int i = 0; i < mScene->mMaterials.size(); ++i) {
        std::string s = mScene->mMaterials[i].mName;
-        for (char &it : s) {
-            it = static_cast<char>(::tolower(static_cast<unsigned char>(it)));
+        for (std::string::iterator it = s.begin(); it != s.end(); ++it) {
+            *it = static_cast<char>(::tolower(static_cast<unsigned char>(*it)));
        }

        if (std::string::npos == s.find("default")) continue;
@ -79,7 +79,12 @@ void Discreet3DSImporter::ReplaceDefaultMaterial() {
                mScene->mMaterials[i].mDiffuse.r !=
                        mScene->mMaterials[i].mDiffuse.b) continue;

-        if (ContainsTextures(i)) {
+        if (mScene->mMaterials[i].sTexDiffuse.mMapName.length() != 0 ||
+                mScene->mMaterials[i].sTexBump.mMapName.length() != 0 ||
+                mScene->mMaterials[i].sTexOpacity.mMapName.length() != 0 ||
+                mScene->mMaterials[i].sTexEmissive.mMapName.length() != 0 ||
+                mScene->mMaterials[i].sTexSpecular.mMapName.length() != 0 ||
+                mScene->mMaterials[i].sTexShininess.mMapName.length() != 0) {
            continue;
        }
        idx = i;
@ -262,7 +267,6 @@ void Discreet3DSImporter::ConvertMaterial(D3DS::Material &oldMat,
        unsigned int iWire = 1;
        mat.AddProperty<int>((int *)&iWire, 1, AI_MATKEY_ENABLE_WIREFRAME);
    }
-        [[fallthrough]];

    case D3DS::Discreet3DS::Gouraud:
        eShading = aiShadingMode_Gouraud;
@ -593,7 +597,7 @@ void Discreet3DSImporter::AddNodeToGraph(aiScene *pcSOut, aiNode *pcOut,

        // Cameras or lights define their transformation in their parent node and in the
        // corresponding light or camera chunks. However, we read and process the latter
-        // to be able to return valid cameras/lights even if no scenegraph is given.
+        // to to be able to return valid cameras/lights even if no scenegraph is given.
        for (unsigned int n = 0; n < pcSOut->mNumCameras; ++n) {
            if (pcSOut->mCameras[n]->mName == pcOut->mName) {
                pcSOut->mCameras[n]->mLookAt = aiVector3D(0.f, 0.f, 1.f);
@ -643,17 +647,11 @@ void Discreet3DSImporter::AddNodeToGraph(aiScene *pcSOut, aiNode *pcOut,
    }

    // Allocate storage for children
-    const unsigned int size = static_cast<unsigned int>(pcIn->mChildren.size());
-
-    pcOut->mNumChildren = size;
-    if (size == 0) {
-        return;
-    }
-
+    pcOut->mNumChildren = (unsigned int)pcIn->mChildren.size();
    pcOut->mChildren = new aiNode *[pcIn->mChildren.size()];

    // Recursively process all children
-    
+    const unsigned int size = static_cast<unsigned int>(pcIn->mChildren.size());
    for (unsigned int i = 0; i < size; ++i) {
        pcOut->mChildren[i] = new aiNode();
        pcOut->mChildren[i]->mParent = pcOut;
@ -715,7 +713,7 @@ void Discreet3DSImporter::GenerateNodeGraph(aiScene *pcOut) {
            pcNode->mNumMeshes = 1;

            // Build a name for the node
-            pcNode->mName.length = ai_snprintf(pcNode->mName.data, AI_MAXLEN, "3DSMesh_%u", i);
+            pcNode->mName.length = ai_snprintf(pcNode->mName.data, MAXLEN, "3DSMesh_%u", i);
        }

        // Build dummy nodes for all cameras
@ -811,6 +809,4 @@ void Discreet3DSImporter::ConvertScene(aiScene *pcOut) {
    }
 }

-} // namespace Assimp
-
 #endif // !! ASSIMP_BUILD_NO_3DS_IMPORTER
--- a/code/AssetLib/3DS/3DSExporter.cpp
+++ b/code/AssetLib/3DS/3DSExporter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -52,13 +52,12 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/StringComparison.h>
 #include <assimp/DefaultLogger.hpp>
 #include <assimp/Exporter.hpp>
-#include <assimp/Exceptional.h>
 #include <assimp/IOSystem.hpp>

 #include <memory>

+using namespace Assimp;
 namespace Assimp {
-
 using namespace D3DS;

 namespace {
@ -210,7 +209,9 @@ Discreet3DSExporter::Discreet3DSExporter(std::shared_ptr<IOStream> &outfile, con
 }

 // ------------------------------------------------------------------------------------------------
-Discreet3DSExporter::~Discreet3DSExporter() = default;
+Discreet3DSExporter::~Discreet3DSExporter() {
+    // empty
+}

 // ------------------------------------------------------------------------------------------------
 int Discreet3DSExporter::WriteHierarchy(const aiNode &node, int seq, int sibling_level) {
@ -329,7 +330,6 @@ void Discreet3DSExporter::WriteMaterials() {
            case aiShadingMode_Blinn:
            case aiShadingMode_CookTorrance:
            case aiShadingMode_Fresnel:
-            case aiShadingMode_PBR_BRDF: // Possibly should be Discreet3DS::Metal in some cases but this is undocumented
                shading_mode_out = Discreet3DS::Phong;
                break;

@ -356,10 +356,7 @@ void Discreet3DSExporter::WriteMaterials() {
            writer.PutI2(1);
        }

-        // Fallback to BASE_COLOR if no DIFFUSE
-        if (!WriteTexture(mat, aiTextureType_DIFFUSE, Discreet3DS::CHUNK_MAT_TEXTURE))
-            WriteTexture(mat, aiTextureType_BASE_COLOR, Discreet3DS::CHUNK_MAT_TEXTURE);
-
+        WriteTexture(mat, aiTextureType_DIFFUSE, Discreet3DS::CHUNK_MAT_TEXTURE);
        WriteTexture(mat, aiTextureType_HEIGHT, Discreet3DS::CHUNK_MAT_BUMPMAP);
        WriteTexture(mat, aiTextureType_OPACITY, Discreet3DS::CHUNK_MAT_OPACMAP);
        WriteTexture(mat, aiTextureType_SHININESS, Discreet3DS::CHUNK_MAT_MAT_SHINMAP);
@ -370,21 +367,20 @@ void Discreet3DSExporter::WriteMaterials() {
 }

 // ------------------------------------------------------------------------------------------------
-// returns true if the texture existed
-bool Discreet3DSExporter::WriteTexture(const aiMaterial &mat, aiTextureType type, uint16_t chunk_flags) {
+void Discreet3DSExporter::WriteTexture(const aiMaterial &mat, aiTextureType type, uint16_t chunk_flags) {
    aiString path;
    aiTextureMapMode map_mode[2] = {
        aiTextureMapMode_Wrap, aiTextureMapMode_Wrap
    };
    ai_real blend = 1.0;
    if (mat.GetTexture(type, 0, &path, nullptr, nullptr, &blend, nullptr, map_mode) != AI_SUCCESS || !path.length) {
-        return false;
+        return;
    }

    // TODO: handle embedded textures properly
    if (path.data[0] == '*') {
        ASSIMP_LOG_ERROR("Ignoring embedded texture for export: ", path.C_Str());
-        return false;
+        return;
    }

    ChunkWriter chunk(writer, chunk_flags);
@ -406,7 +402,6 @@ bool Discreet3DSExporter::WriteTexture(const aiMaterial &mat, aiTextureType type
        writer.PutU2(val);
    }
    // TODO: export texture transformation (i.e. UV offset, scale, rotation)
-    return true;
 }

 // ------------------------------------------------------------------------------------------------
--- a/code/AssetLib/3DS/3DSExporter.h
+++ b/code/AssetLib/3DS/3DSExporter.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -56,7 +57,8 @@ struct aiNode;
 struct aiMaterial;
 struct aiMesh;

-namespace Assimp {
+namespace Assimp
+{

 // ------------------------------------------------------------------------------------------------
 /**
@ -71,7 +73,7 @@ public:
 private:
    void WriteMeshes();
    void WriteMaterials();
-    bool WriteTexture(const aiMaterial& mat, aiTextureType type, uint16_t chunk_flags);
+    void WriteTexture(const aiMaterial& mat, aiTextureType type, uint16_t chunk_flags);
    void WriteFaceMaterialChunk(const aiMesh& mesh);
    int WriteHierarchy(const aiNode& node, int level, int sibling_level);
    void WriteString(const std::string& s);
@ -86,7 +88,7 @@ private:

    std::map<const aiNode*, aiMatrix4x4> trafos;

-    using MeshesByNodeMap = std::multimap<const aiNode*, unsigned int>;
+    typedef std::multimap<const aiNode*, unsigned int> MeshesByNodeMap;
    MeshesByNodeMap meshes;

 };
--- a/code/AssetLib/3DS/3DSHelper.h
+++ b/code/AssetLib/3DS/3DSHelper.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -53,7 +53,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/light.h>
 #include <assimp/material.h>
 #include <assimp/qnan.h>
-#include <cstdio> //sprintf
+#include <stdio.h> //sprintf

 namespace Assimp {
 namespace D3DS {
@ -259,7 +259,7 @@ namespace Discreet3DS {
        // Specifies the file name of a texture
        CHUNK_MAPFILE = 0xA300,

-        // Specifies whether a material requires two-sided rendering
+        // Specifies whether a materail requires two-sided rendering
        CHUNK_MAT_TWO_SIDE = 0xA081,
        // ********************************************************************

@ -322,6 +322,7 @@ struct Texture {
    //! Default constructor
    Texture() AI_NO_EXCEPT
            : mTextureBlend(0.0f),
+              mMapName(),
              mOffsetU(0.0),
              mOffsetV(0.0),
              mScaleU(1.0),
@ -333,11 +334,51 @@ struct Texture {
        mTextureBlend = get_qnan();
    }

-    Texture(const Texture &other) = default;
+    Texture(const Texture &other) :
+            mTextureBlend(other.mTextureBlend),
+            mMapName(other.mMapName),
+            mOffsetU(other.mOffsetU),
+            mOffsetV(other.mOffsetV),
+            mScaleU(other.mScaleU),
+            mScaleV(other.mScaleV),
+            mRotation(other.mRotation),
+            mMapMode(other.mMapMode),
+            bPrivate(other.bPrivate),
+            iUVSrc(other.iUVSrc) {
+        // empty
+    }

-    Texture(Texture &&other) AI_NO_EXCEPT = default;
+    Texture(Texture &&other) AI_NO_EXCEPT : mTextureBlend(std::move(other.mTextureBlend)),
+                                            mMapName(std::move(other.mMapName)),
+                                            mOffsetU(std::move(other.mOffsetU)),
+                                            mOffsetV(std::move(other.mOffsetV)),
+                                            mScaleU(std::move(other.mScaleU)),
+                                            mScaleV(std::move(other.mScaleV)),
+                                            mRotation(std::move(other.mRotation)),
+                                            mMapMode(std::move(other.mMapMode)),
+                                            bPrivate(std::move(other.bPrivate)),
+                                            iUVSrc(std::move(other.iUVSrc)) {
+        // empty
+    }

-    Texture &operator=(Texture &&other) AI_NO_EXCEPT = default;
+    Texture &operator=(Texture &&other) AI_NO_EXCEPT {
+        if (this == &other) {
+            return *this;
+        }
+
+        mTextureBlend = std::move(other.mTextureBlend);
+        mMapName = std::move(other.mMapName);
+        mOffsetU = std::move(other.mOffsetU);
+        mOffsetV = std::move(other.mOffsetV);
+        mScaleU = std::move(other.mScaleU);
+        mScaleV = std::move(other.mScaleV);
+        mRotation = std::move(other.mRotation);
+        mMapMode = std::move(other.mMapMode);
+        bPrivate = std::move(other.bPrivate);
+        iUVSrc = std::move(other.iUVSrc);
+
+        return *this;
+    }

    //! Specifies the blend factor for the texture
    ai_real mTextureBlend;
@ -365,13 +406,14 @@ struct Texture {
 #ifdef _MSC_VER
 #pragma warning(pop)
 #endif // _MSC_VER
+
 // ---------------------------------------------------------------------------
 /** Helper structure representing a 3ds material */
 struct Material {
    //! Default constructor has been deleted
    Material() :
            mName(),
-            mDiffuse(0.6f, 0.6f, 0.6f),
+            mDiffuse(ai_real(0.6), ai_real(0.6), ai_real(0.6)),
            mSpecularExponent(ai_real(0.0)),
            mShininessStrength(ai_real(1.0)),
            mShading(Discreet3DS::Gouraud),
@ -384,7 +426,7 @@ struct Material {
    //! Constructor with explicit name
    explicit Material(const std::string &name) :
            mName(name),
-            mDiffuse(0.6f, 0.6f, 0.6f),
+            mDiffuse(ai_real(0.6), ai_real(0.6), ai_real(0.6)),
            mSpecularExponent(ai_real(0.0)),
            mShininessStrength(ai_real(1.0)),
            mShading(Discreet3DS::Gouraud),
@ -394,9 +436,83 @@ struct Material {
        // empty
    }

-    Material(const Material &other) = default;
+    Material(const Material &other) :
+            mName(other.mName),
+            mDiffuse(other.mDiffuse),
+            mSpecularExponent(other.mSpecularExponent),
+            mShininessStrength(other.mShininessStrength),
+            mSpecular(other.mSpecular),
+            mAmbient(other.mAmbient),
+            mShading(other.mShading),
+            mTransparency(other.mTransparency),
+            sTexDiffuse(other.sTexDiffuse),
+            sTexOpacity(other.sTexOpacity),
+            sTexSpecular(other.sTexSpecular),
+            sTexReflective(other.sTexReflective),
+            sTexBump(other.sTexBump),
+            sTexEmissive(other.sTexEmissive),
+            sTexShininess(other.sTexShininess),
+            mBumpHeight(other.mBumpHeight),
+            mEmissive(other.mEmissive),
+            sTexAmbient(other.sTexAmbient),
+            mTwoSided(other.mTwoSided) {
+        // empty
+    }

-    virtual ~Material() = default;
+    //! Move constructor. This is explicitly written because MSVC doesn't support defaulting it
+    Material(Material &&other) AI_NO_EXCEPT : mName(std::move(other.mName)),
+                                              mDiffuse(std::move(other.mDiffuse)),
+                                              mSpecularExponent(std::move(other.mSpecularExponent)),
+                                              mShininessStrength(std::move(other.mShininessStrength)),
+                                              mSpecular(std::move(other.mSpecular)),
+                                              mAmbient(std::move(other.mAmbient)),
+                                              mShading(std::move(other.mShading)),
+                                              mTransparency(std::move(other.mTransparency)),
+                                              sTexDiffuse(std::move(other.sTexDiffuse)),
+                                              sTexOpacity(std::move(other.sTexOpacity)),
+                                              sTexSpecular(std::move(other.sTexSpecular)),
+                                              sTexReflective(std::move(other.sTexReflective)),
+                                              sTexBump(std::move(other.sTexBump)),
+                                              sTexEmissive(std::move(other.sTexEmissive)),
+                                              sTexShininess(std::move(other.sTexShininess)),
+                                              mBumpHeight(std::move(other.mBumpHeight)),
+                                              mEmissive(std::move(other.mEmissive)),
+                                              sTexAmbient(std::move(other.sTexAmbient)),
+                                              mTwoSided(std::move(other.mTwoSided)) {
+        // empty
+    }
+
+    Material &operator=(Material &&other) AI_NO_EXCEPT {
+        if (this == &other) {
+            return *this;
+        }
+
+        mName = std::move(other.mName);
+        mDiffuse = std::move(other.mDiffuse);
+        mSpecularExponent = std::move(other.mSpecularExponent);
+        mShininessStrength = std::move(other.mShininessStrength),
+        mSpecular = std::move(other.mSpecular);
+        mAmbient = std::move(other.mAmbient);
+        mShading = std::move(other.mShading);
+        mTransparency = std::move(other.mTransparency);
+        sTexDiffuse = std::move(other.sTexDiffuse);
+        sTexOpacity = std::move(other.sTexOpacity);
+        sTexSpecular = std::move(other.sTexSpecular);
+        sTexReflective = std::move(other.sTexReflective);
+        sTexBump = std::move(other.sTexBump);
+        sTexEmissive = std::move(other.sTexEmissive);
+        sTexShininess = std::move(other.sTexShininess);
+        mBumpHeight = std::move(other.mBumpHeight);
+        mEmissive = std::move(other.mEmissive);
+        sTexAmbient = std::move(other.sTexAmbient);
+        mTwoSided = std::move(other.mTwoSided);
+
+        return *this;
+    }
+
+    virtual ~Material() {
+        // empty
+    }

    //! Name of the material
    std::string mName;
--- a/code/AssetLib/3DS/3DSLoader.cpp
+++ b/code/AssetLib/3DS/3DSLoader.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -54,9 +54,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/DefaultLogger.hpp>
 #include <assimp/IOSystem.hpp>

-namespace Assimp {
+using namespace Assimp;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "Discreet 3DS Importer",
    "",
    "",
@ -103,11 +103,28 @@ Discreet3DSImporter::Discreet3DSImporter() :
    // empty
 }

+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+Discreet3DSImporter::~Discreet3DSImporter() {
+    // empty
+}
+
 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool Discreet3DSImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
-    static const uint16_t token[] = { 0x4d4d, 0x3dc2 /*, 0x3daa */ };
-    return CheckMagicToken(pIOHandler, pFile, token, AI_COUNT_OF(token), 0, sizeof token[0]);
+bool Discreet3DSImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const {
+    std::string extension = GetExtension(pFile);
+    if (extension == "3ds" || extension == "prj") {
+        return true;
+    }
+
+    if (!extension.length() || checkSig) {
+        uint16_t token[3];
+        token[0] = 0x4d4d;
+        token[1] = 0x3dc2;
+        //token[2] = 0x3daa;
+        return CheckMagicToken(pIOHandler, pFile, token, 2, 0, 2);
+    }
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -262,15 +279,8 @@ void Discreet3DSImporter::ParseMainChunk() {
    };

    ASSIMP_3DS_END_CHUNK();
-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunreachable-code-return"
-#endif
    // recursively continue processing this hierarchy level
    return ParseMainChunk();
-#if defined(__clang__)
-#pragma clang diagnostic pop
-#endif
 }

 // ------------------------------------------------------------------------------------------------
@ -320,7 +330,7 @@ void Discreet3DSImporter::ParseObjectChunk() {
    case Discreet3DS::CHUNK_MAT_MATERIAL:

        // Add a new material to the list
-        mScene->mMaterials.emplace_back(std::string("UNNAMED_" + ai_to_string(mScene->mMaterials.size())));
+        mScene->mMaterials.push_back(D3DS::Material(std::string("UNNAMED_" + ai_to_string(mScene->mMaterials.size()))));
        ParseMaterialChunk();
        break;

@ -365,13 +375,13 @@ void Discreet3DSImporter::ParseChunk(const char *name, unsigned int num) {
    // IMPLEMENTATION NOTE;
    // Cameras or lights define their transformation in their parent node and in the
    // corresponding light or camera chunks. However, we read and process the latter
-    // to be able to return valid cameras/lights even if no scenegraph is given.
+    // to to be able to return valid cameras/lights even if no scenegraph is given.

    // get chunk type
    switch (chunk.Flag) {
    case Discreet3DS::CHUNK_TRIMESH: {
        // this starts a new triangle mesh
-        mScene->mMeshes.emplace_back(std::string(name, num));
+        mScene->mMeshes.push_back(D3DS::Mesh(std::string(name, num)));

        // Read mesh chunks
        ParseMeshChunk();
@ -439,7 +449,7 @@ void Discreet3DSImporter::ParseChunk(const char *name, unsigned int num) {
        // Read the lense angle
        camera->mHorizontalFOV = AI_DEG_TO_RAD(stream->GetF4());
        if (camera->mHorizontalFOV < 0.001f) {
-            camera->mHorizontalFOV = float(AI_DEG_TO_RAD(45.f));
+            camera->mHorizontalFOV = AI_DEG_TO_RAD(45.f);
        }

        // Now check for further subchunks
@ -1000,7 +1010,7 @@ void Discreet3DSImporter::ParseMeshChunk() {
        mMesh.mFaces.reserve(num);
        while (num-- > 0) {
            // 3DS faces are ALWAYS triangles
-            mMesh.mFaces.emplace_back();
+            mMesh.mFaces.push_back(D3DS::Face());
            D3DS::Face &sFace = mMesh.mFaces.back();

            sFace.mIndices[0] = (uint16_t)stream->GetI2();
@ -1285,7 +1295,7 @@ void Discreet3DSImporter::ParseColorChunk(aiColor3D *out, bool acceptPercent) {
    switch (chunk.Flag) {
    case Discreet3DS::CHUNK_LINRGBF:
        bGamma = true;
-    // fallthrough
+
    case Discreet3DS::CHUNK_RGBF:
        if (sizeof(float) * 3 > diff) {
            *out = clrError;
@ -1298,7 +1308,6 @@ void Discreet3DSImporter::ParseColorChunk(aiColor3D *out, bool acceptPercent) {

    case Discreet3DS::CHUNK_LINRGBB:
        bGamma = true;
-            // fallthrough
    case Discreet3DS::CHUNK_RGBB: {
        if (sizeof(char) * 3 > diff) {
            *out = clrError;
@ -1335,6 +1344,4 @@ void Discreet3DSImporter::ParseColorChunk(aiColor3D *out, bool acceptPercent) {
    (void)bGamma;
 }

-} // namespace Assimp
-
 #endif // !! ASSIMP_BUILD_NO_3DS_IMPORTER
--- a/code/AssetLib/3DS/3DSLoader.h
+++ b/code/AssetLib/3DS/3DSLoader.h
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -46,11 +46,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 #ifndef AI_3DSIMPORTER_H_INC
 #define AI_3DSIMPORTER_H_INC
-#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER

 #include <assimp/BaseImporter.h>
 #include <assimp/types.h>

+#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER

 #include "3DSHelper.h"
 #include <assimp/StreamReader.h>
@ -59,6 +59,7 @@ struct aiNode;

 namespace Assimp    {

+
 using namespace D3DS;

 // ---------------------------------------------------------------------------------
@ -67,21 +68,21 @@ using namespace D3DS;
 class Discreet3DSImporter : public BaseImporter {
 public:
    Discreet3DSImporter();
-    ~Discreet3DSImporter() override = default;
+    ~Discreet3DSImporter();

    // -------------------------------------------------------------------
    /** Returns whether the class can handle the format of the given file.
     * See BaseImporter::CanRead() for details.
     */
    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
-        bool checkSig) const override;
+        bool checkSig) const;

    // -------------------------------------------------------------------
    /** Called prior to ReadFile().
     * The function is a request to the importer to update its configuration
     * basing on the Importer's configuration property list.
     */
-    void SetupProperties(const Importer* pImp) override;
+    void SetupProperties(const Importer* pImp);

 protected:

@ -89,14 +90,14 @@ protected:
    /** Return importer meta information.
     * See #BaseImporter::GetInfo for the details
     */
-    const aiImporterDesc* GetInfo () const override;
+    const aiImporterDesc* GetInfo () const;

    // -------------------------------------------------------------------
    /** Imports the given file into the given scene structure.
     * See BaseImporter::InternReadFile() for details
     */
    void InternReadFile( const std::string& pFile, aiScene* pScene,
-        IOSystem* pIOHandler) override;
+        IOSystem* pIOHandler);

    // -------------------------------------------------------------------
    /** Converts a temporary material to the outer representation
@ -207,15 +208,6 @@ protected:
    */
    void ReplaceDefaultMaterial();

-    bool ContainsTextures(unsigned int i) const {
-        return !mScene->mMaterials[i].sTexDiffuse.mMapName.empty() ||
-               !mScene->mMaterials[i].sTexBump.mMapName.empty() ||
-               !mScene->mMaterials[i].sTexOpacity.mMapName.empty() ||
-               !mScene->mMaterials[i].sTexEmissive.mMapName.empty() ||
-               !mScene->mMaterials[i].sTexSpecular.mMapName.empty() ||
-               !mScene->mMaterials[i].sTexShininess.mMapName.empty() ;
-    }
-
    // -------------------------------------------------------------------
    /** Convert the whole scene
    */
--- a/code/AssetLib/3MF/3MFTypes.h
+++ b/code/AssetLib/3MF/3MFTypes.h
@ -1,179 +0,0 @@
-/*
-Open Asset Import Library (assimp)
----------------------------------------------------------------------
-
-Copyright (c) 2006-2024, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
----------------------------------------------------------------------
-*/
-#pragma once
-
-#include <assimp/vector3.h>
-#include <assimp/matrix4x4.h>
-#include <assimp/ParsingUtils.h>
-#include <vector>
-#include <string>
-
-struct aiMaterial;
-struct aiMesh;
-
-namespace Assimp {
-namespace D3MF {
-
-enum class ResourceType {
-    RT_Object,
-    RT_BaseMaterials,
-    RT_EmbeddedTexture2D,
-    RT_Texture2DGroup,
-    RT_ColorGroup,
-    RT_Unknown
-}; // To be extended with other resource types (eg. material extension resources like Texture2d, Texture2dGroup...)
-
-class Resource {
-public:
-    int mId;
-
-    Resource(int id) :
-            mId(id) {
-        // empty
-    }
-
-    virtual ~Resource() = default;
-
-    virtual ResourceType getType() const {
-        return ResourceType::RT_Unknown;
-    }
-};
-
-class EmbeddedTexture : public Resource {
-public:
-    std::string mPath;
-    std::string mContentType;
-    std::string mTilestyleU;
-    std::string mTilestyleV;
-    std::vector<char> mBuffer;
-
-    EmbeddedTexture(int id) :
-            Resource(id),
-            mPath(),
-            mContentType(),
-            mTilestyleU(),
-            mTilestyleV() {
-        // empty
-    }
-
-    ~EmbeddedTexture() override = default;
-
-    ResourceType getType() const override {
-        return ResourceType::RT_EmbeddedTexture2D;
-    }
-};
-
-class Texture2DGroup : public Resource {
-public:
-    std::vector<aiVector2D> mTex2dCoords;
-    int mTexId;
-    Texture2DGroup(int id) :
-            Resource(id),
-            mTexId(-1) {
-        // empty
-    }
-
-    ~Texture2DGroup() override = default;
-
-    ResourceType getType() const override {
-        return ResourceType::RT_Texture2DGroup;
-    }
-};
-
-class ColorGroup : public Resource {
-public:
-    std::vector<aiColor4D> mColors;
-    ColorGroup(int id) :
-            Resource(id){
-        // empty
-    }
-
-    ~ColorGroup() override = default;
-
-    ResourceType getType() const override {
-        return ResourceType::RT_ColorGroup;
-    }
-};
-
-class BaseMaterials : public Resource {
-public:
-    std::vector<unsigned int> mMaterialIndex;
-
-    BaseMaterials(int id) :
-            Resource(id),
-            mMaterialIndex() {
-        // empty
-    }
-
-    ~BaseMaterials() override = default;
-
-    ResourceType getType() const override {
-        return ResourceType::RT_BaseMaterials;
-    }
-};
-
-struct Component {
-    int mObjectId;
-    aiMatrix4x4 mTransformation;
-};
-
-class Object : public Resource {
-public:
-    std::vector<aiMesh *> mMeshes;
-    std::vector<unsigned int> mMeshIndex;
-    std::vector<Component> mComponents;
-    std::string mName;
-
-    Object(int id) :
-            Resource(id),
-            mName(std::string("Object_") + ai_to_string(id)) {
-        // empty
-    }
-
-    ~Object() override = default;
-
-    ResourceType getType() const override {
-        return ResourceType::RT_Object;
-    }
-};
-
-} // namespace D3MF
-} // namespace Assimp
--- a/code/AssetLib/3MF/3MFXmlTags.h
+++ b/code/AssetLib/3MF/3MFXmlTags.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -74,34 +74,19 @@ namespace XmlTag {
    const char* const pid = "pid";
    const char* const pindex = "pindex";
    const char* const p1 = "p1";
-    const char *const p2 = "p2";
-    const char *const p3 = "p3";
    const char* const name = "name";
    const char* const type = "type";
    const char* const build = "build";
    const char* const item = "item";
    const char* const objectid = "objectid";
    const char* const transform = "transform";
-    const char *const path = "path";

    // Material definitions
    const char* const basematerials = "basematerials";
+    const char* const basematerials_id = "id";
    const char* const basematerials_base = "base";
    const char* const basematerials_name = "name";
    const char* const basematerials_displaycolor = "displaycolor";
-    const char* const texture_2d = "m:texture2d";
-    const char *const texture_group = "m:texture2dgroup";
-    const char *const texture_content_type = "contenttype";
-    const char *const texture_tilestyleu = "tilestyleu";
-    const char *const texture_tilestylev = "tilestylev";
-    const char *const texture_2d_coord = "m:tex2coord";
-    const char *const texture_cuurd_u = "u";
-    const char *const texture_cuurd_v = "v";
-
-    // vertex color definitions
-    const char *const colorgroup = "m:colorgroup";
-    const char *const color_item = "m:color";
-    const char *const color_vaule = "color";

    // Meta info tags
    const char* const CONTENT_TYPES_ARCHIVE = "[Content_Types].xml";
@ -118,7 +103,7 @@ namespace XmlTag {
    const char* const PACKAGE_TEXTURE_RELATIONSHIP_TYPE = "http://schemas.microsoft.com/3dmanufacturing/2013/01/3dtexture";
    const char* const PACKAGE_CORE_PROPERTIES_RELATIONSHIP_TYPE = "http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties";
    const char* const PACKAGE_THUMBNAIL_RELATIONSHIP_TYPE = "http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail";
-}
+    }

 } // Namespace D3MF
 } // Namespace Assimp
--- a/code/AssetLib/3MF/D3MFExporter.cpp
+++ b/code/AssetLib/3MF/D3MFExporter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -83,7 +83,7 @@ void ExportScene3MF(const char *pFile, IOSystem *pIOSystem, const aiScene *pScen
 namespace D3MF {

 D3MFExporter::D3MFExporter(const char *pFile, const aiScene *pScene) :
-        mArchiveName(pFile), m_zipArchive(nullptr), mScene(pScene) {
+        mArchiveName(pFile), m_zipArchive(nullptr), mScene(pScene), mModelOutput(), mRelOutput(), mContentOutput(), mBuildItems(), mRelations() {
    // empty
 }

@ -249,10 +249,10 @@ void D3MFExporter::writeBaseMaterials() {
            if (color.r <= 1 && color.g <= 1 && color.b <= 1 && color.a <= 1) {

                hexDiffuseColor = ai_rgba2hex(
-                        (int)(((ai_real)color.r) * 255),
-                        (int)(((ai_real)color.g) * 255),
-                        (int)(((ai_real)color.b) * 255),
-                        (int)(((ai_real)color.a) * 255),
+                        (int)((ai_real)color.r) * 255,
+                        (int)((ai_real)color.g) * 255,
+                        (int)((ai_real)color.b) * 255,
+                        (int)((ai_real)color.a) * 255,
                        true);

            } else {
--- a/code/AssetLib/3MF/D3MFExporter.h
+++ b/code/AssetLib/3MF/D3MFExporter.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -40,9 +40,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 #pragma once

-#ifndef ASSIMP_BUILD_NO_EXPORT
-#ifndef ASSIMP_BUILD_NO_3MF_EXPORTER
-
 #include <memory>
 #include <sstream>
 #include <vector>
@ -61,6 +58,8 @@ class IOStream;

 namespace D3MF {

+#ifndef ASSIMP_BUILD_NO_EXPORT
+#ifndef ASSIMP_BUILD_NO_3MF_EXPORTER

 struct OpcPackageRelationship;

@ -101,11 +100,9 @@ private:
    std::vector<OpcPackageRelationship*> mRelations;
 };

+#endif // ASSIMP_BUILD_NO_3MF_EXPORTER
+#endif // ASSIMP_BUILD_NO_EXPORT

 } // Namespace D3MF
 } // Namespace Assimp

-#endif // ASSIMP_BUILD_NO_3MF_EXPORTER
-#endif // ASSIMP_BUILD_NO_EXPORT
-
-
--- a/code/AssetLib/3MF/D3MFImporter.cpp
+++ b/code/AssetLib/3MF/D3MFImporter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -44,7 +44,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "D3MFImporter.h"
 #include "3MFXmlTags.h"
 #include "D3MFOpcPackage.h"
-#include "XmlSerializer.h"

 #include <assimp/StringComparison.h>
 #include <assimp/StringUtils.h>
@ -62,13 +61,517 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <string>
 #include <vector>
 #include <iomanip>
-#include <cstring>
+#include <string.h>

 namespace Assimp {
+namespace D3MF {
+
+enum class ResourceType {
+    RT_Object,
+    RT_BaseMaterials,
+    RT_Unknown
+}; // To be extended with other resource types (eg. material extension resources like Texture2d, Texture2dGroup...)
+
+class Resource {
+public:
+    int mId;
+
+    Resource(int id) :
+            mId(id) {
+        // empty
+    }
+
+    virtual ~Resource() {
+        // empty
+    }
+
+    virtual ResourceType getType() const {
+        return ResourceType::RT_Unknown;
+    }
+};
+
+class BaseMaterials : public Resource {
+public:
+    std::vector<aiMaterial *> mMaterials;
+    std::vector<unsigned int> mMaterialIndex;
+
+    BaseMaterials(int id) :
+            Resource(id),
+            mMaterials(),
+            mMaterialIndex() {
+        // empty
+    }
+
+    ~BaseMaterials() = default;
+
+    ResourceType getType() const override {
+        return ResourceType::RT_BaseMaterials;
+    }
+};
+
+struct Component {
+    int mObjectId;
+    aiMatrix4x4 mTransformation;
+};
+
+class Object : public Resource {
+public:
+    std::vector<aiMesh *> mMeshes;
+    std::vector<unsigned int> mMeshIndex;
+    std::vector<Component> mComponents;
+    std::string mName;
+
+    Object(int id) :
+            Resource(id),
+            mName(std::string("Object_") + ai_to_string(id)) {
+        // empty
+    }
+
+    ~Object() = default;
+
+    ResourceType getType() const override {
+        return ResourceType::RT_Object;
+    }
+};
+
+class XmlSerializer {
+public:
+    XmlSerializer(XmlParser *xmlParser) :
+            mResourcesDictionnary(),
+            mMaterialCount(0),
+            mMeshCount(0),
+            mXmlParser(xmlParser) {
+        // empty
+    }
+
+    ~XmlSerializer() {
+        for (auto it = mResourcesDictionnary.begin(); it != mResourcesDictionnary.end(); ++it ) {
+            delete it->second;
+        }
+    }
+
+    void ImportXml(aiScene *scene) {
+        if (nullptr == scene) {
+            return;
+        }
+
+        scene->mRootNode = new aiNode(XmlTag::RootTag);
+
+        XmlNode node = mXmlParser->getRootNode().child(XmlTag::model);
+        if (node.empty()) {
+            return;
+        }
+        XmlNode resNode = node.child(XmlTag::resources);
+        for (auto &currentNode : resNode.children()) {
+            const std::string currentNodeName = currentNode.name();
+            if (currentNodeName == XmlTag::object) {
+                ReadObject(currentNode);
+            } else if (currentNodeName == XmlTag::basematerials) {
+                ReadBaseMaterials(currentNode);
+            } else if (currentNodeName == XmlTag::meta) {
+                ReadMetadata(currentNode);
+            }
+        }
+
+        XmlNode buildNode = node.child(XmlTag::build);
+        for (auto &currentNode : buildNode.children()) {
+            const std::string currentNodeName = currentNode.name();
+            if (currentNodeName == XmlTag::item) {
+                int objectId = -1;
+                std::string transformationMatrixStr;
+                aiMatrix4x4 transformationMatrix;
+                getNodeAttribute(currentNode, D3MF::XmlTag::objectid, objectId);
+                bool hasTransform = getNodeAttribute(currentNode, D3MF::XmlTag::transform, transformationMatrixStr);
+
+                auto it = mResourcesDictionnary.find(objectId);
+                if (it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_Object) {
+                    Object *obj = static_cast<Object *>(it->second);
+                    if (hasTransform) {
+                        transformationMatrix = parseTransformMatrix(transformationMatrixStr);
+                    }
+
+                    addObjectToNode(scene->mRootNode, obj, transformationMatrix);
+                }
+            }
+        }
+
+        // import the metadata
+        if (!mMetaData.empty()) {
+            const size_t numMeta = mMetaData.size();
+            scene->mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(numMeta));
+            for (size_t i = 0; i < numMeta; ++i) {
+                aiString val(mMetaData[i].value);
+                scene->mMetaData->Set(static_cast<unsigned int>(i), mMetaData[i].name, val);
+            }
+        }
+
+        // import the meshes
+        scene->mNumMeshes = static_cast<unsigned int>(mMeshCount);
+        if (scene->mNumMeshes != 0) {
+            scene->mMeshes = new aiMesh *[scene->mNumMeshes]();
+            for (auto it = mResourcesDictionnary.begin(); it != mResourcesDictionnary.end(); ++it) {
+                if (it->second->getType() == ResourceType::RT_Object) {
+                    Object *obj = static_cast<Object *>(it->second);
+                    ai_assert(nullptr != obj);
+                    for (unsigned int i = 0; i < obj->mMeshes.size(); ++i) {
+                        scene->mMeshes[obj->mMeshIndex[i]] = obj->mMeshes[i];
+                    }
+                }
+            }
+        }
+
+        // import the materials
+        scene->mNumMaterials = mMaterialCount;
+        if (scene->mNumMaterials != 0) {
+            scene->mMaterials = new aiMaterial *[scene->mNumMaterials];
+            for (auto it = mResourcesDictionnary.begin(); it != mResourcesDictionnary.end(); ++it) {
+                if (it->second->getType() == ResourceType::RT_BaseMaterials) {
+                    BaseMaterials *baseMaterials = static_cast<BaseMaterials *>(it->second);
+                    for (unsigned int i = 0; i < baseMaterials->mMaterials.size(); ++i) {
+                        scene->mMaterials[baseMaterials->mMaterialIndex[i]] = baseMaterials->mMaterials[i];
+                    }
+                }
+            }
+        }
+    }
+
+private:
+    void addObjectToNode(aiNode *parent, Object *obj, aiMatrix4x4 nodeTransform) {
+        ai_assert(nullptr != obj);
+
+        aiNode *sceneNode = new aiNode(obj->mName);
+        sceneNode->mNumMeshes = static_cast<unsigned int>(obj->mMeshes.size());
+        sceneNode->mMeshes = new unsigned int[sceneNode->mNumMeshes];
+        std::copy(obj->mMeshIndex.begin(), obj->mMeshIndex.end(), sceneNode->mMeshes);
+
+        sceneNode->mTransformation = nodeTransform;
+        if (nullptr != parent) {
+            parent->addChildren(1, &sceneNode);
+        }
+
+        for (size_t i = 0; i < obj->mComponents.size(); ++i) {
+            Component c = obj->mComponents[i];
+            auto it = mResourcesDictionnary.find(c.mObjectId);
+            if (it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_Object) {
+                addObjectToNode(sceneNode, static_cast<Object *>(it->second), c.mTransformation);
+            }
+        }
+    }
+
+    bool getNodeAttribute(const XmlNode &node, const std::string &attribute, std::string &value) {
+        pugi::xml_attribute objectAttribute = node.attribute(attribute.c_str());
+        if (!objectAttribute.empty()) {
+            value = objectAttribute.as_string();
+            return true;
+        }
+
+        return false;
+    }
+
+    bool getNodeAttribute(const XmlNode &node, const std::string &attribute, int &value) {
+        std::string strValue;
+        bool ret = getNodeAttribute(node, attribute, strValue);
+        if (ret) {
+            value = std::atoi(strValue.c_str());
+            return true;
+        } 
+
+        return false;
+    }
+
+    aiMatrix4x4 parseTransformMatrix(std::string matrixStr) {
+        // split the string
+        std::vector<float> numbers;
+        std::string currentNumber;
+        for (size_t i = 0; i < matrixStr.size(); ++i) {
+            const char c = matrixStr[i];
+            if (c == ' ') {
+                if (currentNumber.size() > 0) {
+                    float f = std::stof(currentNumber);
+                    numbers.push_back(f);
+                    currentNumber.clear();
+                }
+            } else {
+                currentNumber.push_back(c);
+            }
+        }
+        if (currentNumber.size() > 0) {
+            const float f = std::stof(currentNumber);
+            numbers.push_back(f);
+        }
+
+        aiMatrix4x4 transformMatrix;
+        transformMatrix.a1 = numbers[0];
+        transformMatrix.b1 = numbers[1];
+        transformMatrix.c1 = numbers[2];
+        transformMatrix.d1 = 0;
+
+        transformMatrix.a2 = numbers[3];
+        transformMatrix.b2 = numbers[4];
+        transformMatrix.c2 = numbers[5];
+        transformMatrix.d2 = 0;
+
+        transformMatrix.a3 = numbers[6];
+        transformMatrix.b3 = numbers[7];
+        transformMatrix.c3 = numbers[8];
+        transformMatrix.d3 = 0;
+
+        transformMatrix.a4 = numbers[9];
+        transformMatrix.b4 = numbers[10];
+        transformMatrix.c4 = numbers[11];
+        transformMatrix.d4 = 1;
+
+        return transformMatrix;
+    }
+
+    void ReadObject(XmlNode &node) {
+        int id = -1, pid = -1, pindex = -1;
+        bool hasId = getNodeAttribute(node, XmlTag::id, id);
+        bool hasPid = getNodeAttribute(node, XmlTag::pid, pid);
+        bool hasPindex = getNodeAttribute(node, XmlTag::pindex, pindex);
+        if (!hasId) {
+            return;
+        }
+
+        Object *obj = new Object(id);
+
+        for (XmlNode &currentNode : node.children()) {
+            const std::string &currentName = currentNode.name();
+            if (currentName == D3MF::XmlTag::mesh) {
+                auto mesh = ReadMesh(currentNode);
+                mesh->mName.Set(ai_to_string(id));
+
+                if (hasPid) {
+                    auto it = mResourcesDictionnary.find(pid);
+                    if (hasPindex && it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_BaseMaterials) {
+                        BaseMaterials *materials = static_cast<BaseMaterials *>(it->second);
+                        mesh->mMaterialIndex = materials->mMaterialIndex[pindex];
+                    }
+                }
+
+                obj->mMeshes.push_back(mesh);
+                obj->mMeshIndex.push_back(mMeshCount);
+                mMeshCount++;
+            } else if (currentName == D3MF::XmlTag::components) {
+                for (XmlNode &currentSubNode : currentNode.children()) {
+                    const std::string subNodeName = currentSubNode.name();
+                    if (subNodeName == D3MF::XmlTag::component) {
+                        int objectId = -1;
+                        std::string componentTransformStr;
+                        aiMatrix4x4 componentTransform;
+                        if (getNodeAttribute(currentSubNode, D3MF::XmlTag::transform, componentTransformStr)) {
+                            componentTransform = parseTransformMatrix(componentTransformStr);
+                        }
+
+                        if (getNodeAttribute(currentSubNode, D3MF::XmlTag::objectid, objectId)) {
+                            obj->mComponents.push_back({ objectId, componentTransform });
+                        }
+                    }
+                }
+            }
+        }
+
+        mResourcesDictionnary.insert(std::make_pair(id, obj));
+    }
+
+    aiMesh *ReadMesh(XmlNode &node) {
+        aiMesh *mesh = new aiMesh();
+
+        for (XmlNode &currentNode : node.children()) {
+            const std::string currentName = currentNode.name();
+            if (currentName == XmlTag::vertices) {
+                ImportVertices(currentNode, mesh);
+            } else if (currentName == XmlTag::triangles) {
+                ImportTriangles(currentNode, mesh);
+            }
+        }
+
+        return mesh;
+    }
+
+    void ReadMetadata(XmlNode &node) {
+        pugi::xml_attribute attribute = node.attribute(D3MF::XmlTag::meta_name);
+        const std::string name = attribute.as_string();
+        const std::string value = node.value();
+        if (name.empty()) {
+            return;
+        }
+
+        MetaEntry entry;
+        entry.name = name;
+        entry.value = value;
+        mMetaData.push_back(entry);
+    }
+
+    void ImportVertices(XmlNode &node, aiMesh *mesh) {
+        std::vector<aiVector3D> vertices;
+        for (XmlNode &currentNode : node.children()) {
+            const std::string currentName = currentNode.name();
+            if (currentName == XmlTag::vertex) {
+                vertices.push_back(ReadVertex(currentNode));
+            }
+        }
+
+        mesh->mNumVertices = static_cast<unsigned int>(vertices.size());
+        mesh->mVertices = new aiVector3D[mesh->mNumVertices];
+        std::copy(vertices.begin(), vertices.end(), mesh->mVertices);
+    }
+
+    aiVector3D ReadVertex(XmlNode &node) {
+        aiVector3D vertex;
+        vertex.x = ai_strtof(node.attribute(XmlTag::x).as_string(), nullptr);
+        vertex.y = ai_strtof(node.attribute(XmlTag::y).as_string(), nullptr);
+        vertex.z = ai_strtof(node.attribute(XmlTag::z).as_string(), nullptr);
+
+        return vertex;
+    }
+
+    void ImportTriangles(XmlNode &node, aiMesh *mesh) {
+        std::vector<aiFace> faces;
+        for (XmlNode &currentNode : node.children()) {
+            const std::string currentName = currentNode.name();
+            if (currentName == XmlTag::triangle) {
+                aiFace face = ReadTriangle(currentNode);
+                faces.push_back(face);
+
+                int pid = 0, p1 = 0;
+                bool hasPid = getNodeAttribute(currentNode, D3MF::XmlTag::pid, pid);
+                bool hasP1 = getNodeAttribute(currentNode, D3MF::XmlTag::p1, p1);
+
+                if (hasPid && hasP1) {
+                    auto it = mResourcesDictionnary.find(pid);
+                    if (it != mResourcesDictionnary.end()) {
+                        if (it->second->getType() == ResourceType::RT_BaseMaterials) {
+                            BaseMaterials *baseMaterials = static_cast<BaseMaterials *>(it->second);
+                            mesh->mMaterialIndex = baseMaterials->mMaterialIndex[p1];
+                        }
+                        // TODO: manage the separation into several meshes if the triangles of the mesh do not all refer to the same material
+                    }
+                }
+            }
+        }
+
+        mesh->mNumFaces = static_cast<unsigned int>(faces.size());
+        mesh->mFaces = new aiFace[mesh->mNumFaces];
+        mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
+
+        std::copy(faces.begin(), faces.end(), mesh->mFaces);
+    }
+
+    aiFace ReadTriangle(XmlNode &node) {
+        aiFace face;
+
+        face.mNumIndices = 3;
+        face.mIndices = new unsigned int[face.mNumIndices];
+        face.mIndices[0] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v1).as_string()));
+        face.mIndices[1] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v2).as_string()));
+        face.mIndices[2] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v3).as_string()));
+
+        return face;
+    }
+
+    void ReadBaseMaterials(XmlNode &node) {
+        int id = -1;
+        if (getNodeAttribute(node, D3MF::XmlTag::basematerials_id, id)) {
+            BaseMaterials *baseMaterials = new BaseMaterials(id);
+
+            for (XmlNode &currentNode : node.children()) {
+                const std::string currentName = currentNode.name();
+                if (currentName == XmlTag::basematerials_base) {
+                    baseMaterials->mMaterialIndex.push_back(mMaterialCount);
+                    baseMaterials->mMaterials.push_back(readMaterialDef(currentNode, id));
+                    ++mMaterialCount;
+                }
+            }
+
+            mResourcesDictionnary.insert(std::make_pair(id, baseMaterials));
+        }
+    }
+
+    bool parseColor(const char *color, aiColor4D &diffuse) {
+        if (nullptr == color) {
+            return false;
+        }
+
+        //format of the color string: #RRGGBBAA or #RRGGBB (3MF Core chapter 5.1.1)
+        const size_t len = strlen(color);
+        if (9 != len && 7 != len) {
+            return false;
+        }
+
+        const char *buf(color);
+        if ('#' != buf[0]) {
+            return false;
+        }
+
+        char r[3] = { buf[1], buf[2], '\0' };
+        diffuse.r = static_cast<ai_real>(strtol(r, nullptr, 16)) / ai_real(255.0);
+
+        char g[3] = { buf[3], buf[4], '\0' };
+        diffuse.g = static_cast<ai_real>(strtol(g, nullptr, 16)) / ai_real(255.0);
+
+        char b[3] = { buf[5], buf[6], '\0' };
+        diffuse.b = static_cast<ai_real>(strtol(b, nullptr, 16)) / ai_real(255.0);
+
+        if (7 == len)
+            return true;
+
+        char a[3] = { buf[7], buf[8], '\0' };
+        diffuse.a = static_cast<ai_real>(strtol(a, nullptr, 16)) / ai_real(255.0);
+
+        return true;
+    }
+
+    void assignDiffuseColor(XmlNode &node, aiMaterial *mat) {
+        const char *color = node.attribute(XmlTag::basematerials_displaycolor).as_string();
+        aiColor4D diffuse;
+        if (parseColor(color, diffuse)) {
+            mat->AddProperty<aiColor4D>(&diffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
+        }
+    }
+
+    aiMaterial *readMaterialDef(XmlNode &node, unsigned int basematerialsId) {
+        aiMaterial *material = new aiMaterial();
+        material->mNumProperties = 0;
+        std::string name;
+        bool hasName = getNodeAttribute(node, D3MF::XmlTag::basematerials_name, name);
+
+        std::string stdMaterialName;
+        const std::string strId(ai_to_string(basematerialsId));
+        stdMaterialName += "id";
+        stdMaterialName += strId;
+        stdMaterialName += "_";
+        if (hasName) {
+            stdMaterialName += std::string(name);
+        } else {
+            stdMaterialName += "basemat_";
+            stdMaterialName += ai_to_string(mMaterialCount - basematerialsId);
+        }
+
+        aiString assimpMaterialName(stdMaterialName);
+        material->AddProperty(&assimpMaterialName, AI_MATKEY_NAME);
+
+        assignDiffuseColor(node, material);
+
+        return material;
+    }
+
+private:
+    struct MetaEntry {
+        std::string name;
+        std::string value;
+    };
+    std::vector<MetaEntry> mMetaData;
+    std::map<unsigned int, Resource *> mResourcesDictionnary;
+    unsigned int mMaterialCount, mMeshCount;
+    XmlParser *mXmlParser;
+};
+
+} //namespace D3MF

 using namespace D3MF;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "3mf Importer",
    "",
    "",
@ -81,20 +584,34 @@ static constexpr aiImporterDesc desc = {
    "3mf"
 };

-bool D3MFImporter::CanRead(const std::string &filename, IOSystem *pIOHandler, bool ) const {
+D3MFImporter::D3MFImporter() :
+        BaseImporter() {
+    // empty
+}
+
+D3MFImporter::~D3MFImporter() {
+    // empty
+}
+
+bool D3MFImporter::CanRead(const std::string &filename, IOSystem *pIOHandler, bool checkSig) const {
+    const std::string extension(GetExtension(filename));
+    if (extension == desc.mFileExtensions) {
+        return true;
+    } else if (!extension.length() || checkSig) {
+        if (nullptr == pIOHandler) {
+            return false;
+        }
        if (!ZipArchiveIOSystem::isZipArchive(pIOHandler, filename)) {
            return false;
        }
-    static const char *const ModelRef = "3D/3dmodel.model";
-    ZipArchiveIOSystem archive(pIOHandler, filename);
-    if (!archive.Exists(ModelRef)) {
-        return false;
+        D3MFOpcPackage opcPackage(pIOHandler, filename);
+        return opcPackage.validate();
    }

-    return true;
+    return false;
 }

-void D3MFImporter::SetupProperties(const Importer*) {
+void D3MFImporter::SetupProperties(const Importer * /*pImp*/) {
    // empty
 }

@ -109,15 +626,6 @@ void D3MFImporter::InternReadFile(const std::string &filename, aiScene *pScene,
    if (xmlParser.parse(opcPackage.RootStream())) {
        XmlSerializer xmlSerializer(&xmlParser);
        xmlSerializer.ImportXml(pScene);
-
-        const std::vector<aiTexture*> &tex =  opcPackage.GetEmbeddedTextures();
-        if (!tex.empty()) {
-            pScene->mNumTextures = static_cast<unsigned int>(tex.size());
-            pScene->mTextures = new aiTexture *[pScene->mNumTextures];
-            for (unsigned int i = 0; i < pScene->mNumTextures; ++i) {
-                pScene->mTextures[i] = tex[i];
-            }
-        }
    }
 }

--- a/code/AssetLib/3MF/D3MFImporter.h
+++ b/code/AssetLib/3MF/D3MFImporter.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -42,50 +43,23 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef AI_D3MFLOADER_H_INCLUDED
 #define AI_D3MFLOADER_H_INCLUDED

-#ifndef ASSIMP_BUILD_NO_3MF_IMPORTER
-
 #include <assimp/BaseImporter.h>

 namespace Assimp {

-// ---------------------------------------------------------------------------
 /// @brief  The 3MF-importer class.
-///
-/// Implements the basic topology import and embedded textures.
-// ---------------------------------------------------------------------------
 class D3MFImporter : public BaseImporter {
 public:
-    /// @brief The default class constructor.
-    D3MFImporter() = default;
-
-    ///	@brief  The class destructor.
-    ~D3MFImporter() override = default;
-
-    /// @brief Performs the data format detection.
-    /// @param pFile        The filename to check.
-    /// @param pIOHandler   The used IO-System.
-    /// @param checkSig     true for signature checking.
-    /// @return true for can be loaded, false for not.
-    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const override;
-
-    /// @brief  Not used
-    /// @param pImp Not used
-    void SetupProperties(const Importer *pImp) override;
-
-    /// @brief The importer description getter.
-    /// @return The info
-    const aiImporterDesc *GetInfo() const override;
+    D3MFImporter();
+    ~D3MFImporter();
+    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const;
+    void SetupProperties(const Importer *pImp);
+    const aiImporterDesc *GetInfo() const;

 protected:
-    /// @brief Internal read function, performs the file parsing.
-    /// @param pFile        The filename
-    /// @param pScene       The scene to load in.
-    /// @param pIOHandler   The io-system
-    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;
+    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler);
 };

 } // Namespace Assimp

-#endif // #ifndef ASSIMP_BUILD_NO_3MF_IMPORTER
-
 #endif // AI_D3MFLOADER_H_INCLUDED
--- a/code/AssetLib/3MF/D3MFOpcPackage.cpp
+++ b/code/AssetLib/3MF/D3MFOpcPackage.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -43,19 +43,20 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #include "D3MFOpcPackage.h"
 #include <assimp/Exceptional.h>
+
 #include <assimp/XmlParser.h>
 #include <assimp/ZipArchiveIOSystem.h>
 #include <assimp/ai_assert.h>
 #include <assimp/DefaultLogger.hpp>
 #include <assimp/IOStream.hpp>
 #include <assimp/IOSystem.hpp>
-#include <assimp/texture.h>
-#include "3MFXmlTags.h"

+#include "3MFXmlTags.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdlib>
 #include <map>
+#include <memory>
 #include <vector>

 namespace Assimp {
@ -63,12 +64,11 @@ namespace Assimp {
 namespace D3MF {
 // ------------------------------------------------------------------------------------------------

-using OpcPackageRelationshipPtr = std::shared_ptr<OpcPackageRelationship>;
+typedef std::shared_ptr<OpcPackageRelationship> OpcPackageRelationshipPtr;

 class OpcPackageRelationshipReader {
 public:
-    OpcPackageRelationshipReader(XmlParser &parser) :
-            mRelations() {
+    OpcPackageRelationshipReader(XmlParser &parser) {
        XmlNode root = parser.getRootNode();
        ParseRootNode(root);
    }
@ -91,7 +91,6 @@ public:
        if (relPtr->id.empty() || relPtr->type.empty() || relPtr->target.empty()) {
            return false;
        }
-
        return true;
    }

@ -101,39 +100,27 @@ public:
        }

        for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {
-            const std::string name = currentNode.name();
+            std::string name = currentNode.name();
            if (name == "Relationship") {
                OpcPackageRelationshipPtr relPtr(new OpcPackageRelationship());
                relPtr->id = currentNode.attribute(XmlTag::RELS_ATTRIB_ID).as_string();
                relPtr->type = currentNode.attribute(XmlTag::RELS_ATTRIB_TYPE).as_string();
                relPtr->target = currentNode.attribute(XmlTag::RELS_ATTRIB_TARGET).as_string();
                if (validateRels(relPtr)) {
-                    mRelations.push_back(relPtr);
+                    m_relationShips.push_back(relPtr);
                }
            }
        }
    }

-    std::vector<OpcPackageRelationshipPtr> mRelations;
+    std::vector<OpcPackageRelationshipPtr> m_relationShips;
 };

-static bool IsEmbeddedTexture( const std::string &filename ) {
-    const std::string extension = BaseImporter::GetExtension(filename);
-    if (extension == "jpg" || extension == "png" || extension == "jpeg") {
-        std::string::size_type pos = filename.find("thumbnail");
-        if (pos != std::string::npos) {
-            return false;
-        }
-        return true;
-    }
-
-    return false;
-}
 // ------------------------------------------------------------------------------------------------
 D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :
        mRootStream(nullptr),
        mZipArchive() {
-    mZipArchive = new ZipArchiveIOSystem(pIOHandler, rFile);
+    mZipArchive.reset(new ZipArchiveIOSystem(pIOHandler, rFile));
    if (!mZipArchive->isOpen()) {
        throw DeadlyImportError("Failed to open file ", rFile, ".");
    }
@ -149,12 +136,12 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :

            IOStream *fileStream = mZipArchive->Open(file.c_str());
            if (nullptr == fileStream) {
-                ASSIMP_LOG_ERROR("Filestream is nullptr.");
+                ai_assert(fileStream != nullptr);
                continue;
            }

            std::string rootFile = ReadPackageRootRelationship(fileStream);
-            if (!rootFile.empty() && rootFile[0] == '/') {
+            if (rootFile.size() > 0 && rootFile[0] == '/') {
                rootFile = rootFile.substr(1);
                if (rootFile[0] == '/') {
                    // deal with zip-bug
@ -171,12 +158,9 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :
            if (nullptr == mRootStream) {
                throw DeadlyImportError("Cannot open root-file in archive : " + rootFile);
            }
+
        } else if (file == D3MF::XmlTag::CONTENT_TYPES_ARCHIVE) {
            ASSIMP_LOG_WARN("Ignored file of unsupported type CONTENT_TYPES_ARCHIVES", file);
-        } else if (IsEmbeddedTexture(file)) {
-            IOStream *fileStream = mZipArchive->Open(file.c_str());
-            LoadEmbeddedTextures(fileStream, file);
-            mZipArchive->Close(fileStream);
        } else {
            ASSIMP_LOG_WARN("Ignored file of unknown type: ", file);
        }
@ -185,25 +169,20 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :

 D3MFOpcPackage::~D3MFOpcPackage() {
    mZipArchive->Close(mRootStream);
-    delete mZipArchive;
 }

 IOStream *D3MFOpcPackage::RootStream() const {
    return mRootStream;
 }

-const std::vector<aiTexture *> &D3MFOpcPackage::GetEmbeddedTextures() const {
-    return mEmbeddedTextures;
-}
-
-static const char *const ModelRef = "3D/3dmodel.model";
+static const std::string ModelRef = "3D/3dmodel.model";

 bool D3MFOpcPackage::validate() {
    if (nullptr == mRootStream || nullptr == mZipArchive) {
        return false;
    }

-    return mZipArchive->Exists(ModelRef);
+    return mZipArchive->Exists(ModelRef.c_str());
 }

 std::string D3MFOpcPackage::ReadPackageRootRelationship(IOStream *stream) {
@ -214,42 +193,17 @@ std::string D3MFOpcPackage::ReadPackageRootRelationship(IOStream *stream) {

    OpcPackageRelationshipReader reader(xmlParser);

-    auto itr = std::find_if(reader.mRelations.begin(), reader.mRelations.end(), [](const OpcPackageRelationshipPtr &rel) {
+    auto itr = std::find_if(reader.m_relationShips.begin(), reader.m_relationShips.end(), [](const OpcPackageRelationshipPtr &rel) {
        return rel->type == XmlTag::PACKAGE_START_PART_RELATIONSHIP_TYPE;
    });

-    if (itr == reader.mRelations.end()) {
+    if (itr == reader.m_relationShips.end()) {
        throw DeadlyImportError("Cannot find ", XmlTag::PACKAGE_START_PART_RELATIONSHIP_TYPE);
    }

    return (*itr)->target;
 }

-void D3MFOpcPackage::LoadEmbeddedTextures(IOStream *fileStream, const std::string &filename) {
-    if (nullptr == fileStream) {
-        return;
-    }
-
-    const size_t size = fileStream->FileSize();
-    if (0 == size) {
-        return;
-    }
-
-    unsigned char *data = new unsigned char[size];
-    fileStream->Read(data, 1, size);
-    aiTexture *texture = new aiTexture;
-    std::string embName = "*" + filename;
-    texture->mFilename.Set(embName.c_str());
-    texture->mWidth = static_cast<unsigned int>(size);
-    texture->mHeight = 0;
-    texture->achFormatHint[0] = 'p';
-    texture->achFormatHint[1] = 'n';
-    texture->achFormatHint[2] = 'g';
-    texture->achFormatHint[3] = '\0';
-    texture->pcData = (aiTexel*) data;
-    mEmbeddedTextures.emplace_back(texture);
-}
-
 } // Namespace D3MF
 } // Namespace Assimp

--- a/code/AssetLib/3MF/D3MFOpcPackage.h
+++ b/code/AssetLib/3MF/D3MFOpcPackage.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -42,15 +42,12 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef D3MFOPCPACKAGE_H
 #define D3MFOPCPACKAGE_H

-#include <assimp/IOSystem.hpp>
 #include <memory>
 #include <string>
-
-struct aiTexture;
+#include <assimp/IOSystem.hpp>

 namespace Assimp {
-
-class ZipArchiveIOSystem;
+    class ZipArchiveIOSystem;

 namespace D3MF {

@ -66,19 +63,16 @@ public:
    ~D3MFOpcPackage();
    IOStream* RootStream() const;
    bool validate();
-    const std::vector<aiTexture*> &GetEmbeddedTextures() const;

 protected:
    std::string ReadPackageRootRelationship(IOStream* stream);
-    void LoadEmbeddedTextures(IOStream *fileStream, const std::string &filename);

 private:
    IOStream* mRootStream;
-    ZipArchiveIOSystem *mZipArchive;
-    std::vector<aiTexture *> mEmbeddedTextures;
+    std::unique_ptr<ZipArchiveIOSystem> mZipArchive;
 };

-} // namespace D3MF
-} // namespace Assimp
+} // Namespace D3MF
+} // Namespace Assimp

 #endif // D3MFOPCPACKAGE_H
--- a/code/AssetLib/3MF/XmlSerializer.cpp
+++ b/code/AssetLib/3MF/XmlSerializer.cpp
@ -1,724 +0,0 @@
-/*
-Open Asset Import Library (assimp)
----------------------------------------------------------------------
-
-Copyright (c) 2006-2024, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
----------------------------------------------------------------------
-*/
-#include "XmlSerializer.h"
-#include "D3MFOpcPackage.h"
-#include "3MFXmlTags.h"
-#include "3MFTypes.h"
-#include <assimp/scene.h>
-
-#include <utility>
-
-namespace Assimp {
-namespace D3MF {
-
-static constexpr int IdNotSet = -1;
-
-namespace {
-
-static constexpr size_t ColRGBA_Len = 9;
-static constexpr size_t ColRGB_Len = 7;
-
-// format of the color string: #RRGGBBAA or #RRGGBB (3MF Core chapter 5.1.1)
-bool validateColorString(const std::string color) {
-    const size_t len = color.size();
-    if (ColRGBA_Len != len && ColRGB_Len != len) {
-        return false;
-    }
-
-    return true;
-}
-
-aiFace ReadTriangle(XmlNode &node, int &texId0, int &texId1, int &texId2) {
-    aiFace face;
-
-    face.mNumIndices = 3;
-    face.mIndices = new unsigned int[face.mNumIndices];
-    face.mIndices[0] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v1).as_string()));
-    face.mIndices[1] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v2).as_string()));
-    face.mIndices[2] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v3).as_string()));
-
-    texId0 = texId1 = texId2 = IdNotSet;
-    XmlParser::getIntAttribute(node, XmlTag::p1, texId0);
-    XmlParser::getIntAttribute(node, XmlTag::p2, texId1);
-    XmlParser::getIntAttribute(node, XmlTag::p3, texId2);
-
-    return face;
-}
-
-aiVector3D ReadVertex(XmlNode &node) {
-    aiVector3D vertex;
-    vertex.x = ai_strtof(node.attribute(XmlTag::x).as_string(), nullptr);
-    vertex.y = ai_strtof(node.attribute(XmlTag::y).as_string(), nullptr);
-    vertex.z = ai_strtof(node.attribute(XmlTag::z).as_string(), nullptr);
-
-    return vertex;
-}
-
-bool getNodeAttribute(const XmlNode &node, const std::string &attribute, std::string &value) {
-    pugi::xml_attribute objectAttribute = node.attribute(attribute.c_str());
-    if (!objectAttribute.empty()) {
-        value = objectAttribute.as_string();
-        return true;
-    }
-
-    return false;
-}
-
-bool getNodeAttribute(const XmlNode &node, const std::string &attribute, int &value) {
-    std::string strValue;
-    const bool ret = getNodeAttribute(node, attribute, strValue);
-    if (ret) {
-        value = std::atoi(strValue.c_str());
-        return true;
-    }
-
-    return false;
-}
-
-aiMatrix4x4 parseTransformMatrix(const std::string& matrixStr) {
-    // split the string
-    std::vector<float> numbers;
-    std::string currentNumber;
-    for (char c : matrixStr) {
-        if (c == ' ') {
-            if (!currentNumber.empty()) {
-                float f = std::stof(currentNumber);
-                numbers.push_back(f);
-                currentNumber.clear();
-            }
-        } else {
-            currentNumber.push_back(c);
-        }
-    }
-    if (!currentNumber.empty()) {
-        const float f = std::stof(currentNumber);
-        numbers.push_back(f);
-    }
-
-    aiMatrix4x4 transformMatrix;
-    transformMatrix.a1 = numbers[0];
-    transformMatrix.b1 = numbers[1];
-    transformMatrix.c1 = numbers[2];
-    transformMatrix.d1 = 0;
-
-    transformMatrix.a2 = numbers[3];
-    transformMatrix.b2 = numbers[4];
-    transformMatrix.c2 = numbers[5];
-    transformMatrix.d2 = 0;
-
-    transformMatrix.a3 = numbers[6];
-    transformMatrix.b3 = numbers[7];
-    transformMatrix.c3 = numbers[8];
-    transformMatrix.d3 = 0;
-
-    transformMatrix.a4 = numbers[9];
-    transformMatrix.b4 = numbers[10];
-    transformMatrix.c4 = numbers[11];
-    transformMatrix.d4 = 1;
-
-    return transformMatrix;
-}
-
-bool parseColor(const std::string &color, aiColor4D &diffuse) {
-    if (color.empty()) {
-        return false;
-    }
-
-    if (!validateColorString(color)) {
-        return false;
-    }
-
-    if ('#' != color[0]) {
-        return false;
-    }
-
-    char r[3] = { color[1], color[2], '\0' };
-    diffuse.r = static_cast<ai_real>(strtol(r, nullptr, 16)) / ai_real(255.0);
-
-    char g[3] = { color[3], color[4], '\0' };
-    diffuse.g = static_cast<ai_real>(strtol(g, nullptr, 16)) / ai_real(255.0);
-
-    char b[3] = { color[5], color[6], '\0' };
-    diffuse.b = static_cast<ai_real>(strtol(b, nullptr, 16)) / ai_real(255.0);
-    const size_t len = color.size();
-    if (ColRGB_Len == len) {
-        return true;
-    }
-
-    char a[3] = { color[7], color[8], '\0' };
-    diffuse.a = static_cast<ai_real>(strtol(a, nullptr, 16)) / ai_real(255.0);
-
-    return true;
-}
-
-void assignDiffuseColor(XmlNode &node, aiMaterial *mat) {
-    const char *color = node.attribute(XmlTag::basematerials_displaycolor).as_string();
-    aiColor4D diffuse;
-    if (parseColor(color, diffuse)) {
-        mat->AddProperty<aiColor4D>(&diffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
-    }
-}
-
-} // namespace
-
-XmlSerializer::XmlSerializer(XmlParser *xmlParser) :
-        mResourcesDictionnary(),
-        mMeshCount(0),
-        mXmlParser(xmlParser) {
-    ai_assert(nullptr != xmlParser);
-}
-
-XmlSerializer::~XmlSerializer() {
-    for (auto &it : mResourcesDictionnary) {
-        delete it.second;
-    }
-}
-
-void XmlSerializer::ImportXml(aiScene *scene) {
-    if (nullptr == scene) {
-        return;
-    }
-
-    scene->mRootNode = new aiNode(XmlTag::RootTag);
-    XmlNode node = mXmlParser->getRootNode().child(XmlTag::model);
-    if (node.empty()) {
-        return;
-    }
-
-    XmlNode resNode = node.child(XmlTag::resources);
-    for (auto &currentNode : resNode.children()) {
-        const std::string currentNodeName = currentNode.name();
-        if (currentNodeName == XmlTag::texture_2d) {
-            ReadEmbeddecTexture(currentNode);
-        } else if (currentNodeName == XmlTag::texture_group) {
-            ReadTextureGroup(currentNode);
-        } else if (currentNodeName == XmlTag::object) {
-            ReadObject(currentNode);
-        } else if (currentNodeName == XmlTag::basematerials) {
-            ReadBaseMaterials(currentNode);
-        } else if (currentNodeName == XmlTag::meta) {
-            ReadMetadata(currentNode);
-        } else if (currentNodeName == XmlTag::colorgroup) {
-            ReadColorGroup(currentNode);
-        }
-    }
-    StoreMaterialsInScene(scene);
-    XmlNode buildNode = node.child(XmlTag::build);
-    if (buildNode.empty()) {
-        return;
-    }
-
-    for (auto &currentNode : buildNode.children()) {
-        const std::string currentNodeName = currentNode.name();
-        if (currentNodeName == XmlTag::item) {
-            int objectId = IdNotSet;
-            std::string transformationMatrixStr;
-            aiMatrix4x4 transformationMatrix;
-            getNodeAttribute(currentNode, D3MF::XmlTag::objectid, objectId);
-            bool hasTransform = getNodeAttribute(currentNode, D3MF::XmlTag::transform, transformationMatrixStr);
-
-            auto it = mResourcesDictionnary.find(objectId);
-            if (it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_Object) {
-                Object *obj = static_cast<Object *>(it->second);
-                if (hasTransform) {
-                    transformationMatrix = parseTransformMatrix(transformationMatrixStr);
-                }
-
-                addObjectToNode(scene->mRootNode, obj, transformationMatrix);
-            }
-        }
-    }
-
-    // import the metadata
-    if (!mMetaData.empty()) {
-        const size_t numMeta = mMetaData.size();
-        scene->mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(numMeta));
-        for (size_t i = 0; i < numMeta; ++i) {
-            aiString val(mMetaData[i].value);
-            scene->mMetaData->Set(static_cast<unsigned int>(i), mMetaData[i].name, val);
-        }
-    }
-
-    // import the meshes, materials are already stored
-    scene->mNumMeshes = static_cast<unsigned int>(mMeshCount);
-    if (scene->mNumMeshes != 0) {
-        scene->mMeshes = new aiMesh *[scene->mNumMeshes]();
-        for (auto &it : mResourcesDictionnary) {
-            if (it.second->getType() == ResourceType::RT_Object) {
-                Object *obj = static_cast<Object *>(it.second);
-                ai_assert(nullptr != obj);
-                for (unsigned int i = 0; i < obj->mMeshes.size(); ++i) {
-                    scene->mMeshes[obj->mMeshIndex[i]] = obj->mMeshes[i];
-                }
-            }
-        }
-    }
-}
-
-void XmlSerializer::addObjectToNode(aiNode *parent, Object *obj, aiMatrix4x4 nodeTransform) {
-    ai_assert(nullptr != obj);
-
-    aiNode *sceneNode = new aiNode(obj->mName);
-    sceneNode->mNumMeshes = static_cast<unsigned int>(obj->mMeshes.size());
-    sceneNode->mMeshes = new unsigned int[sceneNode->mNumMeshes];
-    std::copy(obj->mMeshIndex.begin(), obj->mMeshIndex.end(), sceneNode->mMeshes);
-
-    sceneNode->mTransformation = nodeTransform;
-    if (nullptr != parent) {
-        parent->addChildren(1, &sceneNode);
-    }
-
-    for (Assimp::D3MF::Component c : obj->mComponents) {
-        auto it = mResourcesDictionnary.find(c.mObjectId);
-        if (it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_Object) {
-            addObjectToNode(sceneNode, static_cast<Object *>(it->second), c.mTransformation);
-        }
-    }
-}
-
-void XmlSerializer::ReadObject(XmlNode &node) {
-    int id = IdNotSet, pid = IdNotSet, pindex = IdNotSet;
-    bool hasId = getNodeAttribute(node, XmlTag::id, id);
-    if (!hasId) {
-        return;
-    }
-
-    bool hasPid = getNodeAttribute(node, XmlTag::pid, pid);
-    bool hasPindex = getNodeAttribute(node, XmlTag::pindex, pindex);
-
-    Object *obj = new Object(id);
-    for (XmlNode &currentNode : node.children()) {
-        const std::string currentName = currentNode.name();
-        if (currentName == D3MF::XmlTag::mesh) {
-            auto mesh = ReadMesh(currentNode);
-            mesh->mName.Set(ai_to_string(id));
-
-            if (hasPid) {
-                auto it = mResourcesDictionnary.find(pid);
-                if (hasPindex && it != mResourcesDictionnary.end()) {
-                    if (it->second->getType() == ResourceType::RT_BaseMaterials) {
-                        BaseMaterials *materials = static_cast<BaseMaterials *>(it->second);
-                        mesh->mMaterialIndex = materials->mMaterialIndex[pindex];
-                    } else if (it->second->getType() == ResourceType::RT_Texture2DGroup) {
-                        Texture2DGroup *group = static_cast<Texture2DGroup *>(it->second);
-                        if (mesh->mTextureCoords[0] == nullptr) {
-                            mesh->mNumUVComponents[0] = 2;
-                            for (unsigned int i = 1; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-                                mesh->mNumUVComponents[i] = 0;
-                            }
-
-                            const std::string name = ai_to_string(group->mTexId);
-                            for (size_t i = 0; i < mMaterials.size(); ++i) {
-                                if (name == mMaterials[i]->GetName().C_Str()) {
-                                    mesh->mMaterialIndex = static_cast<unsigned int>(i);
-                                }
-                            }
-
-                            mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
-                            for (unsigned int vertex_idx = 0; vertex_idx < mesh->mNumVertices; vertex_idx++) {
-                                mesh->mTextureCoords[0][vertex_idx] =
-                                        aiVector3D(group->mTex2dCoords[pindex].x, group->mTex2dCoords[pindex].y, 0.0f);
-                            }
-                        } else {
-                            for (unsigned int vertex_idx = 0; vertex_idx < mesh->mNumVertices; vertex_idx++) {
-                                if (mesh->mTextureCoords[0][vertex_idx].z < 0) {
-                                    // use default
-                                    mesh->mTextureCoords[0][vertex_idx] =
-                                            aiVector3D(group->mTex2dCoords[pindex].x, group->mTex2dCoords[pindex].y, 0.0f);
-                                }
-                            }
-                        }
-                    }else if (it->second->getType() == ResourceType::RT_ColorGroup) {
-                        if (mesh->mColors[0] == nullptr) {
-                            mesh->mColors[0] = new aiColor4D[mesh->mNumVertices];
-
-                            ColorGroup *group = static_cast<ColorGroup *>(it->second);
-                            for (unsigned int vertex_idx = 0; vertex_idx < mesh->mNumVertices; vertex_idx++) {
-                                mesh->mColors[0][vertex_idx] = group->mColors[pindex];
-                            }
-                        }
-                    }
-                }
-            }
-
-            obj->mMeshes.push_back(mesh);
-            obj->mMeshIndex.push_back(mMeshCount);
-            mMeshCount++;
-        } else if (currentName == D3MF::XmlTag::components) {
-            for (XmlNode &currentSubNode : currentNode.children()) {
-                const std::string subNodeName = currentSubNode.name();
-                if (subNodeName == D3MF::XmlTag::component) {
-                    int objectId = IdNotSet;
-                    std::string componentTransformStr;
-                    aiMatrix4x4 componentTransform;
-                    if (getNodeAttribute(currentSubNode, D3MF::XmlTag::transform, componentTransformStr)) {
-                        componentTransform = parseTransformMatrix(componentTransformStr);
-                    }
-
-                    if (getNodeAttribute(currentSubNode, D3MF::XmlTag::objectid, objectId)) {
-                        obj->mComponents.push_back({ objectId, componentTransform });
-                    }
-                }
-            }
-        }
-    }
-
-    mResourcesDictionnary.insert(std::make_pair(id, obj));
-}
-
-aiMesh *XmlSerializer::ReadMesh(XmlNode &node) {
-    if (node.empty()) {
-        return nullptr;
-    }
-
-    aiMesh *mesh = new aiMesh();
-    for (XmlNode &currentNode : node.children()) {
-        const std::string currentName = currentNode.name();
-        if (currentName == XmlTag::vertices) {
-            ImportVertices(currentNode, mesh);
-        } else if (currentName == XmlTag::triangles) {
-            ImportTriangles(currentNode, mesh);
-        }
-    }
-
-    return mesh;
-}
-
-void XmlSerializer::ReadMetadata(XmlNode &node) {
-    pugi::xml_attribute attribute = node.attribute(D3MF::XmlTag::meta_name);
-    const std::string name = attribute.as_string();
-    const std::string value = node.value();
-    if (name.empty()) {
-        return;
-    }
-
-    MetaEntry entry;
-    entry.name = name;
-    entry.value = value;
-    mMetaData.push_back(entry);
-}
-
-void XmlSerializer::ImportVertices(XmlNode &node, aiMesh *mesh) {
-    ai_assert(nullptr != mesh);
-
-    std::vector<aiVector3D> vertices;
-    for (XmlNode &currentNode : node.children()) {
-        const std::string currentName = currentNode.name();
-        if (currentName == XmlTag::vertex) {
-            vertices.push_back(ReadVertex(currentNode));
-        }
-    }
-
-    mesh->mNumVertices = static_cast<unsigned int>(vertices.size());
-    mesh->mVertices = new aiVector3D[mesh->mNumVertices];
-    std::copy(vertices.begin(), vertices.end(), mesh->mVertices);
-}
-
-void XmlSerializer::ImportTriangles(XmlNode &node, aiMesh *mesh) {
-    std::vector<aiFace> faces;
-    for (XmlNode &currentNode : node.children()) {
-        const std::string currentName = currentNode.name();
-        if (currentName == XmlTag::triangle) {
-            int pid = IdNotSet;
-            bool hasPid = getNodeAttribute(currentNode, D3MF::XmlTag::pid, pid);
-
-            int pindex[3];
-            aiFace face = ReadTriangle(currentNode, pindex[0], pindex[1], pindex[2]);
-            if (hasPid && (pindex[0] != IdNotSet || pindex[1] != IdNotSet || pindex[2] != IdNotSet)) {
-                auto it = mResourcesDictionnary.find(pid);
-                if (it != mResourcesDictionnary.end()) {
-                    if (it->second->getType() == ResourceType::RT_BaseMaterials) {
-                        BaseMaterials *baseMaterials = static_cast<BaseMaterials *>(it->second);
-
-                        auto update_material = [&](int idx) {
-                            if (pindex[idx] != IdNotSet) {
-                                mesh->mMaterialIndex = baseMaterials->mMaterialIndex[pindex[idx]];
-                            }
-                        };
-
-                        update_material(0);
-                        update_material(1);
-                        update_material(2);
-
-                    } else if (it->second->getType() == ResourceType::RT_Texture2DGroup) {
-                        // Load texture coordinates into mesh, when any
-                        Texture2DGroup *group = static_cast<Texture2DGroup *>(it->second); // fix bug
-                        if (mesh->mTextureCoords[0] == nullptr) {
-                            mesh->mNumUVComponents[0] = 2;
-                            for (unsigned int i = 1; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-                                mesh->mNumUVComponents[i] = 0;
-                            }
-
-                            const std::string name = ai_to_string(group->mTexId);
-                            for (size_t i = 0; i < mMaterials.size(); ++i) {
-                                if (name == mMaterials[i]->GetName().C_Str()) {
-                                    mesh->mMaterialIndex = static_cast<unsigned int>(i);
-                                }
-                            }
-                            mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
-                            for (unsigned int vertex_index = 0; vertex_index < mesh->mNumVertices; vertex_index++) {
-                                mesh->mTextureCoords[0][vertex_index].z = IdNotSet;//mark not set
-                            }
-                        }
-
-                        auto update_texture = [&](int idx) {
-                            if (pindex[idx] != IdNotSet) {
-                                size_t vertex_index = face.mIndices[idx];
-                                mesh->mTextureCoords[0][vertex_index] =
-                                        aiVector3D(group->mTex2dCoords[pindex[idx]].x, group->mTex2dCoords[pindex[idx]].y, 0.0f);
-                            }
-                        };
-
-                        update_texture(0);
-                        update_texture(1);
-                        update_texture(2);
-
-                    } else if (it->second->getType() == ResourceType::RT_ColorGroup) {
-                        // Load vertex color into mesh, when any
-                        ColorGroup *group = static_cast<ColorGroup *>(it->second);
-                        if (mesh->mColors[0] == nullptr) {
-                            mesh->mColors[0] = new aiColor4D[mesh->mNumVertices];
-                        }
-
-                        auto update_color = [&](int idx) {
-                            if (pindex[idx] != IdNotSet) {
-                                size_t vertex_index = face.mIndices[idx];
-                                mesh->mColors[0][vertex_index] = group->mColors[pindex[idx]];
-                            }
-                        };
-
-                        update_color(0);
-                        update_color(1);
-                        update_color(2);
-                    }
-                }
-            }
-
-            faces.push_back(face);
-        }
-    }
-
-    mesh->mNumFaces = static_cast<unsigned int>(faces.size());
-    mesh->mFaces = new aiFace[mesh->mNumFaces];
-    mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
-
-    std::copy(faces.begin(), faces.end(), mesh->mFaces);
-}
-
-void XmlSerializer::ReadBaseMaterials(XmlNode &node) {
-    int id = IdNotSet;
-    if (getNodeAttribute(node, D3MF::XmlTag::id, id)) {
-        BaseMaterials *baseMaterials = new BaseMaterials(id);
-
-        for (XmlNode &currentNode : node.children()) {
-            const std::string currentName = currentNode.name();
-            if (currentName == XmlTag::basematerials_base) {
-                baseMaterials->mMaterialIndex.push_back(static_cast<unsigned int>(mMaterials.size()));
-                mMaterials.push_back(readMaterialDef(currentNode, id));
-            }
-        }
-
-        mResourcesDictionnary.insert(std::make_pair(id, baseMaterials));
-    }
-}
-
-void XmlSerializer::ReadEmbeddecTexture(XmlNode &node) {
-    if (node.empty()) {
-        return;
-    }
-
-    std::string value;
-    EmbeddedTexture *tex2D = nullptr;
-    if (XmlParser::getStdStrAttribute(node, XmlTag::id, value)) {
-        tex2D = new EmbeddedTexture(atoi(value.c_str()));
-    }
-    if (nullptr == tex2D) {
-        return;
-    }
-
-    if (XmlParser::getStdStrAttribute(node, XmlTag::path, value)) {
-        tex2D->mPath = value;
-    }
-    if (XmlParser::getStdStrAttribute(node, XmlTag::texture_content_type, value)) {
-        tex2D->mContentType = value;
-    }
-    if (XmlParser::getStdStrAttribute(node, XmlTag::texture_tilestyleu, value)) {
-        tex2D->mTilestyleU = value;
-    }
-    if (XmlParser::getStdStrAttribute(node, XmlTag::texture_tilestylev, value)) {
-        tex2D->mTilestyleV = value;
-    }
-    mEmbeddedTextures.emplace_back(tex2D);
-    StoreEmbeddedTexture(tex2D);
-}
-
-void XmlSerializer::StoreEmbeddedTexture(EmbeddedTexture *tex) {
-    aiMaterial *mat = new aiMaterial;
-    aiString s;
-    s.Set(ai_to_string(tex->mId).c_str());
-    mat->AddProperty(&s, AI_MATKEY_NAME);
-    const std::string name = "*" + tex->mPath;
-    s.Set(name);
-    mat->AddProperty(&s, AI_MATKEY_TEXTURE_DIFFUSE(0));
-
-    aiColor3D col;
-    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_DIFFUSE);
-    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_AMBIENT);
-    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_EMISSIVE);
-    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_SPECULAR);
-    mMaterials.emplace_back(mat);
-}
-
-void XmlSerializer::ReadTextureCoords2D(XmlNode &node, Texture2DGroup *tex2DGroup) {
-    if (node.empty() || nullptr == tex2DGroup) {
-        return;
-    }
-
-    int id = IdNotSet;
-    if (XmlParser::getIntAttribute(node, "texid", id)) {
-        tex2DGroup->mTexId = id;
-    }
-
-    double value = 0.0;
-    for (XmlNode currentNode : node.children()) {
-        const std::string currentName = currentNode.name();
-        aiVector2D texCoord;
-        if (currentName == XmlTag::texture_2d_coord) {
-            XmlParser::getDoubleAttribute(currentNode, XmlTag::texture_cuurd_u, value);
-            texCoord.x = (ai_real)value;
-            XmlParser::getDoubleAttribute(currentNode, XmlTag::texture_cuurd_v, value);
-            texCoord.y = (ai_real)value;
-            tex2DGroup->mTex2dCoords.push_back(texCoord);
-        }
-    }
-}
-
-void XmlSerializer::ReadTextureGroup(XmlNode &node) {
-    if (node.empty()) {
-        return;
-    }
-
-    int id = IdNotSet;
-    if (!XmlParser::getIntAttribute(node, XmlTag::id, id)) {
-        return;
-    }
-
-    Texture2DGroup *group = new Texture2DGroup(id);
-    ReadTextureCoords2D(node, group);
-    mResourcesDictionnary.insert(std::make_pair(id, group));
-}
-
-aiMaterial *XmlSerializer::readMaterialDef(XmlNode &node, unsigned int basematerialsId) {
-    aiMaterial *material = new aiMaterial();
-    material->mNumProperties = 0;
-    std::string name;
-    bool hasName = getNodeAttribute(node, D3MF::XmlTag::basematerials_name, name);
-
-    std::string stdMaterialName;
-    const std::string strId(ai_to_string(basematerialsId));
-    stdMaterialName += "id";
-    stdMaterialName += strId;
-    stdMaterialName += "_";
-    if (hasName) {
-        stdMaterialName += name;
-    } else {
-        stdMaterialName += "basemat_";
-        stdMaterialName += ai_to_string(mMaterials.size());
-    }
-
-    aiString assimpMaterialName(stdMaterialName);
-    material->AddProperty(&assimpMaterialName, AI_MATKEY_NAME);
-
-    assignDiffuseColor(node, material);
-
-    return material;
-}
-
-void XmlSerializer::ReadColor(XmlNode &node, ColorGroup *colorGroup) {
-    if (node.empty() || nullptr == colorGroup) {
-        return;
-    }
-
-    for (XmlNode currentNode : node.children()) {
-        const std::string currentName = currentNode.name();
-        if (currentName == XmlTag::color_item) {
-            const char *color = currentNode.attribute(XmlTag::color_vaule).as_string();
-            aiColor4D color_value;
-            if (parseColor(color, color_value)) {
-                colorGroup->mColors.push_back(color_value);
-            }
-        }
-    }
-}
-
-void XmlSerializer::ReadColorGroup(XmlNode &node) {
-    if (node.empty()) {
-        return;
-    }
-
-    int id = IdNotSet;
-    if (!XmlParser::getIntAttribute(node, XmlTag::id, id)) {
-        return;
-    }
-
-    ColorGroup *group = new ColorGroup(id);
-    ReadColor(node, group);
-    mResourcesDictionnary.insert(std::make_pair(id, group));
-}
-
-void XmlSerializer::StoreMaterialsInScene(aiScene *scene) {
-    if (nullptr == scene) {
-        return;
-    }
-
-    scene->mNumMaterials = static_cast<unsigned int>(mMaterials.size());
-    if (scene->mNumMaterials == 0) {
-        return;
-    }
-
-    scene->mMaterials = new aiMaterial *[scene->mNumMaterials];
-    for (size_t i = 0; i < mMaterials.size(); ++i) {
-        scene->mMaterials[i] = mMaterials[i];
-    }
-}
-
-} // namespace D3MF
-} // namespace Assimp
--- a/code/AssetLib/3MF/XmlSerializer.h
+++ b/code/AssetLib/3MF/XmlSerializer.h
@ -1,99 +0,0 @@
-/*
-Open Asset Import Library (assimp)
----------------------------------------------------------------------
-
-Copyright (c) 2006-2024, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
----------------------------------------------------------------------
-*/
-#pragma once
-
-#include <assimp/XmlParser.h>
-#include <assimp/mesh.h>
-#include <vector>
-#include <map>
-
-struct aiNode;
-struct aiMesh;
-struct aiMaterial;
-
-namespace Assimp {
-namespace D3MF {
-
-class Resource;
-class D3MFOpcPackage;
-class Object;
-class Texture2DGroup;
-class EmbeddedTexture;
-class ColorGroup;
-
-class XmlSerializer {
-public:
-    XmlSerializer(XmlParser *xmlParser);
-    ~XmlSerializer();
-    void ImportXml(aiScene *scene);
-
-private:
-    void addObjectToNode(aiNode *parent, Object *obj, aiMatrix4x4 nodeTransform);
-    void ReadObject(XmlNode &node);
-    aiMesh *ReadMesh(XmlNode &node);
-    void ReadMetadata(XmlNode &node);
-    void ImportVertices(XmlNode &node, aiMesh *mesh);
-    void ImportTriangles(XmlNode &node, aiMesh *mesh);
-    void ReadBaseMaterials(XmlNode &node);
-    void ReadEmbeddecTexture(XmlNode &node);
-    void StoreEmbeddedTexture(EmbeddedTexture *tex);
-    void ReadTextureCoords2D(XmlNode &node, Texture2DGroup *tex2DGroup);
-    void ReadTextureGroup(XmlNode &node);
-    aiMaterial *readMaterialDef(XmlNode &node, unsigned int basematerialsId);
-    void StoreMaterialsInScene(aiScene *scene);
-    void ReadColorGroup(XmlNode &node);
-    void ReadColor(XmlNode &node, ColorGroup *colorGroup);
-
-private:
-    struct MetaEntry {
-        std::string name;
-        std::string value;
-    };
-    std::vector<MetaEntry> mMetaData;
-    std::vector<EmbeddedTexture *> mEmbeddedTextures;
-    std::vector<aiMaterial *> mMaterials;
-    std::map<unsigned int, Resource *> mResourcesDictionnary;
-    unsigned int mMeshCount;
-    XmlParser *mXmlParser;
-};
-
-} // namespace D3MF
-} // namespace Assimp
--- a/code/AssetLib/AC/ACLoader.cpp
+++ b/code/AssetLib/AC/ACLoader.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -60,9 +60,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/Importer.hpp>
 #include <memory>

-namespace Assimp {
+using namespace Assimp;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "AC3D Importer",
    "",
    "",
@ -77,8 +77,8 @@ static constexpr aiImporterDesc desc = {

 // ------------------------------------------------------------------------------------------------
 // skip to the next token
-inline const char *AcSkipToNextToken(const char *buffer, const char *end) {
-    if (!SkipSpaces(&buffer, end)) {
+inline const char *AcSkipToNextToken(const char *buffer) {
+    if (!SkipSpaces(&buffer)) {
        ASSIMP_LOG_ERROR("AC3D: Unexpected EOF/EOL");
    }
    return buffer;
@ -86,13 +86,13 @@ inline const char *AcSkipToNextToken(const char *buffer, const char *end) {

 // ------------------------------------------------------------------------------------------------
 // read a string (may be enclosed in double quotation marks). buffer must point to "
-inline const char *AcGetString(const char *buffer, const char *end, std::string &out) {
+inline const char *AcGetString(const char *buffer, std::string &out) {
    if (*buffer == '\0') {
        throw DeadlyImportError("AC3D: Unexpected EOF in string");
    }
    ++buffer;
    const char *sz = buffer;
-    while ('\"' != *buffer && buffer != end) {
+    while ('\"' != *buffer) {
        if (IsLineEnd(*buffer)) {
            ASSIMP_LOG_ERROR("AC3D: Unexpected EOF/EOL in string");
            out = "ERROR";
@ -112,8 +112,8 @@ inline const char *AcGetString(const char *buffer, const char *end, std::string
 // ------------------------------------------------------------------------------------------------
 // read 1 to n floats prefixed with an optional predefined identifier
 template <class T>
-inline const char *TAcCheckedLoadFloatArray(const char *buffer, const char *end, const char *name, size_t name_length, size_t num, T *out) {
-    buffer = AcSkipToNextToken(buffer, end);
+inline const char *TAcCheckedLoadFloatArray(const char *buffer, const char *name, size_t name_length, size_t num, T *out) {
+    buffer = AcSkipToNextToken(buffer);
    if (0 != name_length) {
        if (0 != strncmp(buffer, name, name_length) || !IsSpace(buffer[name_length])) {
            ASSIMP_LOG_ERROR("AC3D: Unexpected token. ", name, " was expected.");
@ -122,7 +122,7 @@ inline const char *TAcCheckedLoadFloatArray(const char *buffer, const char *end,
        buffer += name_length + 1;
    }
    for (unsigned int _i = 0; _i < num; ++_i) {
-        buffer = AcSkipToNextToken(buffer, end);
+        buffer = AcSkipToNextToken(buffer);
        buffer = fast_atoreal_move<float>(buffer, ((float *)out)[_i]);
    }

@ -132,7 +132,7 @@ inline const char *TAcCheckedLoadFloatArray(const char *buffer, const char *end,
 // ------------------------------------------------------------------------------------------------
 // Constructor to be privately used by Importer
 AC3DImporter::AC3DImporter() :
-        mBuffer(),
+        buffer(),
        configSplitBFCull(),
        configEvalSubdivision(),
        mNumMeshes(),
@ -146,13 +146,24 @@ AC3DImporter::AC3DImporter() :

 // ------------------------------------------------------------------------------------------------
 // Destructor, private as well
-AC3DImporter::~AC3DImporter() = default;
+AC3DImporter::~AC3DImporter() {
+    // nothing to be done here
+}

 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool AC3DImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
-    static const uint32_t tokens[] = { AI_MAKE_MAGIC("AC3D") };
-    return CheckMagicToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+bool AC3DImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const {
+    std::string extension = GetExtension(pFile);
+
+    // fixme: are acc and ac3d *really* used? Some sources say they are
+    if (extension == "ac" || extension == "ac3d" || extension == "acc") {
+        return true;
+    }
+    if (!extension.length() || checkSig) {
+        uint32_t token = AI_MAKE_MAGIC("AC3D");
+        return CheckMagicToken(pIOHandler, pFile, &token, 1, 0);
+    }
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -164,25 +175,25 @@ const aiImporterDesc *AC3DImporter::GetInfo() const {
 // ------------------------------------------------------------------------------------------------
 // Get a pointer to the next line from the file
 bool AC3DImporter::GetNextLine() {
-    SkipLine(&mBuffer.data, mBuffer.end);
-    return SkipSpaces(&mBuffer.data, mBuffer.end);
+    SkipLine(&buffer);
+    return SkipSpaces(&buffer);
 }

 // ------------------------------------------------------------------------------------------------
 // Parse an object section in an AC file
-bool AC3DImporter::LoadObjectSection(std::vector<Object> &objects) {
-    if (!TokenMatch(mBuffer.data, "OBJECT", 6))
-        return false;
+void AC3DImporter::LoadObjectSection(std::vector<Object> &objects) {
+    if (!TokenMatch(buffer, "OBJECT", 6))
+        return;

-    SkipSpaces(&mBuffer.data, mBuffer.end);
+    SkipSpaces(&buffer);

    ++mNumMeshes;

-    objects.emplace_back();
+    objects.push_back(Object());
    Object &obj = objects.back();

    aiLight *light = nullptr;
-    if (!ASSIMP_strincmp(mBuffer.data, "light", 5)) {
+    if (!ASSIMP_strincmp(buffer, "light", 5)) {
        // This is a light source. Add it to the list
        mLights->push_back(light = new aiLight());

@ -193,71 +204,65 @@ bool AC3DImporter::LoadObjectSection(std::vector<Object> &objects) {

        // Generate a default name for both the light source and the node
        // FIXME - what's the right way to print a size_t? Is 'zu' universally available? stick with the safe version.
-        light->mName.length = ::ai_snprintf(light->mName.data, AI_MAXLEN, "ACLight_%i", static_cast<unsigned int>(mLights->size()) - 1);
+        light->mName.length = ::ai_snprintf(light->mName.data, MAXLEN, "ACLight_%i", static_cast<unsigned int>(mLights->size()) - 1);
        obj.name = std::string(light->mName.data);

        ASSIMP_LOG_VERBOSE_DEBUG("AC3D: Light source encountered");
        obj.type = Object::Light;
-    } else if (!ASSIMP_strincmp(mBuffer.data, "group", 5)) {
+    } else if (!ASSIMP_strincmp(buffer, "group", 5)) {
        obj.type = Object::Group;
-    } else if (!ASSIMP_strincmp(mBuffer.data, "world", 5)) {
+    } else if (!ASSIMP_strincmp(buffer, "world", 5)) {
        obj.type = Object::World;
    } else
        obj.type = Object::Poly;
    while (GetNextLine()) {
-        if (TokenMatch(mBuffer.data, "kids", 4)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            unsigned int num = strtoul10(mBuffer.data, &mBuffer.data);
+        if (TokenMatch(buffer, "kids", 4)) {
+            SkipSpaces(&buffer);
+            unsigned int num = strtoul10(buffer, &buffer);
            GetNextLine();
            if (num) {
                // load the children of this object recursively
                obj.children.reserve(num);
-                for (unsigned int i = 0; i < num; ++i) {
-                    if (!LoadObjectSection(obj.children)) {
-                        ASSIMP_LOG_WARN("AC3D: wrong number of kids");
-                        break;
+                for (unsigned int i = 0; i < num; ++i)
+                    LoadObjectSection(obj.children);
            }
-                }
-            }
-            return true;
-        } else if (TokenMatch(mBuffer.data, "name", 4)) {
-            SkipSpaces(&mBuffer.data, mBuffer.data);
-            mBuffer.data = AcGetString(mBuffer.data, mBuffer.end, obj.name);
+            return;
+        } else if (TokenMatch(buffer, "name", 4)) {
+            SkipSpaces(&buffer);
+            buffer = AcGetString(buffer, obj.name);

            // If this is a light source, we'll also need to store
            // the name of the node in it.
            if (light) {
                light->mName.Set(obj.name);
            }
-        } else if (TokenMatch(mBuffer.data, "texture", 7)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            std::string texture;
-            mBuffer.data = AcGetString(mBuffer.data, mBuffer.end, texture);
-            obj.textures.push_back(texture);
-        } else if (TokenMatch(mBuffer.data, "texrep", 6)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "", 0, 2, &obj.texRepeat);
+        } else if (TokenMatch(buffer, "texture", 7)) {
+            SkipSpaces(&buffer);
+            buffer = AcGetString(buffer, obj.texture);
+        } else if (TokenMatch(buffer, "texrep", 6)) {
+            SkipSpaces(&buffer);
+            buffer = TAcCheckedLoadFloatArray(buffer, "", 0, 2, &obj.texRepeat);
            if (!obj.texRepeat.x || !obj.texRepeat.y)
                obj.texRepeat = aiVector2D(1.f, 1.f);
-        } else if (TokenMatch(mBuffer.data, "texoff", 6)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "", 0, 2, &obj.texOffset);
-        } else if (TokenMatch(mBuffer.data, "rot", 3)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "", 0, 9, &obj.rotation);
-        } else if (TokenMatch(mBuffer.data, "loc", 3)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "", 0, 3, &obj.translation);
-        } else if (TokenMatch(mBuffer.data, "subdiv", 6)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            obj.subDiv = strtoul10(mBuffer.data, &mBuffer.data);
-        } else if (TokenMatch(mBuffer.data, "crease", 6)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
-            obj.crease = fast_atof(mBuffer.data);
-        } else if (TokenMatch(mBuffer.data, "numvert", 7)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
+        } else if (TokenMatch(buffer, "texoff", 6)) {
+            SkipSpaces(&buffer);
+            buffer = TAcCheckedLoadFloatArray(buffer, "", 0, 2, &obj.texOffset);
+        } else if (TokenMatch(buffer, "rot", 3)) {
+            SkipSpaces(&buffer);
+            buffer = TAcCheckedLoadFloatArray(buffer, "", 0, 9, &obj.rotation);
+        } else if (TokenMatch(buffer, "loc", 3)) {
+            SkipSpaces(&buffer);
+            buffer = TAcCheckedLoadFloatArray(buffer, "", 0, 3, &obj.translation);
+        } else if (TokenMatch(buffer, "subdiv", 6)) {
+            SkipSpaces(&buffer);
+            obj.subDiv = strtoul10(buffer, &buffer);
+        } else if (TokenMatch(buffer, "crease", 6)) {
+            SkipSpaces(&buffer);
+            obj.crease = fast_atof(buffer);
+        } else if (TokenMatch(buffer, "numvert", 7)) {
+            SkipSpaces(&buffer);

-            unsigned int t = strtoul10(mBuffer.data, &mBuffer.data);
+            unsigned int t = strtoul10(buffer, &buffer);
            if (t >= AI_MAX_ALLOC(aiVector3D)) {
                throw DeadlyImportError("AC3D: Too many vertices, would run out of memory");
            }
@ -266,59 +271,59 @@ bool AC3DImporter::LoadObjectSection(std::vector<Object> &objects) {
                if (!GetNextLine()) {
                    ASSIMP_LOG_ERROR("AC3D: Unexpected EOF: not all vertices have been parsed yet");
                    break;
-                } else if (!IsNumeric(*mBuffer.data)) {
+                } else if (!IsNumeric(*buffer)) {
                    ASSIMP_LOG_ERROR("AC3D: Unexpected token: not all vertices have been parsed yet");
-                    --mBuffer.data; // make sure the line is processed a second time
+                    --buffer; // make sure the line is processed a second time
                    break;
                }
-                obj.vertices.emplace_back();
+                obj.vertices.push_back(aiVector3D());
                aiVector3D &v = obj.vertices.back();
-                mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "", 0, 3, &v.x);
+                buffer = TAcCheckedLoadFloatArray(buffer, "", 0, 3, &v.x);
            }
-        } else if (TokenMatch(mBuffer.data, "numsurf", 7)) {
-            SkipSpaces(&mBuffer.data, mBuffer.end);
+        } else if (TokenMatch(buffer, "numsurf", 7)) {
+            SkipSpaces(&buffer);

            bool Q3DWorkAround = false;

-            const unsigned int t = strtoul10(mBuffer.data, &mBuffer.data);
+            const unsigned int t = strtoul10(buffer, &buffer);
            obj.surfaces.reserve(t);
            for (unsigned int i = 0; i < t; ++i) {
                GetNextLine();
-                if (!TokenMatch(mBuffer.data, "SURF", 4)) {
+                if (!TokenMatch(buffer, "SURF", 4)) {
                    // FIX: this can occur for some files - Quick 3D for
                    // example writes no surf chunks
                    if (!Q3DWorkAround) {
                        ASSIMP_LOG_WARN("AC3D: SURF token was expected");
                        ASSIMP_LOG_VERBOSE_DEBUG("Continuing with Quick3D Workaround enabled");
                    }
-                    --mBuffer.data; // make sure the line is processed a second time
+                    --buffer; // make sure the line is processed a second time
                    // break; --- see fix notes above

                    Q3DWorkAround = true;
                }
-                SkipSpaces(&mBuffer.data, mBuffer.end);
-                obj.surfaces.emplace_back();
+                SkipSpaces(&buffer);
+                obj.surfaces.push_back(Surface());
                Surface &surf = obj.surfaces.back();
-                surf.flags = strtoul_cppstyle(mBuffer.data);
+                surf.flags = strtoul_cppstyle(buffer);

-                while (true) {
+                while (1) {
                    if (!GetNextLine()) {
                        throw DeadlyImportError("AC3D: Unexpected EOF: surface is incomplete");
                    }
-                    if (TokenMatch(mBuffer.data, "mat", 3)) {
-                        SkipSpaces(&mBuffer.data, mBuffer.end);
-                        surf.mat = strtoul10(mBuffer.data);
-                    } else if (TokenMatch(mBuffer.data, "refs", 4)) {
+                    if (TokenMatch(buffer, "mat", 3)) {
+                        SkipSpaces(&buffer);
+                        surf.mat = strtoul10(buffer);
+                    } else if (TokenMatch(buffer, "refs", 4)) {
                        // --- see fix notes above
                        if (Q3DWorkAround) {
                            if (!surf.entries.empty()) {
-                                mBuffer.data -= 6;
+                                buffer -= 6;
                                break;
                            }
                        }

-                        SkipSpaces(&mBuffer.data, mBuffer.end);
-                        const unsigned int m = strtoul10(mBuffer.data);
+                        SkipSpaces(&buffer);
+                        const unsigned int m = strtoul10(buffer);
                        surf.entries.reserve(m);

                        obj.numRefs += m;
@ -328,15 +333,15 @@ bool AC3DImporter::LoadObjectSection(std::vector<Object> &objects) {
                                ASSIMP_LOG_ERROR("AC3D: Unexpected EOF: surface references are incomplete");
                                break;
                            }
-                            surf.entries.emplace_back();
+                            surf.entries.push_back(Surface::SurfaceEntry());
                            Surface::SurfaceEntry &entry = surf.entries.back();

-                            entry.first = strtoul10(mBuffer.data, &mBuffer.data);
-                            SkipSpaces(&mBuffer.data, mBuffer.end);
-                            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "", 0, 2, &entry.second);
+                            entry.first = strtoul10(buffer, &buffer);
+                            SkipSpaces(&buffer);
+                            buffer = TAcCheckedLoadFloatArray(buffer, "", 0, 2, &entry.second);
                        }
                    } else {
-                        --mBuffer.data; // make sure the line is processed a second time
+                        --buffer; // make sure the line is processed a second time
                        break;
                    }
                }
@ -344,7 +349,6 @@ bool AC3DImporter::LoadObjectSection(std::vector<Object> &objects) {
        }
    }
    ASSIMP_LOG_ERROR("AC3D: Unexpected EOF: \'kids\' line was expected");
-    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -358,8 +362,8 @@ void AC3DImporter::ConvertMaterial(const Object &object,
        s.Set(matSrc.name);
        matDest.AddProperty(&s, AI_MATKEY_NAME);
    }
-    if (!object.textures.empty()) {
-        s.Set(object.textures[0]);
+    if (object.texture.length()) {
+        s.Set(object.texture);
        matDest.AddProperty(&s, AI_MATKEY_TEXTURE_DIFFUSE(0));

        // UV transformation
@ -450,7 +454,7 @@ aiNode *AC3DImporter::ConvertObjectSection(Object &object,
                    idx = 0;
                }
                if ((*it).entries.empty()) {
-                    ASSIMP_LOG_WARN("AC3D: surface has zero vertex references");
+                    ASSIMP_LOG_WARN("AC3D: surface her zero vertex references");
                }

                // validate all vertex indices to make sure we won't crash here
@ -468,15 +472,16 @@ aiNode *AC3DImporter::ConvertObjectSection(Object &object,
                }

                switch ((*it).GetType()) {
-                case Surface::ClosedLine: // closed line
-                    needMat[idx].first += static_cast<unsigned int>((*it).entries.size());
-                    needMat[idx].second += static_cast<unsigned int>((*it).entries.size() << 1u);
+                    // closed line
+                case Surface::ClosedLine:
+                    needMat[idx].first += (unsigned int)(*it).entries.size();
+                    needMat[idx].second += (unsigned int)(*it).entries.size() << 1u;
                    break;

                    // unclosed line
                case Surface::OpenLine:
-                    needMat[idx].first += static_cast<unsigned int>((*it).entries.size() - 1);
-                    needMat[idx].second += static_cast<unsigned int>(((*it).entries.size() - 1) << 1u);
+                    needMat[idx].first += (unsigned int)(*it).entries.size() - 1;
+                    needMat[idx].second += ((unsigned int)(*it).entries.size() - 1) << 1u;
                    break;

                    // triangle strip
@ -538,7 +543,7 @@ aiNode *AC3DImporter::ConvertObjectSection(Object &object,
                // allocate UV coordinates, but only if the texture name for the
                // surface is not empty
                aiVector3D *uv = nullptr;
-                if (!object.textures.empty()) {
+                if (object.texture.length()) {
                    uv = mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
                    mesh->mNumUVComponents[0] = 2;
                }
@ -578,6 +583,15 @@ aiNode *AC3DImporter::ConvertObjectSection(Object &object,
                                const Surface::SurfaceEntry &entry2 = src.entries[i + 1];
                                const Surface::SurfaceEntry &entry3 = src.entries[i + 2];

+                                // skip degenerate triangles
+                                if (object.vertices[entry1.first] == object.vertices[entry2.first] ||
+                                        object.vertices[entry1.first] == object.vertices[entry3.first] ||
+                                        object.vertices[entry2.first] == object.vertices[entry3.first]) {
+                                    mesh->mNumFaces--;
+                                    mesh->mNumVertices -= 3;
+                                    continue;
+                                }
+
                                aiFace &face = *faces++;
                                face.mNumIndices = 3;
                                face.mIndices = new unsigned int[face.mNumIndices];
@ -696,18 +710,18 @@ aiNode *AC3DImporter::ConvertObjectSection(Object &object,
        // generate a name depending on the type of the node
        switch (object.type) {
        case Object::Group:
-            node->mName.length = ::ai_snprintf(node->mName.data, AI_MAXLEN, "ACGroup_%i", mGroupsCounter++);
+            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACGroup_%i", mGroupsCounter++);
            break;
        case Object::Poly:
-            node->mName.length = ::ai_snprintf(node->mName.data, AI_MAXLEN, "ACPoly_%i", mPolysCounter++);
+            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACPoly_%i", mPolysCounter++);
            break;
        case Object::Light:
-            node->mName.length = ::ai_snprintf(node->mName.data, AI_MAXLEN, "ACLight_%i", mLightsCounter++);
+            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACLight_%i", mLightsCounter++);
            break;

            // there shouldn't be more than one world, but we don't care
        case Object::World:
-            node->mName.length = ::ai_snprintf(node->mName.data, AI_MAXLEN, "ACWorld_%i", mWorldsCounter++);
+            node->mName.length = ::ai_snprintf(node->mName.data, MAXLEN, "ACWorld_%i", mWorldsCounter++);
            break;
        }
    }
@ -747,7 +761,7 @@ void AC3DImporter::InternReadFile(const std::string &pFile,
    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file
-    if (file == nullptr) {
+    if (file.get() == nullptr) {
        throw DeadlyImportError("Failed to open AC3D file ", pFile, ".");
    }

@ -755,18 +769,17 @@ void AC3DImporter::InternReadFile(const std::string &pFile,
    std::vector<char> mBuffer2;
    TextFileToBuffer(file.get(), mBuffer2);

-    mBuffer.data = &mBuffer2[0];
-    mBuffer.end = &mBuffer2[0] + mBuffer2.size();
+    buffer = &mBuffer2[0];
    mNumMeshes = 0;

    mLightsCounter = mPolysCounter = mWorldsCounter = mGroupsCounter = 0;

-    if (::strncmp(mBuffer.data, "AC3D", 4)) {
+    if (::strncmp(buffer, "AC3D", 4)) {
        throw DeadlyImportError("AC3D: No valid AC3D file, magic sequence not found");
    }

    // print the file format version to the console
-    unsigned int version = HexDigitToDecimal(mBuffer.data[4]);
+    unsigned int version = HexDigitToDecimal(buffer[4]);
    char msg[3];
    ASSIMP_itoa10(msg, 3, version);
    ASSIMP_LOG_INFO("AC3D file format version: ", msg);
@ -781,36 +794,35 @@ void AC3DImporter::InternReadFile(const std::string &pFile,
    mLights = &lights;

    while (GetNextLine()) {
-        if (TokenMatch(mBuffer.data, "MATERIAL", 8)) {
-            materials.emplace_back();
+        if (TokenMatch(buffer, "MATERIAL", 8)) {
+            materials.push_back(Material());
            Material &mat = materials.back();

            // manually parse the material ... sscanf would use the buldin atof ...
            // Format: (name) rgb %f %f %f  amb %f %f %f  emis %f %f %f  spec %f %f %f  shi %d  trans %f

-            mBuffer.data = AcSkipToNextToken(mBuffer.data, mBuffer.end);
-            if ('\"' == *mBuffer.data) {
-                mBuffer.data = AcGetString(mBuffer.data, mBuffer.end, mat.name);
-                mBuffer.data = AcSkipToNextToken(mBuffer.data, mBuffer.end);
+            buffer = AcSkipToNextToken(buffer);
+            if ('\"' == *buffer) {
+                buffer = AcGetString(buffer, mat.name);
+                buffer = AcSkipToNextToken(buffer);
            }

-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "rgb", 3, 3, &mat.rgb);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "amb", 3, 3, &mat.amb);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "emis", 4, 3, &mat.emis);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "spec", 4, 3, &mat.spec);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "shi", 3, 1, &mat.shin);
-            mBuffer.data = TAcCheckedLoadFloatArray(mBuffer.data, mBuffer.end, "trans", 5, 1, &mat.trans);
-        } else {
+            buffer = TAcCheckedLoadFloatArray(buffer, "rgb", 3, 3, &mat.rgb);
+            buffer = TAcCheckedLoadFloatArray(buffer, "amb", 3, 3, &mat.amb);
+            buffer = TAcCheckedLoadFloatArray(buffer, "emis", 4, 3, &mat.emis);
+            buffer = TAcCheckedLoadFloatArray(buffer, "spec", 4, 3, &mat.spec);
+            buffer = TAcCheckedLoadFloatArray(buffer, "shi", 3, 1, &mat.shin);
+            buffer = TAcCheckedLoadFloatArray(buffer, "trans", 5, 1, &mat.trans);
+        }
        LoadObjectSection(rootObjects);
    }
-    }

-    if (rootObjects.empty() || mNumMeshes == 0u) {
+    if (rootObjects.empty() || !mNumMeshes) {
        throw DeadlyImportError("AC3D: No meshes have been loaded");
    }
    if (materials.empty()) {
        ASSIMP_LOG_WARN("AC3D: No material has been found");
-        materials.emplace_back();
+        materials.push_back(Material());
    }

    mNumMeshes += (mNumMeshes >> 2u) + 1;
@ -821,7 +833,7 @@ void AC3DImporter::InternReadFile(const std::string &pFile,
    materials.reserve(mNumMeshes);

    // generate a dummy root if there are multiple objects on the top layer
-    Object *root = nullptr;
+    Object *root;
    if (1 == rootObjects.size())
        root = &rootObjects[0];
    else {
@ -834,7 +846,7 @@ void AC3DImporter::InternReadFile(const std::string &pFile,
        delete root;
    }

-    if (::strncmp(pScene->mRootNode->mName.data, "Node", 4) == 0) {
+    if (!::strncmp(pScene->mRootNode->mName.data, "Node", 4)) {
        pScene->mRootNode->mName.Set("<AC3DWorld>");
    }

@ -853,12 +865,10 @@ void AC3DImporter::InternReadFile(const std::string &pFile,

    // copy lights
    pScene->mNumLights = (unsigned int)lights.size();
-    if (!lights.empty()) {
+    if (lights.size()) {
        pScene->mLights = new aiLight *[lights.size()];
        ::memcpy(pScene->mLights, &lights[0], lights.size() * sizeof(void *));
    }
 }

-} // namespace Assimp
-
 #endif //!defined ASSIMP_BUILD_NO_AC_IMPORTER
--- a/code/AssetLib/AC/ACLoader.h
+++ b/code/AssetLib/AC/ACLoader.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -63,7 +63,7 @@ namespace Assimp {
 class AC3DImporter : public BaseImporter {
 public:
    AC3DImporter();
-    ~AC3DImporter() override;
+    ~AC3DImporter();

    // Represents an AC3D material
    struct Material {
@ -125,6 +125,7 @@ public:
                type(World),
                name(),
                children(),
+                texture(),
                texRepeat(1.f, 1.f),
                texOffset(0.0f, 0.0f),
                rotation(),
@ -150,8 +151,7 @@ public:
        std::vector<Object> children;

        // texture to be assigned to all surfaces of the object
-        // the .acc format supports up to 4 textures
-        std::vector<std::string> textures;
+        std::string texture;

        // texture repat factors (scaling for all coordinates)
        aiVector2D texRepeat, texOffset;
@ -185,25 +185,25 @@ public:
     * See BaseImporter::CanRead() for details.
     */
    bool CanRead(const std::string &pFile, IOSystem *pIOHandler,
-            bool checkSig) const override;
+            bool checkSig) const;

 protected:
    // -------------------------------------------------------------------
    /** Return importer meta information.
     * See #BaseImporter::GetInfo for the details */
-    const aiImporterDesc *GetInfo() const override;
+    const aiImporterDesc *GetInfo() const;

    // -------------------------------------------------------------------
    /** Imports the given file into the given scene structure.
     * See BaseImporter::InternReadFile() for details*/
    void InternReadFile(const std::string &pFile, aiScene *pScene,
-            IOSystem *pIOHandler) override;
+            IOSystem *pIOHandler);

    // -------------------------------------------------------------------
    /** Called prior to ReadFile().
    * The function is a request to the importer to update its configuration
    * basing on the Importer's configuration property list.*/
-    void SetupProperties(const Importer *pImp) override;
+    void SetupProperties(const Importer *pImp);

 private:
    // -------------------------------------------------------------------
@ -216,7 +216,7 @@ private:
     *  load subobjects, the method returns after a 'kids 0' was
     *  encountered.
     *  @objects List of output objects*/
-    bool LoadObjectSection(std::vector<Object> &objects);
+    void LoadObjectSection(std::vector<Object> &objects);

    // -------------------------------------------------------------------
    /** Convert all objects into meshes and nodes.
@ -242,7 +242,7 @@ private:

 private:
    // points to the next data line
-    aiBuffer mBuffer;
+    const char *buffer;

    // Configuration option: if enabled, up to two meshes
    // are generated per material: those faces who have
--- a/code/AssetLib/AMF/AMFImporter.cpp
+++ b/code/AssetLib/AMF/AMFImporter.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -53,7 +53,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 namespace Assimp {

-static constexpr aiImporterDesc Description = {
+const aiImporterDesc AMFImporter::Description = {
    "Additive manufacturing file format(AMF) Importer",
    "smalcom",
    "",
@ -83,7 +83,11 @@ void AMFImporter::Clear() {

 AMFImporter::AMFImporter() AI_NO_EXCEPT :
        mNodeElement_Cur(nullptr),
-        mXmlParser(nullptr) {
+        mXmlParser(nullptr),
+        mUnit(),
+        mVersion(),
+        mMaterial_Converted(),
+        mTexture_Converted() {
    // empty
 }

@ -178,6 +182,28 @@ bool AMFImporter::XML_SearchNode(const std::string &nodeName) {
    return nullptr != mXmlParser->findNode(nodeName);
 }

+void AMFImporter::ParseHelper_FixTruncatedFloatString(const char *pInStr, std::string &pOutString) {
+    size_t instr_len;
+
+    pOutString.clear();
+    instr_len = strlen(pInStr);
+    if (!instr_len) return;
+
+    pOutString.reserve(instr_len * 3 / 2);
+    // check and correct floats in format ".x". Must be "x.y".
+    if (pInStr[0] == '.') pOutString.push_back('0');
+
+    pOutString.push_back(pInStr[0]);
+    for (size_t ci = 1; ci < instr_len; ci++) {
+        if ((pInStr[ci] == '.') && ((pInStr[ci - 1] == ' ') || (pInStr[ci - 1] == '-') || (pInStr[ci - 1] == '+') || (pInStr[ci - 1] == '\t'))) {
+            pOutString.push_back('0');
+            pOutString.push_back('.');
+        } else {
+            pOutString.push_back(pInStr[ci]);
+        }
+    }
+}
+
 static bool ParseHelper_Decode_Base64_IsBase64(const char pChar) {
    return (isalnum((unsigned char)pChar) || (pChar == '+') || (pChar == '/'));
 }
@ -191,10 +217,7 @@ void AMFImporter::ParseHelper_Decode_Base64(const std::string &pInputBase64, std
    uint8_t arr4[4], arr3[3];

    // check input data
-    if (pInputBase64.size() % 4) {
-        throw DeadlyImportError("Base64-encoded data must have size multiply of four.");
-    }
-
+    if (pInputBase64.size() % 4) throw DeadlyImportError("Base64-encoded data must have size multiply of four.");
    // prepare output place
    pOutputData.clear();
    pOutputData.reserve(pInputBase64.size() / 4 * 3);
@ -238,7 +261,7 @@ void AMFImporter::ParseFile(const std::string &pFile, IOSystem *pIOHandler) {
    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file
-    if (file == nullptr) {
+    if (file.get() == nullptr) {
        throw DeadlyImportError("Failed to open AMF file ", pFile, ".");
    }

@ -384,17 +407,17 @@ void AMFImporter::ParseNode_Instance(XmlNode &node) {
        for (auto &currentNode : node.children()) {
            const std::string &currentName = currentNode.name();
            if (currentName == "deltax") {
-                XmlParser::getValueAsReal(currentNode, als.Delta.x);
+                XmlParser::getValueAsFloat(currentNode, als.Delta.x);
            } else if (currentName == "deltay") {
-                XmlParser::getValueAsReal(currentNode, als.Delta.y);
+                XmlParser::getValueAsFloat(currentNode, als.Delta.y);
            } else if (currentName == "deltaz") {
-                XmlParser::getValueAsReal(currentNode, als.Delta.z);
+                XmlParser::getValueAsFloat(currentNode, als.Delta.z);
            } else if (currentName == "rx") {
-                XmlParser::getValueAsReal(currentNode, als.Delta.x);
+                XmlParser::getValueAsFloat(currentNode, als.Delta.x);
            } else if (currentName == "ry") {
-                XmlParser::getValueAsReal(currentNode, als.Delta.y);
+                XmlParser::getValueAsFloat(currentNode, als.Delta.y);
            } else if (currentName == "rz") {
-                XmlParser::getValueAsReal(currentNode, als.Delta.z);
+                XmlParser::getValueAsFloat(currentNode, als.Delta.z);
            }
        }
        ParseHelper_Node_Exit();
@ -480,9 +503,19 @@ void AMFImporter::ParseNode_Metadata(XmlNode &node) {
    mNodeElement_List.push_back(ne); // and to node element list because its a new object in graph.
 }

-bool AMFImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*pCheckSig*/) const {
-    static const char *tokens[] = { "<amf" };
-    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+bool AMFImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool pCheckSig) const {
+    const std::string extension = GetExtension(pFile);
+
+    if (extension == "amf") {
+        return true;
+    }
+
+    if (extension.empty() || pCheckSig) {
+        const char *tokens[] = { "<amf" };
+        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 1);
+    }
+
+    return false;
 }

 const aiImporterDesc *AMFImporter::GetInfo() const {
--- a/code/AssetLib/AMF/AMFImporter.hpp
+++ b/code/AssetLib/AMF/AMFImporter.hpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -98,12 +98,8 @@ namespace Assimp {
 ///            old - <map> and children <u1>, <u2>, <u3>, <v1>, <v2>, <v3>
 ///
 class AMFImporter : public BaseImporter {
-    using AMFMetaDataArray = std::vector<AMFMetadata *>;
-    using MeshArray = std::vector<aiMesh *>;
-    using NodeArray = std::vector<aiNode *>;
-
-public:
-    struct SPP_Material;
+private:
+    struct SPP_Material; // forward declaration

    /// Data type for post-processing step. More suitable container for part of material's composition.
    struct SPP_Composite {
@ -111,6 +107,22 @@ public:
        std::string Formula; ///< Formula for calculating ratio of \ref Material.
    };

+    /// \struct SPP_Material
+    /// Data type for post-processing step. More suitable container for material.
+    struct SPP_Material {
+        std::string ID; ///< Material ID.
+        std::list<AMFMetadata *> Metadata; ///< Metadata of material.
+        AMFColor *Color; ///< Color of material.
+        std::list<SPP_Composite> Composition; ///< List of child materials if current material is composition of few another.
+
+        /// Return color calculated for specified coordinate.
+        /// \param [in] pX - "x" coordinate.
+        /// \param [in] pY - "y" coordinate.
+        /// \param [in] pZ - "z" coordinate.
+        /// \return calculated color.
+        aiColor4D GetColor(const float pX, const float pY, const float pZ) const;
+    };
+
    /// Data type for post-processing step. More suitable container for texture.
    struct SPP_Texture {
        std::string ID;
@ -127,51 +139,10 @@ public:
        const AMFTexMap *TexMap; ///< Face texture mapping data. Equal to nullptr if texture mapping is not set for the face.
    };

-    /// Data type for post-processing step. More suitable container for material.
-    struct SPP_Material {
-        std::string ID; ///< Material ID.
-        std::list<AMFMetadata *> Metadata; ///< Metadata of material.
-        AMFColor *Color; ///< Color of material.
-        std::list<SPP_Composite> Composition; ///< List of child materials if current material is composition of few another.
+    using AMFMetaDataArray = std::vector<AMFMetadata*>;
+    using MeshArray = std::vector<aiMesh*>;
+    using NodeArray = std::vector<aiNode*>;

-        /// Return color calculated for specified coordinate.
-        /// \param [in] pX - "x" coordinate.
-        /// \param [in] pY - "y" coordinate.
-        /// \param [in] pZ - "z" coordinate.
-        /// \return calculated color.
-        aiColor4D GetColor(const float pX, const float pY, const float pZ) const;
-    };
-
-    /// Default constructor.
-    AMFImporter() AI_NO_EXCEPT;
-
-    /// Default destructor.
-    ~AMFImporter() override;
-
-    /// Parse AMF file and fill scene graph. The function has no return value. Result can be found by analyzing the generated graph.
-    /// Also exception can be thrown if trouble will found.
-    /// \param [in] pFile - name of file to be parsed.
-    /// \param [in] pIOHandler - pointer to IO helper object.
-    void ParseFile(const std::string &pFile, IOSystem *pIOHandler);
-    void ParseHelper_Node_Enter(AMFNodeElementBase *child);
-    void ParseHelper_Node_Exit();
-    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool pCheckSig) const override;
-    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;
-    const aiImporterDesc *GetInfo() const override;
-    bool Find_NodeElement(const std::string &pID, const AMFNodeElementBase::EType pType, AMFNodeElementBase **pNodeElement) const;
-    bool Find_ConvertedNode(const std::string &pID, NodeArray &nodeArray, aiNode **pNode) const;
-    bool Find_ConvertedMaterial(const std::string &pID, const SPP_Material **pConvertedMaterial) const;
-    AI_WONT_RETURN void Throw_CloseNotFound(const std::string &nodeName) AI_WONT_RETURN_SUFFIX;
-    AI_WONT_RETURN void Throw_IncorrectAttr(const std::string &nodeName, const std::string &pAttrName) AI_WONT_RETURN_SUFFIX;
-    AI_WONT_RETURN void Throw_IncorrectAttrValue(const std::string &nodeName, const std::string &pAttrName) AI_WONT_RETURN_SUFFIX;
-    AI_WONT_RETURN void Throw_MoreThanOnceDefined(const std::string &nodeName, const std::string &pNodeType, const std::string &pDescription) AI_WONT_RETURN_SUFFIX;
-    AI_WONT_RETURN void Throw_ID_NotFound(const std::string &pID) const AI_WONT_RETURN_SUFFIX;
-    void XML_CheckNode_MustHaveChildren(pugi::xml_node &node);
-    bool XML_SearchNode(const std::string &nodeName);
-    AMFImporter(const AMFImporter &pScene) = delete;
-    AMFImporter &operator=(const AMFImporter &pScene) = delete;
-
-private:
    /// Clear all temporary data.
    void Clear();

@ -291,9 +262,40 @@ private:
    /// \param [in] pUseOldName - if true then use old name of node(and children) - <map>, instead of new name - <texmap>.
    void ParseNode_TexMap(XmlNode &node, const bool pUseOldName = false);

+public:
+    /// Default constructor.
+    AMFImporter() AI_NO_EXCEPT;

+    /// Default destructor.
+    ~AMFImporter();
+
+    /// Parse AMF file and fill scene graph. The function has no return value. Result can be found by analyzing the generated graph.
+    /// Also exception can be thrown if trouble will found.
+    /// \param [in] pFile - name of file to be parsed.
+    /// \param [in] pIOHandler - pointer to IO helper object.
+    void ParseFile(const std::string &pFile, IOSystem *pIOHandler);
+    void ParseHelper_Node_Enter(AMFNodeElementBase *child);
+    void ParseHelper_Node_Exit();
+    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool pCheckSig) const;
+    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler);
+    const aiImporterDesc *GetInfo() const;
+    bool Find_NodeElement(const std::string &pID, const AMFNodeElementBase::EType pType, AMFNodeElementBase **pNodeElement) const;
+    bool Find_ConvertedNode(const std::string &pID, NodeArray &nodeArray, aiNode **pNode) const;
+    bool Find_ConvertedMaterial(const std::string &pID, const SPP_Material **pConvertedMaterial) const;
+    void Throw_CloseNotFound(const std::string &nodeName);
+    void Throw_IncorrectAttr(const std::string &nodeName, const std::string &pAttrName);
+    void Throw_IncorrectAttrValue(const std::string &nodeName, const std::string &pAttrName);
+    void Throw_MoreThanOnceDefined(const std::string &nodeName, const std::string &pNodeType, const std::string &pDescription);
+    void Throw_ID_NotFound(const std::string &pID) const;
+    void XML_CheckNode_MustHaveChildren(pugi::xml_node &node);
+    bool XML_SearchNode(const std::string &nodeName);
+    void ParseHelper_FixTruncatedFloatString(const char *pInStr, std::string &pOutString);
+    AMFImporter(const AMFImporter &pScene) = delete;
+    AMFImporter &operator=(const AMFImporter &pScene) = delete;

 private:
+    static const aiImporterDesc Description;
+
    AMFNodeElementBase *mNodeElement_Cur; ///< Current element.
    std::list<AMFNodeElementBase *> mNodeElement_List; ///< All elements of scene graph.
    XmlParser *mXmlParser;
--- a/code/AssetLib/AMF/AMFImporter_Geometry.cpp
+++ b/code/AssetLib/AMF/AMFImporter_Geometry.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -167,11 +167,11 @@ void AMFImporter::ParseNode_Coordinates(XmlNode &node) {
            AMFCoordinates &als = *((AMFCoordinates *)ne); // alias for convenience
            const std::string &currentName = ai_tolower(currentNode.name());
            if (currentName == "x") {
-                XmlParser::getValueAsReal(currentNode, als.Coordinate.x);
+                XmlParser::getValueAsFloat(currentNode, als.Coordinate.x);
            } else if (currentName == "y") {
-                XmlParser::getValueAsReal(currentNode, als.Coordinate.y);
+                XmlParser::getValueAsFloat(currentNode, als.Coordinate.y);
            } else if (currentName == "z") {
-                XmlParser::getValueAsReal(currentNode, als.Coordinate.z);
+                XmlParser::getValueAsFloat(currentNode, als.Coordinate.z);
            }
        }
        ParseHelper_Node_Exit();
--- a/code/AssetLib/AMF/AMFImporter_Material.cpp
+++ b/code/AssetLib/AMF/AMFImporter_Material.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -263,25 +263,26 @@ void AMFImporter::ParseNode_TexMap(XmlNode &node, const bool pUseOldName) {
            const std::string &name = currentNode.name();
            if (name == "utex1") {
 				read_flag[0] = true;
-                XmlParser::getValueAsReal(node, als.TextureCoordinate[0].x);
+                XmlParser::getValueAsFloat(node, als.TextureCoordinate[0].x);
            } else if (name == "utex2") {
 				read_flag[1] = true;
-                XmlParser::getValueAsReal(node, als.TextureCoordinate[1].x);
+                XmlParser::getValueAsFloat(node, als.TextureCoordinate[1].x);
            } else if (name == "utex3") {
 				read_flag[2] = true;
-                XmlParser::getValueAsReal(node, als.TextureCoordinate[2].x);
+                XmlParser::getValueAsFloat(node, als.TextureCoordinate[2].x);
            } else if (name == "vtex1") {
 				read_flag[3] = true;
-                XmlParser::getValueAsReal(node, als.TextureCoordinate[0].y);
+                XmlParser::getValueAsFloat(node, als.TextureCoordinate[0].y);
            } else if (name == "vtex2") {
 				read_flag[4] = true;
-                XmlParser::getValueAsReal(node, als.TextureCoordinate[1].y);
+                XmlParser::getValueAsFloat(node, als.TextureCoordinate[1].y);
            } else if (name == "vtex3") {
 				read_flag[5] = true;
-                XmlParser::getValueAsReal(node, als.TextureCoordinate[2].y);
+                XmlParser::getValueAsFloat(node, als.TextureCoordinate[2].y);
 			}
 		}
        ParseHelper_Node_Exit();
+
 	} else {
 		for (pugi::xml_attribute &attr : node.attributes()) {
            const std::string name = attr.name();
--- a/code/AssetLib/AMF/AMFImporter_Node.hpp
+++ b/code/AssetLib/AMF/AMFImporter_Node.hpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -48,14 +48,16 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef INCLUDED_AI_AMF_IMPORTER_NODE_H
 #define INCLUDED_AI_AMF_IMPORTER_NODE_H

-// Header files, Assimp.
-#include <assimp/scene.h>
-#include <assimp/types.h>
-
+// Header files, stdlib.
 #include <list>
 #include <string>
 #include <vector>

+// Header files, Assimp.
+#include "assimp/scene.h"
+#include "assimp/types.h"
+
+/// \class CAMFImporter_NodeElement
 /// Base class for elements of nodes.
 class AMFNodeElementBase {
 public:
@ -87,7 +89,9 @@ public:
 	std::list<AMFNodeElementBase *> Child; ///< Child elements.

 public: /// Destructor, virtual..
-	virtual ~AMFNodeElementBase() = default;
+	virtual ~AMFNodeElementBase() {
+		// empty
+	}

 	/// Disabled copy constructor and co.
 	AMFNodeElementBase(const AMFNodeElementBase &pNodeElement) = delete;
@ -100,11 +104,12 @@ protected:
 	/// \param [in] pType - element type.
 	/// \param [in] pParent - parent element.
 	AMFNodeElementBase(const EType pType, AMFNodeElementBase *pParent) :
-			Type(pType), Parent(pParent) {
+			Type(pType), ID(), Parent(pParent), Child() {
 		// empty
 	}
 }; // class IAMFImporter_NodeElement

+/// \struct CAMFImporter_NodeElement_Constellation
 /// A collection of objects or constellations with specific relative locations.
 struct AMFConstellation : public AMFNodeElementBase {
 	/// Constructor.
@ -114,6 +119,7 @@ struct AMFConstellation : public AMFNodeElementBase {

 }; // struct CAMFImporter_NodeElement_Constellation

+/// \struct CAMFImporter_NodeElement_Instance
 /// Part of constellation.
 struct AMFInstance : public AMFNodeElementBase {

@ -132,6 +138,7 @@ struct AMFInstance : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Instance, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Metadata
 /// Structure that define metadata node.
 struct AMFMetadata : public AMFNodeElementBase {

@ -144,6 +151,7 @@ struct AMFMetadata : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Metadata, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Root
 /// Structure that define root node.
 struct AMFRoot : public AMFNodeElementBase {

@ -156,6 +164,7 @@ struct AMFRoot : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Root, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Color
 /// Structure that define object node.
 struct AMFColor : public AMFNodeElementBase {
 	bool Composed; ///< Type of color stored: if true then look for formula in \ref Color_Composed[4], else - in \ref Color.
@ -166,11 +175,12 @@ struct AMFColor : public AMFNodeElementBase {
 	/// @brief  Constructor.
 	/// @param [in] pParent - pointer to parent node.
 	AMFColor(AMFNodeElementBase *pParent) :
-			AMFNodeElementBase(ENET_Color, pParent), Composed(false), Color() {
+			AMFNodeElementBase(ENET_Color, pParent), Composed(false), Color(), Profile() {
 		// empty
 	}
 };

+/// \struct CAMFImporter_NodeElement_Material
 /// Structure that define material node.
 struct AMFMaterial : public AMFNodeElementBase {

@ -180,6 +190,7 @@ struct AMFMaterial : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Material, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Object
 /// Structure that define object node.
 struct AMFObject : public AMFNodeElementBase {

@ -198,6 +209,7 @@ struct AMFMesh : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Mesh, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Vertex
 /// Structure that define vertex node.
 struct AMFVertex : public AMFNodeElementBase {
 	/// Constructor.
@ -206,6 +218,7 @@ struct AMFVertex : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Vertex, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Edge
 /// Structure that define edge node.
 struct AMFEdge : public AMFNodeElementBase {
 	/// Constructor.
@ -214,6 +227,7 @@ struct AMFEdge : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Edge, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Vertices
 /// Structure that define vertices node.
 struct AMFVertices : public AMFNodeElementBase {
 	/// Constructor.
@ -222,6 +236,7 @@ struct AMFVertices : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Vertices, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Volume
 /// Structure that define volume node.
 struct AMFVolume : public AMFNodeElementBase {
 	std::string MaterialID; ///< Which material to use.
@ -233,6 +248,7 @@ struct AMFVolume : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Volume, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_Coordinates
 /// Structure that define coordinates node.
 struct AMFCoordinates : public AMFNodeElementBase {
 	aiVector3D Coordinate; ///< Coordinate.
@ -243,6 +259,7 @@ struct AMFCoordinates : public AMFNodeElementBase {
 			AMFNodeElementBase(ENET_Coordinates, pParent) {}
 };

+/// \struct CAMFImporter_NodeElement_TexMap
 /// Structure that define texture coordinates node.
 struct AMFTexMap : public AMFNodeElementBase {
 	aiVector3D TextureCoordinate[3]; ///< Texture coordinates.
@ -254,11 +271,12 @@ struct AMFTexMap : public AMFNodeElementBase {
 	/// Constructor.
 	/// \param [in] pParent - pointer to parent node.
 	AMFTexMap(AMFNodeElementBase *pParent) :
-			AMFNodeElementBase(ENET_TexMap, pParent), TextureCoordinate{} {
+			AMFNodeElementBase(ENET_TexMap, pParent), TextureCoordinate{}, TextureID_R(), TextureID_G(), TextureID_B(), TextureID_A() {
 		// empty
 	}
 };

+/// \struct CAMFImporter_NodeElement_Triangle
 /// Structure that define triangle node.
 struct AMFTriangle : public AMFNodeElementBase {
 	size_t V[3]; ///< Triangle vertices.
--- a/code/AssetLib/AMF/AMFImporter_Postprocess.cpp
+++ b/code/AssetLib/AMF/AMFImporter_Postprocess.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -224,8 +224,7 @@ size_t AMFImporter::PostprocessHelper_GetTextureID_Or_Create(const std::string &
    }

    // Create format hint.
-    constexpr char templateColor[] = "rgba0000";
-    memcpy(converted_texture.FormatHint, templateColor, 8);
+    strcpy(converted_texture.FormatHint, "rgba0000"); // copy initial string.
    if (!r.empty()) converted_texture.FormatHint[4] = '8';
    if (!g.empty()) converted_texture.FormatHint[5] = '8';
    if (!b.empty()) converted_texture.FormatHint[6] = '8';
@ -691,7 +690,7 @@ void AMFImporter::Postprocess_BuildConstellation(AMFConstellation &pConstellatio
        if (ne->Type == AMFNodeElementBase::ENET_Metadata) continue;
        if (ne->Type != AMFNodeElementBase::ENET_Instance) throw DeadlyImportError("Only <instance> nodes can be in <constellation>.");

-        // create alias for convenience
+        // create alias for conveniance
        AMFInstance &als = *((AMFInstance *)ne);
        // find referenced object
        if (!Find_ConvertedNode(als.ObjectID, nodeArray, &found_node)) Throw_ID_NotFound(als.ObjectID);
@ -816,7 +815,6 @@ nl_clean_loop:
            for (; next_it != nodeArray.end(); ++next_it) {
                if ((*next_it)->FindNode((*nl_it)->mName) != nullptr) {
                    // if current top node(nl_it) found in another top node then erase it from node_list and restart search loop.
-                    // FIXME: this leaks memory on test models test8.amf and test9.amf
                    nodeArray.erase(nl_it);

                    goto nl_clean_loop;
@ -868,7 +866,7 @@ nl_clean_loop:
            pScene->mTextures[idx]->mHeight = static_cast<unsigned int>(tex_convd.Height);
            pScene->mTextures[idx]->pcData = (aiTexel *)tex_convd.Data;
            // texture format description.
-            strncpy(pScene->mTextures[idx]->achFormatHint, tex_convd.FormatHint, HINTMAXTEXTURELEN);
+            strcpy(pScene->mTextures[idx]->achFormatHint, tex_convd.FormatHint);
            idx++;
        } // for(const SPP_Texture& tex_convd: mTexture_Converted)

--- a/code/AssetLib/ASE/ASELoader.cpp
+++ b/code/AssetLib/ASE/ASELoader.cpp
@ -3,7 +3,9 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+
+

 All rights reserved.

@ -44,6 +46,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 #ifndef ASSIMP_BUILD_NO_ASE_IMPORTER
+
 #ifndef ASSIMP_BUILD_NO_3DS_IMPORTER

 // internal headers
@ -63,10 +66,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // utilities
 #include <assimp/fast_atof.h>

-namespace Assimp {
+using namespace Assimp;
 using namespace Assimp::ASE;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "ASE Importer",
    "",
    "",
@ -86,11 +89,27 @@ ASEImporter::ASEImporter() :
    // empty
 }

+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+ASEImporter::~ASEImporter() {
+    // empty
+}
+
 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool ASEImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
-    static const char *tokens[] = { "*3dsmax_asciiexport" };
-    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+bool ASEImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool cs) const {
+    // check file extension
+    const std::string extension = GetExtension(pFile);
+
+    if (extension == "ase" || extension == "ask") {
+        return true;
+    }
+
+    if ((!extension.length() || cs) && pIOHandler) {
+        const char *tokens[] = { "*3dsmax_asciiexport" };
+        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 1);
+    }
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -117,14 +136,14 @@ void ASEImporter::InternReadFile(const std::string &pFile,
    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file
-    if (file == nullptr) {
+    if (file.get() == nullptr) {
        throw DeadlyImportError("Failed to open ASE file ", pFile, ".");
    }

    // Allocate storage and copy the contents of the file to a memory buffer
    std::vector<char> mBuffer2;
    TextFileToBuffer(file.get(), mBuffer2);
-    const size_t fileSize = mBuffer2.size();
+
    this->mBuffer = &mBuffer2[0];
    this->pcScene = pScene;

@ -146,7 +165,7 @@ void ASEImporter::InternReadFile(const std::string &pFile,
    };

    // Construct an ASE parser and parse the file
-    ASE::Parser parser(mBuffer, fileSize, defaultFormat);
+    ASE::Parser parser(mBuffer, defaultFormat);
    mParser = &parser;
    mParser->Parse();

@ -258,7 +277,7 @@ void ASEImporter::GenerateDefaultMaterial() {
    }
    if (bHas || mParser->m_vMaterials.empty()) {
        // add a simple material without submaterials to the parser's list
-        mParser->m_vMaterials.emplace_back(AI_DEFAULT_MATERIAL_NAME);
+        mParser->m_vMaterials.push_back(ASE::Material(AI_DEFAULT_MATERIAL_NAME));
        ASE::Material &mat = mParser->m_vMaterials.back();

        mat.mDiffuse = aiColor3D(0.6f, 0.6f, 0.6f);
@ -321,6 +340,21 @@ void ASEImporter::BuildAnimations(const std::vector<BaseNode *> &nodes) {
                aiNodeAnim *nd = pcAnim->mChannels[iNum++] = new aiNodeAnim();
                nd->mNodeName.Set(me->mName + ".Target");

+                // If there is no input position channel we will need
+                // to supply the default position from the node's
+                // local transformation matrix.
+                /*TargetAnimationHelper helper;
+                if (me->mAnim.akeyPositions.empty())
+                {
+                    aiMatrix4x4& mat = (*i)->mTransform;
+                    helper.SetFixedMainAnimationChannel(aiVector3D(
+                        mat.a4, mat.b4, mat.c4));
+                }
+                else helper.SetMainAnimationChannel (&me->mAnim.akeyPositions);
+                helper.SetTargetAnimationChannel (&me->mTargetAnim.akeyPositions);
+
+                helper.Process(&me->mTargetAnim.akeyPositions);*/
+
                // Allocate the key array and fill it
                nd->mNumPositionKeys = (unsigned int)me->mTargetAnim.akeyPositions.size();
                nd->mPositionKeys = new aiVectorKey[nd->mNumPositionKeys];
@ -446,9 +480,10 @@ void ASEImporter::BuildLights() {
 }

 // ------------------------------------------------------------------------------------------------
-void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes, aiNode *pcParent, const std::string &name) {
+void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes,
+        aiNode *pcParent, const char *szName) {
    aiMatrix4x4 m;
-    AddNodes(nodes, pcParent, name, m);
+    AddNodes(nodes, pcParent, szName, m);
 }

 // ------------------------------------------------------------------------------------------------
@ -505,9 +540,10 @@ void ASEImporter::AddMeshes(const ASE::BaseNode *snode, aiNode *node) {

 // ------------------------------------------------------------------------------------------------
 // Add child nodes to a given parent node
-void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes, aiNode *pcParent, const std::string &name,
+void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes,
+        aiNode *pcParent, const char *szName,
        const aiMatrix4x4 &mat) {
-    const size_t len = name.size();
+    const size_t len = szName ? ::strlen(szName) : 0;
    ai_assert(4 <= AI_MAX_NUMBER_OF_COLOR_SETS);

    // Receives child nodes for the pcParent node
@ -517,18 +553,16 @@ void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes, aiNode *pcParen
    // which has *us* as parent.
    for (std::vector<BaseNode *>::const_iterator it = nodes.begin(), end = nodes.end(); it != end; ++it) {
        const BaseNode *snode = *it;
-        if (!name.empty()) {
-            if (len != snode->mParent.length() || name != snode->mParent.c_str()) {
+        if (szName) {
+            if (len != snode->mParent.length() || ::strcmp(szName, snode->mParent.c_str()))
                continue;
-            }
-        } else if (snode->mParent.length()) {
+        } else if (snode->mParent.length())
            continue;
-        }

        (*it)->mProcessed = true;

        // Allocate a new node and add it to the output data structure
-        apcNodes.push_back(new aiNode);
+        apcNodes.push_back(new aiNode());
        aiNode *node = apcNodes.back();

        node->mName.Set((snode->mName.length() ? snode->mName.c_str() : "Unnamed_Node"));
@ -541,7 +575,7 @@ void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes, aiNode *pcParen

        // Add sub nodes - prevent stack overflow due to recursive parenting
        if (node->mName != node->mParent->mName && node->mName != node->mParent->mParent->mName) {
-            AddNodes(nodes, node, node->mName.C_Str(), snode->mTransform);
+            AddNodes(nodes, node, node->mName.data, snode->mTransform);
        }

        // Further processing depends on the type of the node
@ -619,8 +653,7 @@ void ASEImporter::BuildNodes(std::vector<BaseNode *> &nodes) {
    }

    // add all nodes
-    static const std::string none = "";
-    AddNodes(nodes, ch, none);
+    AddNodes(nodes, ch, nullptr);

    // now iterate through al nodes and find those that have not yet
    // been added to the nodegraph (= their parent could not be recognized)
@ -650,7 +683,7 @@ void ASEImporter::BuildNodes(std::vector<BaseNode *> &nodes) {
        }
    }

-    // Are there any orphaned nodes?
+    // Are there ane orphaned nodes?
    if (!aiList.empty()) {
        std::vector<aiNode *> apcNodes;
        apcNodes.reserve(aiList.size() + pcScene->mRootNode->mNumChildren);
@ -849,7 +882,6 @@ void ASEImporter::ConvertMaterial(ASE::Material &mat) {
        unsigned int iWire = 1;
        mat.pcInstance->AddProperty<int>((int *)&iWire, 1, AI_MATKEY_ENABLE_WIREFRAME);
    }
-    // fallthrough
    case D3DS::Discreet3DS::Gouraud:
        eShading = aiShadingMode_Gouraud;
        break;
@ -905,7 +937,7 @@ void ASEImporter::ConvertMeshes(ASE::Mesh &mesh, std::vector<aiMesh *> &avOutMes
        ASSIMP_LOG_WARN("Material index is out of range");
    }

-    // If the material the mesh is assigned to consists of submeshes, split it
+    // If the material the mesh is assigned to is consisting of submeshes, split it
    if (!mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials.empty()) {
        std::vector<ASE::Material> vSubMaterials = mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials;

@ -984,8 +1016,8 @@ void ASEImporter::ConvertMeshes(ASE::Mesh &mesh, std::vector<aiMesh *> &avOutMes
                                            blubb != mesh.mBoneVertices[iIndex2].mBoneWeights.end(); ++blubb) {

                                        // NOTE: illegal cases have already been filtered out
-                                        avOutputBones[(*blubb).first].emplace_back(
-                                                iBase, (*blubb).second);
+                                        avOutputBones[(*blubb).first].push_back(std::pair<unsigned int, float>(
+                                                iBase, (*blubb).second));
                                    }
                                }
                            }
@ -1263,8 +1295,6 @@ bool ASEImporter::GenerateNormals(ASE::Mesh &mesh) {
    return false;
 }

-}
-
 #endif // ASSIMP_BUILD_NO_3DS_IMPORTER

 #endif // !! ASSIMP_BUILD_NO_BASE_IMPORTER
--- a/code/AssetLib/ASE/ASELoader.h
+++ b/code/AssetLib/ASE/ASELoader.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -62,37 +62,42 @@ namespace Assimp {
 class ASEImporter : public BaseImporter {
 public:
    ASEImporter();
-    ~ASEImporter() override = default;
+    ~ASEImporter();

    // -------------------------------------------------------------------
    /** Returns whether the class can handle the format of the given file.
     * See BaseImporter::CanRead() for details.
     */
    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
-        bool checkSig) const override;
+        bool checkSig) const;

 protected:
+
    // -------------------------------------------------------------------
    /** Return importer meta information.
     * See #BaseImporter::GetInfo for the details
     */
-    const aiImporterDesc* GetInfo () const override;
+    const aiImporterDesc* GetInfo () const;
+

    // -------------------------------------------------------------------
    /** Imports the given file into the given scene structure.
    * See BaseImporter::InternReadFile() for details
    */
    void InternReadFile( const std::string& pFile, aiScene* pScene,
-        IOSystem* pIOHandler) override;
+        IOSystem* pIOHandler);
+

    // -------------------------------------------------------------------
    /** Called prior to ReadFile().
    * The function is a request to the importer to update its configuration
    * basing on the Importer's configuration property list.
    */
-    void SetupProperties(const Importer* pImp) override;
+    void SetupProperties(const Importer* pImp);
+

 private:
+
    // -------------------------------------------------------------------
    /** Generate normal vectors basing on smoothing groups
     * (in some cases the normal are already contained in the file)
@ -101,6 +106,7 @@ private:
     */
    bool GenerateNormals(ASE::Mesh& mesh);

+
    // -------------------------------------------------------------------
    /** Create valid vertex/normal/UV/color/face lists.
     *  All elements are unique, faces have only one set of indices
@ -109,43 +115,51 @@ private:
     */
    void BuildUniqueRepresentation(ASE::Mesh& mesh);

+
    /** Create one-material-per-mesh meshes ;-)
     * \param mesh Mesh to work with
     *  \param Receives the list of all created meshes
     */
    void ConvertMeshes(ASE::Mesh& mesh, std::vector<aiMesh*>& avOut);

+
    // -------------------------------------------------------------------
    /** Convert a material to a aiMaterial object
     * \param mat Input material
     */
    void ConvertMaterial(ASE::Material& mat);

+
    // -------------------------------------------------------------------
    /** Setup the final material indices for each mesh
     */
    void BuildMaterialIndices();

+
    // -------------------------------------------------------------------
    /** Build the node graph
     */
    void BuildNodes(std::vector<ASE::BaseNode*>& nodes);

+
    // -------------------------------------------------------------------
    /** Build output cameras
     */
    void BuildCameras();

+
    // -------------------------------------------------------------------
    /** Build output lights
     */
    void BuildLights();

+
    // -------------------------------------------------------------------
    /** Build output animations
     */
    void BuildAnimations(const std::vector<ASE::BaseNode*>& nodes);

+
    // -------------------------------------------------------------------
    /** Add sub nodes to a node
     *  \param pcParent parent node to be filled
@ -153,13 +167,13 @@ private:
     *  \param matrix Current transform
     */
    void AddNodes(const std::vector<ASE::BaseNode*>& nodes,
-        aiNode* pcParent, const std::string &name);
+        aiNode* pcParent,const char* szName);

    void AddNodes(const std::vector<ASE::BaseNode*>& nodes,
-        aiNode* pcParent, const std::string &name,
+        aiNode* pcParent,const char* szName,
        const aiMatrix4x4& matrix);

-    void AddMeshes(const ASE::BaseNode* snode, aiNode* node);
+    void AddMeshes(const ASE::BaseNode* snode,aiNode* node);

    // -------------------------------------------------------------------
    /** Generate a default material and add it to the parser's list
@ -169,6 +183,7 @@ private:
    void GenerateDefaultMaterial();

 protected:
+
    /** Parser instance */
    ASE::Parser* mParser;

@ -188,4 +203,5 @@ protected:

 } // end of namespace Assimp

+
 #endif // AI_3DSIMPORTER_H_INC
--- a/code/AssetLib/ASE/ASEParser.cpp
+++ b/code/AssetLib/ASE/ASEParser.cpp
--- a/code/AssetLib/ASE/ASEParser.h
+++ b/code/AssetLib/ASE/ASEParser.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -94,8 +95,8 @@ struct Material : public D3DS::Material {
    Material(Material &&other) AI_NO_EXCEPT
            : D3DS::Material(std::move(other)),
              avSubMaterials(std::move(other.avSubMaterials)),
-              pcInstance(other.pcInstance),
-              bNeed(other.bNeed) {
+              pcInstance(std::move(other.pcInstance)),
+              bNeed(std::move(other.bNeed)) {
        other.pcInstance = nullptr;
    }

@ -107,15 +108,15 @@ struct Material : public D3DS::Material {
        //D3DS::Material::operator=(std::move(other));

        avSubMaterials = std::move(other.avSubMaterials);
-        pcInstance = other.pcInstance;
-        bNeed = other.bNeed;
+        pcInstance = std::move(other.pcInstance);
+        bNeed = std::move(other.bNeed);

        other.pcInstance = nullptr;

        return *this;
    }

-    ~Material() = default;
+    ~Material() {}

    //! Contains all sub materials of this material
    std::vector<Material> avSubMaterials;
@ -384,18 +385,20 @@ struct Dummy : public BaseNode {
 /** \brief Class to parse ASE files
 */
 class Parser {
-public:
-    /// @brief No default constructor.
-    Parser() = delete;
+private:
+    Parser() AI_NO_EXCEPT {
+        // empty
+    }

+public:
    // -------------------------------------------------------------------
    //! Construct a parser from a given input file which is
    //! guaranteed to be terminated with zero.
-    //! @param file              The name of the input file.
+    //! @param szFile Input file
    //! @param fileFormatDefault Assumed file format version. If the
    //!   file format is specified in the file the new value replaces
    //!   the default value.
-    Parser(const char *file, size_t fileLen, unsigned int fileFormatDefault);
+    Parser(const char *szFile, unsigned int fileFormatDefault);

    // -------------------------------------------------------------------
    //! Parses the file into the parsers internal representation
@ -553,15 +556,13 @@ private:
    //! (also works for MESH_TVERT, MESH_CFACE, MESH_VERTCOL  ...)
    //! \param apOut Output buffer (3 floats)
    //! \param rIndexOut Output index
-    void ParseLV4MeshRealTriple(ai_real *apOut, unsigned int &rIndexOut);
-    void ParseLV4MeshFloatTriple(float *apOut, unsigned int &rIndexOut);
+    void ParseLV4MeshFloatTriple(ai_real *apOut, unsigned int &rIndexOut);

    // -------------------------------------------------------------------
    //! Parse a *MESH_VERT block in a file
    //! (also works for MESH_TVERT, MESH_CFACE, MESH_VERTCOL  ...)
    //! \param apOut Output buffer (3 floats)
-    void ParseLV4MeshRealTriple(ai_real *apOut);
-    void ParseLV4MeshFloatTriple(float *apOut);
+    void ParseLV4MeshFloatTriple(ai_real *apOut);

    // -------------------------------------------------------------------
    //! Parse a *MESH_TFACE block in a file
@ -579,8 +580,7 @@ private:
    // -------------------------------------------------------------------
    //! Parse a single float element
    //! \param fOut Output float
-    void ParseLV4MeshReal(ai_real &fOut);
-    void ParseLV4MeshFloat(float &fOut);
+    void ParseLV4MeshFloat(ai_real &fOut);

    // -------------------------------------------------------------------
    //! Parse a single int element
@ -620,8 +620,8 @@ private:
    bool ParseString(std::string &out, const char *szName);

 public:
-    const char *mFilePtr; ////< Pointer to current data
-    const char *mEnd;     ///< The end pointer of the file data
+    //! Pointer to current data
+    const char *filePtr;

    //! background color to be passed to the viewer
    //! QNAN if none was found
--- a/code/AssetLib/Assbin/AssbinExporter.cpp
+++ b/code/AssetLib/Assbin/AssbinExporter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

--- a/code/AssetLib/Assbin/AssbinExporter.h
+++ b/code/AssetLib/Assbin/AssbinExporter.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -42,19 +43,16 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file AssbinExporter.h
 * ASSBIN Exporter Main Header
 */
-#pragma once
 #ifndef AI_ASSBINEXPORTER_H_INC
 #define AI_ASSBINEXPORTER_H_INC

 #include <assimp/defs.h>

-#ifndef ASSIMP_BUILD_NO_EXPORT
-
 // nothing really needed here - reserved for future use like properties
 namespace Assimp {

 void ASSIMP_API ExportSceneAssbin(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* /*pProperties*/);

 }
-#endif
+
 #endif // AI_ASSBINEXPORTER_H_INC
--- a/code/AssetLib/Assbin/AssbinFileWriter.cpp
+++ b/code/AssetLib/Assbin/AssbinFileWriter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -43,16 +43,22 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 #include "AssbinFileWriter.h"
+
 #include "Common/assbin_chunks.h"
 #include "PostProcessing/ProcessHelper.h"

 #include <assimp/Exceptional.h>
 #include <assimp/version.h>
+#include <assimp/Exporter.hpp>
 #include <assimp/IOStream.hpp>

-#include "zlib.h"
+#ifdef ASSIMP_BUILD_NO_OWN_ZLIB
+#include <zlib.h>
+#else
+#include "../contrib/zlib/zlib.h"
+#endif

-#include <ctime>
+#include <time.h>

 #if _MSC_VER
 #pragma warning(push)
@ -126,7 +132,7 @@ inline size_t Write<double>(IOStream *stream, const double &f) {
 // Serialize a vec3
 template <>
 inline size_t Write<aiVector3D>(IOStream *stream, const aiVector3D &v) {
-    size_t t = Write<ai_real>(stream, v.x);
+    size_t t = Write<float>(stream, v.x);
    t += Write<float>(stream, v.y);
    t += Write<float>(stream, v.z);

@ -137,7 +143,7 @@ inline size_t Write<aiVector3D>(IOStream *stream, const aiVector3D &v) {
 // Serialize a color value
 template <>
 inline size_t Write<aiColor3D>(IOStream *stream, const aiColor3D &v) {
-    size_t t = Write<ai_real>(stream, v.r);
+    size_t t = Write<float>(stream, v.r);
    t += Write<float>(stream, v.g);
    t += Write<float>(stream, v.b);

@ -148,7 +154,7 @@ inline size_t Write<aiColor3D>(IOStream *stream, const aiColor3D &v) {
 // Serialize a color value
 template <>
 inline size_t Write<aiColor4D>(IOStream *stream, const aiColor4D &v) {
-    size_t t = Write<ai_real>(stream, v.r);
+    size_t t = Write<float>(stream, v.r);
    t += Write<float>(stream, v.g);
    t += Write<float>(stream, v.b);
    t += Write<float>(stream, v.a);
@ -160,13 +166,13 @@ inline size_t Write<aiColor4D>(IOStream *stream, const aiColor4D &v) {
 // Serialize a quaternion
 template <>
 inline size_t Write<aiQuaternion>(IOStream *stream, const aiQuaternion &v) {
-    size_t t = Write<ai_real>(stream, v.w);
+    size_t t = Write<float>(stream, v.w);
    t += Write<float>(stream, v.x);
    t += Write<float>(stream, v.y);
    t += Write<float>(stream, v.z);
    ai_assert(t == 16);

-    return t;
+    return 16;
 }

 // -----------------------------------------------------------------------------------
@ -178,19 +184,17 @@ inline size_t Write<aiVertexWeight>(IOStream *stream, const aiVertexWeight &v) {
    return t + Write<float>(stream, v.mWeight);
 }

-constexpr size_t MatrixSize = 64;
-
 // -----------------------------------------------------------------------------------
 // Serialize a mat4x4
 template <>
 inline size_t Write<aiMatrix4x4>(IOStream *stream, const aiMatrix4x4 &m) {
    for (unsigned int i = 0; i < 4; ++i) {
        for (unsigned int i2 = 0; i2 < 4; ++i2) {
-            Write<ai_real>(stream, m[i][i2]);
+            Write<float>(stream, m[i][i2]);
        }
    }

-    return MatrixSize;
+    return 64;
 }

 // -----------------------------------------------------------------------------------
@ -273,7 +277,7 @@ public:
        // empty
    }

-    ~AssbinChunkWriter() override {
+    virtual ~AssbinChunkWriter() {
        if (container) {
            container->Write(&magic, sizeof(uint32_t), 1);
            container->Write(&cursor, sizeof(uint32_t), 1);
@ -284,27 +288,26 @@ public:

    void *GetBufferPointer() { return buffer; }

-    size_t Read(void * /*pvBuffer*/, size_t /*pSize*/, size_t /*pCount*/) override {
+    // -------------------------------------------------------------------
+    virtual size_t Read(void * /*pvBuffer*/, size_t /*pSize*/, size_t /*pCount*/) {
        return 0;
    }
-
-    aiReturn Seek(size_t /*pOffset*/, aiOrigin /*pOrigin*/) override {
+    virtual aiReturn Seek(size_t /*pOffset*/, aiOrigin /*pOrigin*/) {
        return aiReturn_FAILURE;
    }
-
-    size_t Tell() const override {
+    virtual size_t Tell() const {
        return cursor;
    }
-
-    void Flush() override {
+    virtual void Flush() {
        // not implemented
    }

-    size_t FileSize() const override {
+    virtual size_t FileSize() const {
        return cursor;
    }

-    size_t Write(const void *pvBuffer, size_t pSize, size_t pCount) override {
+    // -------------------------------------------------------------------
+    virtual size_t Write(const void *pvBuffer, size_t pSize, size_t pCount) {
        pSize *= pCount;
        if (cursor + pSize > cur_size) {
            Grow(cursor + pSize);
@ -638,10 +641,6 @@ protected:
        Write<aiString>(&chunk, l->mName);
        Write<unsigned int>(&chunk, l->mType);

-        Write<aiVector3D>(&chunk, l->mPosition);
-        Write<aiVector3D>(&chunk, l->mDirection);
-        Write<aiVector3D>(&chunk, l->mUp);
-
        if (l->mType != aiLightSource_DIRECTIONAL) {
            Write<float>(&chunk, l->mAttenuationConstant);
            Write<float>(&chunk, l->mAttenuationLinear);
--- a/code/AssetLib/Assbin/AssbinFileWriter.h
+++ b/code/AssetLib/Assbin/AssbinFileWriter.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

--- a/code/AssetLib/Assbin/AssbinLoader.cpp
+++ b/code/AssetLib/Assbin/AssbinLoader.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -65,7 +65,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 using namespace Assimp;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "Assimp Binary Importer",
    "Gargaj / Conspiracy",
    "",
@ -406,7 +406,7 @@ void AssbinImporter::ReadBinaryMesh(IOStream *stream, aiMesh *mesh) {
            f.mIndices = new unsigned int[f.mNumIndices];

            for (unsigned int a = 0; a < f.mNumIndices; ++a) {
-                // Check if unsigned  short ( 16 bit  ) are big enough for the indices
+                // Check if unsigned  short ( 16 bit  ) are big enought for the indices
                if (fitsIntoUI16(mesh->mNumVertices)) {
                    f.mIndices[a] = Read<uint16_t>(stream);
                } else {
@ -556,10 +556,6 @@ void AssbinImporter::ReadBinaryLight(IOStream *stream, aiLight *l) {
    l->mName = Read<aiString>(stream);
    l->mType = (aiLightSourceType)Read<unsigned int>(stream);

-    l->mPosition = Read<aiVector3D>(stream);
-    l->mDirection = Read<aiVector3D>(stream);
-    l->mUp = Read<aiVector3D>(stream);
-
    if (l->mType != aiLightSource_DIRECTIONAL) {
        l->mAttenuationConstant = Read<float>(stream);
        l->mAttenuationLinear = Read<float>(stream);
--- a/code/AssetLib/Assbin/AssbinLoader.h
+++ b/code/AssetLib/Assbin/AssbinLoader.h
@ -3,7 +3,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -73,11 +74,17 @@ private:
    bool compressed;

 public:
-    bool CanRead(const std::string& pFile,
-        IOSystem* pIOHandler, bool checkSig) const override;
-    const aiImporterDesc* GetInfo() const override;
-    void InternReadFile(
-    const std::string& pFile,aiScene* pScene,IOSystem* pIOHandler) override;
+    virtual bool CanRead(
+        const std::string& pFile,
+        IOSystem* pIOHandler,
+        bool checkSig
+    ) const;
+    virtual const aiImporterDesc* GetInfo() const;
+    virtual void InternReadFile(
+    const std::string& pFile,
+        aiScene* pScene,
+        IOSystem* pIOHandler
+    );
    void ReadHeader();
    void ReadBinaryScene( IOStream * stream, aiScene* pScene );
    void ReadBinaryNode( IOStream * stream, aiNode** mRootNode, aiNode* parent );
--- a/code/AssetLib/Assjson/cencode.c
+++ b/code/AssetLib/Assjson/cencode.c
@ -7,7 +7,7 @@ For details, see http://sourceforge.net/projects/libb64

 #include "cencode.h" // changed from <B64/cencode.h>

-static const int CHARS_PER_LINE = 72;
+const int CHARS_PER_LINE = 72;

 #ifdef _MSC_VER
 #pragma warning(push)
--- a/code/AssetLib/Assjson/json_exporter.cpp
+++ b/code/AssetLib/Assjson/json_exporter.cpp
@ -10,7 +10,6 @@ Licensed under a 3-clause BSD license. See the LICENSE file for more information
 #ifndef ASSIMP_BUILD_NO_ASSJSON_EXPORTER

 #include <assimp/scene.h>
-#include <assimp/ai_assert.h>
 #include <assimp/Exporter.hpp>
 #include <assimp/IOStream.hpp>
 #include <assimp/IOSystem.hpp>
@ -24,15 +23,16 @@ Licensed under a 3-clause BSD license. See the LICENSE file for more information

 #define CURRENT_FORMAT_VERSION 100

+// grab scoped_ptr from assimp to avoid a dependency on boost.
+//#include <assimp/../../code/BoostWorkaround/boost/scoped_ptr.hpp>
+
 #include "mesh_splitter.h"

 extern "C" {
-#   include "cencode.h"
+#include "cencode.h"
 }
-
 namespace Assimp {

-// Forward declarations
 void ExportAssimp2Json(const char *, Assimp::IOSystem *, const aiScene *, const Assimp::ExportProperties *);

 // small utility class to simplify serializing the aiScene to Json
@ -41,17 +41,12 @@ public:
    enum {
        Flag_DoNotIndent = 0x1,
        Flag_WriteSpecialFloats = 0x2,
-        Flag_SkipWhitespaces = 0x4
    };

    JSONWriter(Assimp::IOStream &out, unsigned int flags = 0u) :
-            out(out), indent (""), newline("\n"), space(" "), buff (), first(false), flags(flags) {
+            out(out), first(), flags(flags) {
        // make sure that all formatting happens using the standard, C locale and not the user's current locale
        buff.imbue(std::locale("C"));
-        if (flags & Flag_SkipWhitespaces) {
-            newline = "";
-            space = "";
-        }
    }

    ~JSONWriter() {
@ -75,7 +70,7 @@ public:
    void Key(const std::string &name) {
        AddIndentation();
        Delimit();
-        buff << '\"' + name + "\":" << space;
+        buff << '\"' + name + "\": ";
    }

    template <typename Literal>
@ -83,12 +78,12 @@ public:
        AddIndentation();
        Delimit();

-        LiteralToString(buff, name) << newline;
+        LiteralToString(buff, name) << '\n';
    }

    template <typename Literal>
    void SimpleValue(const Literal &s) {
-        LiteralToString(buff, s) << newline;
+        LiteralToString(buff, s) << '\n';
    }

    void SimpleValue(const void *buffer, size_t len) {
@ -107,7 +102,7 @@ public:
            }
        }

-        buff << '\"' << cur_out << "\"" << newline;
+        buff << '\"' << cur_out << "\"\n";
        delete[] cur_out;
    }

@ -120,7 +115,7 @@ public:
            }
        }
        first = true;
-        buff << "{" << newline;
+        buff << "{\n";
        PushIndent();
    }

@ -128,7 +123,7 @@ public:
        PopIndent();
        AddIndentation();
        first = false;
-        buff << "}" << newline;
+        buff << "}\n";
    }

    void StartArray(bool is_element = false) {
@ -140,19 +135,19 @@ public:
            }
        }
        first = true;
-        buff << "[" << newline;
+        buff << "[\n";
        PushIndent();
    }

    void EndArray() {
        PopIndent();
        AddIndentation();
-        buff << "]" << newline;
+        buff << "]\n";
        first = false;
    }

    void AddIndentation() {
-        if (!(flags & Flag_DoNotIndent) && !(flags & Flag_SkipWhitespaces)) {
+        if (!(flags & Flag_DoNotIndent)) {
            buff << indent;
        }
    }
@ -161,7 +156,7 @@ public:
        if (!first) {
            buff << ',';
        } else {
-            buff << space;
+            buff << ' ';
            first = false;
        }
    }
@ -179,6 +174,7 @@ private:
        // escape backslashes and single quotes, both would render the JSON invalid if left as is
        t.reserve(s.length);
        for (size_t i = 0; i < s.length; ++i) {
+
            if (s.data[i] == '\\' || s.data[i] == '\'' || s.data[i] == '\"') {
                t.push_back('\\');
            }
@ -231,16 +227,14 @@ private:

 private:
    Assimp::IOStream &out;
-    std::string indent;
-    std::string newline;
-    std::string space;
+    std::string indent, newline;
    std::stringstream buff;
    bool first;

    unsigned int flags;
 };

-static void Write(JSONWriter &out, const aiVector3D &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiVector3D &ai, bool is_elem = true) {
    out.StartArray(is_elem);
    out.Element(ai.x);
    out.Element(ai.y);
@ -248,7 +242,7 @@ static void Write(JSONWriter &out, const aiVector3D &ai, bool is_elem = true) {
    out.EndArray();
 }

-static void Write(JSONWriter &out, const aiQuaternion &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiQuaternion &ai, bool is_elem = true) {
    out.StartArray(is_elem);
    out.Element(ai.w);
    out.Element(ai.x);
@ -257,7 +251,7 @@ static void Write(JSONWriter &out, const aiQuaternion &ai, bool is_elem = true)
    out.EndArray();
 }

-static void Write(JSONWriter &out, const aiColor3D &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiColor3D &ai, bool is_elem = true) {
    out.StartArray(is_elem);
    out.Element(ai.r);
    out.Element(ai.g);
@ -265,7 +259,7 @@ static void Write(JSONWriter &out, const aiColor3D &ai, bool is_elem = true) {
    out.EndArray();
 }

-static void Write(JSONWriter &out, const aiMatrix4x4 &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiMatrix4x4 &ai, bool is_elem = true) {
    out.StartArray(is_elem);
    for (unsigned int x = 0; x < 4; ++x) {
        for (unsigned int y = 0; y < 4; ++y) {
@ -275,7 +269,7 @@ static void Write(JSONWriter &out, const aiMatrix4x4 &ai, bool is_elem = true) {
    out.EndArray();
 }

-static void Write(JSONWriter &out, const aiBone &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiBone &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -296,7 +290,7 @@ static void Write(JSONWriter &out, const aiBone &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiFace &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiFace &ai, bool is_elem = true) {
    out.StartArray(is_elem);
    for (unsigned int i = 0; i < ai.mNumIndices; ++i) {
        out.Element(ai.mIndices[i]);
@ -304,7 +298,7 @@ static void Write(JSONWriter &out, const aiFace &ai, bool is_elem = true) {
    out.EndArray();
 }

-static void Write(JSONWriter &out, const aiMesh &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiMesh &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -415,7 +409,7 @@ static void Write(JSONWriter &out, const aiMesh &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiNode &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiNode &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -445,7 +439,7 @@ static void Write(JSONWriter &out, const aiNode &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiMaterial &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiMaterial &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("properties");
@ -476,17 +470,7 @@ static void Write(JSONWriter &out, const aiMaterial &ai, bool is_elem = true) {
                out.SimpleValue(*reinterpret_cast<float *>(prop->mData));
            }
            break;
-            case aiPTI_Double:
-                if (prop->mDataLength / sizeof(double) > 1) {
-                    out.StartArray();
-                    for (unsigned int ii = 0; ii < prop->mDataLength / sizeof(double); ++ii) {
-                        out.Element(reinterpret_cast<double*>(prop->mData)[ii]);
-                    }
-                    out.EndArray();
-                } else {
-                    out.SimpleValue(*reinterpret_cast<double*>(prop->mData));
-                }
-                break;
+
        case aiPTI_Integer:
            if (prop->mDataLength / sizeof(int) > 1) {
                out.StartArray();
@ -499,21 +483,17 @@ static void Write(JSONWriter &out, const aiMaterial &ai, bool is_elem = true) {
            }
            break;

-            case aiPTI_String:
-                {
+        case aiPTI_String: {
            aiString s;
            aiGetMaterialString(&ai, prop->mKey.data, prop->mSemantic, prop->mIndex, &s);
            out.SimpleValue(s);
-                }
-                break;
-            case aiPTI_Buffer:
-                {
+        } break;
+        case aiPTI_Buffer: {
            // binary data is written as series of hex-encoded octets
            out.SimpleValue(prop->mData, prop->mDataLength);
-                }
-                break;
+        } break;
        default:
-                ai_assert(false);
+            assert(false);
        }

        out.EndObj();
@ -523,7 +503,7 @@ static void Write(JSONWriter &out, const aiMaterial &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiTexture &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiTexture &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("width");
@ -559,7 +539,7 @@ static void Write(JSONWriter &out, const aiTexture &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiLight &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiLight &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -607,7 +587,7 @@ static void Write(JSONWriter &out, const aiLight &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiNodeAnim &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiNodeAnim &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -660,7 +640,7 @@ static void Write(JSONWriter &out, const aiNodeAnim &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiAnimation &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiAnimation &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -681,7 +661,7 @@ static void Write(JSONWriter &out, const aiAnimation &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiCamera &ai, bool is_elem = true) {
+void Write(JSONWriter &out, const aiCamera &ai, bool is_elem = true) {
    out.StartObj(is_elem);

    out.Key("name");
@ -708,7 +688,7 @@ static void Write(JSONWriter &out, const aiCamera &ai, bool is_elem = true) {
    out.EndObj();
 }

-static void WriteFormatInfo(JSONWriter &out) {
+void WriteFormatInfo(JSONWriter &out) {
    out.StartObj();
    out.Key("format");
    out.SimpleValue("\"assimp2json\"");
@ -717,7 +697,7 @@ static void WriteFormatInfo(JSONWriter &out) {
    out.EndObj();
 }

-static void Write(JSONWriter &out, const aiScene &ai) {
+void Write(JSONWriter &out, const aiScene &ai) {
    out.StartObj();

    out.Key("__metadata__");
@ -785,7 +765,7 @@ static void Write(JSONWriter &out, const aiScene &ai) {
    out.EndObj();
 }

-void ExportAssimp2Json(const char *file, Assimp::IOSystem *io, const aiScene *scene, const Assimp::ExportProperties *pProperties) {
+void ExportAssimp2Json(const char *file, Assimp::IOSystem *io, const aiScene *scene, const Assimp::ExportProperties *) {
    std::unique_ptr<Assimp::IOStream> str(io->Open(file, "wt"));
    if (!str) {
        throw DeadlyExportError("could not open output file");
@ -802,12 +782,7 @@ void ExportAssimp2Json(const char *file, Assimp::IOSystem *io, const aiScene *sc
        splitter.Execute(scenecopy_tmp);

        // XXX Flag_WriteSpecialFloats is turned on by default, right now we don't have a configuration interface for exporters
-
-        unsigned int flags = JSONWriter::Flag_WriteSpecialFloats;
-        if (pProperties->GetPropertyBool("JSON_SKIP_WHITESPACES", false)) {
-            flags |= JSONWriter::Flag_SkipWhitespaces;
-        }
-        JSONWriter s(*str, flags);
+        JSONWriter s(*str, JSONWriter::Flag_WriteSpecialFloats);
        Write(s, *scenecopy_tmp);

    } catch (...) {
--- a/code/AssetLib/Assjson/mesh_splitter.cpp
+++ b/code/AssetLib/Assjson/mesh_splitter.cpp
@ -69,12 +69,13 @@ void MeshSplitter::UpdateNode(aiNode* pcNode, const std::vector<std::pair<aiMesh
 	for (unsigned int i = 0, end = pcNode->mNumChildren; i < end;++i)	{
 		UpdateNode ( pcNode->mChildren[i], source_mesh_map );
 	}
+	return;
 }

-static const unsigned int WAS_NOT_COPIED = 0xffffffff;
+#define WAS_NOT_COPIED 0xffffffff

-using PerVertexWeight = std::pair <unsigned int,float>;
-using VertexWeightTable = std::vector	<PerVertexWeight>;
+typedef std::pair <unsigned int,float> PerVertexWeight;
+typedef std::vector	<PerVertexWeight> VertexWeightTable;

 // ------------------------------------------------------------------------------------------------
 VertexWeightTable* ComputeVertexBoneWeightTable(const aiMesh* pMesh) {
@ -88,7 +89,7 @@ VertexWeightTable* ComputeVertexBoneWeightTable(const aiMesh* pMesh) {
 		aiBone* bone = pMesh->mBones[i];
 		for (unsigned int a = 0; a < bone->mNumWeights;++a)	{
 			const aiVertexWeight& weight = bone->mWeights[a];
-			avPerVertexWeights[weight.mVertexId].emplace_back(i,weight.mWeight);
+			avPerVertexWeights[weight.mVertexId].push_back( std::make_pair(i,weight.mWeight) );
 		}
 	}
 	return avPerVertexWeights;
@ -99,7 +100,7 @@ void MeshSplitter :: SplitMesh(unsigned int a, aiMesh* in_mesh, std::vector<std:
 	// TODO: should better use std::(multi)set for source_mesh_map.

 	if (in_mesh->mNumVertices <= LIMIT)	{
-		source_mesh_map.emplace_back(in_mesh,a);
+		source_mesh_map.push_back(std::make_pair(in_mesh,a));
 		return;
 	}

@ -186,7 +187,7 @@ void MeshSplitter :: SplitMesh(unsigned int a, aiMesh* in_mesh, std::vector<std:
 				break;
 			}

-			vFaces.emplace_back();
+			vFaces.push_back(aiFace());
 			aiFace& rFace = vFaces.back();

 			// setup face type and number of indices
@ -304,7 +305,7 @@ void MeshSplitter :: SplitMesh(unsigned int a, aiMesh* in_mesh, std::vector<std:
 		}

 		// add the newly created mesh to the list
-		source_mesh_map.emplace_back(out_mesh,a);
+		source_mesh_map.push_back(std::make_pair(out_mesh,a));

 		if (base == in_mesh->mNumFaces) {
 			break;
--- a/code/AssetLib/Assjson/mesh_splitter.h
+++ b/code/AssetLib/Assjson/mesh_splitter.h
@ -24,9 +24,10 @@ struct aiNode;
 /** Splits meshes of unique vertices into meshes with no more vertices than
 *  a given, configurable threshold value. 
 */
-class MeshSplitter {
+class MeshSplitter 
+{
+
 public:
-    unsigned int LIMIT;
 	
 	void SetLimit(unsigned int l) {
 		LIMIT = l;
@ -36,17 +37,25 @@ public:
 		return LIMIT;
 	}

+public:
+
 	// -------------------------------------------------------------------
 	/** Executes the post processing step on the given imported data.
 	 * At the moment a process is not supposed to fail.
 	 * @param pScene The imported data to work at.
 	 */
-    void Execute(aiScene *pScene);
+	void Execute( aiScene* pScene);
+

 private:
-    void UpdateNode(aiNode *pcNode, const std::vector<std::pair<aiMesh *, unsigned int>> &source_mesh_map);
-    void SplitMesh(unsigned int index, aiMesh *mesh, std::vector<std::pair<aiMesh *, unsigned int>> &source_mesh_map);

+	void UpdateNode(aiNode* pcNode, const std::vector<std::pair<aiMesh*, unsigned int> >& source_mesh_map);
+	void SplitMesh (unsigned int index, aiMesh* mesh, std::vector<std::pair<aiMesh*, unsigned int> >& source_mesh_map);
+
+public:
+
+	unsigned int LIMIT;
 };

 #endif // INCLUDED_MESH_SPLITTER
+
--- a/code/AssetLib/Assxml/AssxmlExporter.cpp
+++ b/code/AssetLib/Assxml/AssxmlExporter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
--- a/code/AssetLib/Assxml/AssxmlExporter.h
+++ b/code/AssetLib/Assxml/AssxmlExporter.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -43,7 +43,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file AssxmlExporter.h
 * ASSXML Exporter Main Header
 */
-#pragma once
 #ifndef AI_ASSXMLEXPORTER_H_INC
 #define AI_ASSXMLEXPORTER_H_INC

--- a/code/AssetLib/Assxml/AssxmlFileWriter.cpp
+++ b/code/AssetLib/Assxml/AssxmlFileWriter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -168,7 +168,7 @@ static void WriteNode(const aiNode *node, IOStream *io, unsigned int depth) {
 }

 // -----------------------------------------------------------------------------------
-// Some chunks of text will need to be encoded for XML
+// Some chuncks of text will need to be encoded for XML
 // http://stackoverflow.com/questions/5665231/most-efficient-way-to-escape-xml-html-in-c-string#5665377
 static std::string encodeXML(const std::string &data) {
    std::string buffer;
@ -365,7 +365,7 @@ static void WriteDump(const char *pFile, const char *cmd, const aiScene *scene,

                ioprintf(io, "\t\t\t<MatProperty key=\"%s\" \n\t\t\ttype=\"%s\" tex_usage=\"%s\" tex_index=\"%u\"",
                        prop->mKey.data, sz,
-                        ::aiTextureTypeToString((aiTextureType)prop->mSemantic), prop->mIndex);
+                        ::TextureTypeToString((aiTextureType)prop->mSemantic), prop->mIndex);

                if (prop->mType == aiPTI_Float) {
                    ioprintf(io, " size=\"%i\">\n\t\t\t\t",
@ -601,7 +601,7 @@ static void WriteDump(const char *pFile, const char *cmd, const aiScene *scene,
                ioprintf(io, "\t\t<TextureCoords num=\"%u\" set=\"%u\" name=\"%s\" num_components=\"%u\"> \n",
                         mesh->mNumVertices,
                         a,
-                         (mesh->HasTextureCoordsName(a) ? mesh->GetTextureCoordsName(a)->C_Str() : ""),
+                         mesh->mTextureCoordsNames[a].C_Str(),
                         mesh->mNumUVComponents[a]);

                if (!shortened) {
@ -652,7 +652,7 @@ void DumpSceneToAssxml(
        const char *pFile, const char *cmd, IOSystem *pIOSystem,
        const aiScene *pScene, bool shortened) {
    std::unique_ptr<IOStream> file(pIOSystem->Open(pFile, "wt"));
-    if (!file) {
+    if (!file.get()) {
        throw std::runtime_error("Unable to open output file " + std::string(pFile) + '\n');
    }

--- a/code/AssetLib/Assxml/AssxmlFileWriter.h
+++ b/code/AssetLib/Assxml/AssxmlFileWriter.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -42,7 +43,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file AssxmlFileWriter.h
 *  @brief Declaration of Assxml file writer.
 */
-#pragma once
+
 #ifndef AI_ASSXMLFILEWRITER_H_INC
 #define AI_ASSXMLFILEWRITER_H_INC

--- a/code/AssetLib/B3D/B3DImporter.cpp
+++ b/code/AssetLib/B3D/B3DImporter.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -59,10 +59,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #include <memory>

-namespace Assimp {
+using namespace Assimp;
 using namespace std;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "BlitzBasic 3D Importer",
    "",
    "",
@ -79,7 +79,7 @@ static constexpr aiImporterDesc desc = {
 #pragma warning(disable : 4018)
 #endif

-// #define DEBUG_B3D
+//#define DEBUG_B3D

 template <typename T>
 void DeleteAllBarePointers(std::vector<T> &x) {
@ -88,10 +88,12 @@ void DeleteAllBarePointers(std::vector<T> &x) {
    }
 }

-B3DImporter::~B3DImporter() = default;
+B3DImporter::~B3DImporter() {
+}

 // ------------------------------------------------------------------------------------------------
 bool B3DImporter::CanRead(const std::string &pFile, IOSystem * /*pIOHandler*/, bool /*checkSig*/) const {
+
    size_t pos = pFile.find_last_of('.');
    if (pos == string::npos) {
        return false;
@ -116,7 +118,7 @@ void B3DImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile));

    // Check whether we can read from the file
-    if (file == nullptr) {
+    if (file.get() == nullptr) {
        throw DeadlyImportError("Failed to open B3D file ", pFile, ".");
    }

@ -141,7 +143,7 @@ AI_WONT_RETURN void B3DImporter::Oops() {
 }

 // ------------------------------------------------------------------------------------------------
-AI_WONT_RETURN void B3DImporter::Fail(const string &str) {
+AI_WONT_RETURN void B3DImporter::Fail(string str) {
 #ifdef DEBUG_B3D
    ASSIMP_LOG_ERROR("Error in B3D file data: ", str);
 #endif
@ -150,7 +152,7 @@ AI_WONT_RETURN void B3DImporter::Fail(const string &str) {

 // ------------------------------------------------------------------------------------------------
 int B3DImporter::ReadByte() {
-    if (_pos >= _buf.size()) {
+    if (_pos > _buf.size()) {
        Fail("EOF");
    }

@ -253,7 +255,7 @@ size_t B3DImporter::ChunkSize() {
 template <class T>
 T *B3DImporter::to_array(const vector<T> &v) {
    if (v.empty()) {
-        return nullptr;
+        return 0;
    }
    T *p = new T[v.size()];
    for (size_t i = 0; i < v.size(); ++i) {
@ -266,7 +268,7 @@ T *B3DImporter::to_array(const vector<T> &v) {
 template <class T>
 T **unique_to_array(vector<std::unique_ptr<T>> &v) {
    if (v.empty()) {
-        return nullptr;
+        return 0;
    }
    T **p = new T *[v.size()];
    for (size_t i = 0; i < v.size(); ++i) {
@ -329,7 +331,7 @@ void B3DImporter::ReadBRUS() {
            mat->AddProperty(&i, 1, AI_MATKEY_TWOSIDED);
        }

-        // Textures
+        //Textures
        for (int i = 0; i < n_texs; ++i) {
            int texid = ReadInt();
            if (texid < -1 || (texid >= 0 && texid >= static_cast<int>(_textures.size()))) {
@ -372,7 +374,7 @@ void B3DImporter::ReadVRTS() {
        }

        if (_vflags & 2) {
-            ReadQuat(); // skip v 4bytes...
+            ReadQuat(); //skip v 4bytes...
        }

        for (int j = 0; j < _tcsets; ++j) {
@ -418,6 +420,7 @@ void B3DImporter::ReadTRIS(int v0) {
            ASSIMP_LOG_ERROR("Bad triangle index: i0=", i0, ", i1=", i1, ", i2=", i2);
 #endif
            Fail("Bad triangle index");
+            continue;
        }
        face->mNumIndices = 3;
        face->mIndices = new unsigned[3];
@ -476,13 +479,13 @@ void B3DImporter::ReadKEYS(aiNodeAnim *nodeAnim) {
    while (ChunkSize()) {
        int frame = ReadInt();
        if (flags & 1) {
-            trans.emplace_back(frame, ReadVec3());
+            trans.push_back(aiVectorKey(frame, ReadVec3()));
        }
        if (flags & 2) {
-            scale.emplace_back(frame, ReadVec3());
+            scale.push_back(aiVectorKey(frame, ReadVec3()));
        }
        if (flags & 4) {
-            rot.emplace_back(frame, ReadQuat());
+            rot.push_back(aiQuatKey(frame, ReadQuat()));
        }
    }

@ -616,7 +619,7 @@ void B3DImporter::ReadBB3D(aiScene *scene) {
            } else if (chunk == "BRUS") {
                ReadBRUS();
            } else if (chunk == "NODE") {
-                ReadNODE(nullptr);
+                ReadNODE(0);
            }
            ExitChunk();
        }
@ -641,7 +644,7 @@ void B3DImporter::ReadBB3D(aiScene *scene) {
            int n_tris = mesh->mNumFaces;
            int n_verts = mesh->mNumVertices = n_tris * 3;

-            aiVector3D *mv = mesh->mVertices = new aiVector3D[n_verts], *mn = nullptr, *mc = nullptr;
+            aiVector3D *mv = mesh->mVertices = new aiVector3D[n_verts], *mn = 0, *mc = 0;
            if (_vflags & 1) {
                mn = mesh->mNormals = new aiVector3D[n_verts];
            }
@ -670,7 +673,7 @@ void B3DImporter::ReadBB3D(aiScene *scene) {
                        int bone = v.bones[k];
                        float weight = v.weights[k];

-                        vweights[bone].emplace_back(vertIdx + faceIndex, weight);
+                        vweights[bone].push_back(aiVertexWeight(vertIdx + faceIndex, weight));
                    }
                }
                ++face;
@ -704,22 +707,22 @@ void B3DImporter::ReadBB3D(aiScene *scene) {
        }
    }

-    // nodes
+    //nodes
    scene->mRootNode = _nodes[0];
    _nodes.clear(); // node ownership now belongs to scene

-    // material
+    //material
    if (!_materials.size()) {
        _materials.emplace_back(std::unique_ptr<aiMaterial>(new aiMaterial));
    }
    scene->mNumMaterials = static_cast<unsigned int>(_materials.size());
    scene->mMaterials = unique_to_array(_materials);

-    // meshes
+    //meshes
    scene->mNumMeshes = static_cast<unsigned int>(_meshes.size());
    scene->mMeshes = unique_to_array(_meshes);

-    // animations
+    //animations
    if (_animations.size() == 1 && _nodeAnims.size()) {

        aiAnimation *anim = _animations.back().get();
@ -738,6 +741,4 @@ void B3DImporter::ReadBB3D(aiScene *scene) {
    flip.Execute(scene);
 }

-} // namespace Assimp
-
 #endif // !! ASSIMP_BUILD_NO_B3D_IMPORTER
--- a/code/AssetLib/B3D/B3DImporter.h
+++ b/code/AssetLib/B3D/B3DImporter.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -39,10 +40,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ----------------------------------------------------------------------
 */

-/**
- *  @file Definition of the .b3d importer class.
- */
-#pragma once
+/** @file Definition of the .b3d importer class. */
+
 #ifndef AI_B3DIMPORTER_H_INC
 #define AI_B3DIMPORTER_H_INC

@ -63,12 +62,14 @@ namespace Assimp{
 class B3DImporter : public BaseImporter{
 public:
    B3DImporter() = default;
-    ~B3DImporter() override;
-    bool CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const override;
+    virtual ~B3DImporter();
+
+    virtual bool CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const;

 protected:
-    const aiImporterDesc* GetInfo () const override;
-    void InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler) override;
+
+    virtual const aiImporterDesc* GetInfo () const;
+    virtual void InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler);

 private:

@ -95,7 +96,7 @@ private:
    };

    AI_WONT_RETURN void Oops() AI_WONT_RETURN_SUFFIX;
-    AI_WONT_RETURN void Fail(const std::string &str) AI_WONT_RETURN_SUFFIX;
+    AI_WONT_RETURN void Fail( std::string str ) AI_WONT_RETURN_SUFFIX;

    void ReadTEXS();
    void ReadBRUS();
@ -112,6 +113,7 @@ private:
    void ReadBB3D( aiScene *scene );

    size_t _pos;
+//  unsigned _size;
    std::vector<unsigned char> _buf;
    std::vector<size_t> _stack;

--- a/code/AssetLib/BVH/BVHLoader.cpp
+++ b/code/AssetLib/BVH/BVHLoader.cpp
@ -4,7 +4,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team



@ -55,11 +55,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <map>
 #include <memory>

-namespace Assimp {
-
+using namespace Assimp;
 using namespace Assimp::Formatter;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "BVH Importer (MoCap)",
    "",
    "",
@ -74,8 +73,8 @@ static constexpr aiImporterDesc desc = {

 // ------------------------------------------------------------------------------------------------
 // Aborts the file reading with an exception
-template <typename... T>
-AI_WONT_RETURN void BVHLoader::ThrowException(T &&...args) {
+template<typename... T>
+AI_WONT_RETURN void BVHLoader::ThrowException(T&&... args) {
    throw DeadlyImportError(mFileName, ":", mLine, " - ", args...);
 }

@ -89,13 +88,22 @@ BVHLoader::BVHLoader() :

 // ------------------------------------------------------------------------------------------------
 // Destructor, private as well
-BVHLoader::~BVHLoader() = default;
+BVHLoader::~BVHLoader() {}

 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool BVHLoader::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
-    static const char *tokens[] = { "HIERARCHY" };
-    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+bool BVHLoader::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool cs) const {
+    // check file extension
+    const std::string extension = GetExtension(pFile);
+
+    if (extension == "bvh")
+        return true;
+
+    if ((!extension.length() || cs) && pIOHandler) {
+        const char *tokens[] = { "HIERARCHY" };
+        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 1);
+    }
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -116,7 +124,7 @@ void BVHLoader::InternReadFile(const std::string &pFile, aiScene *pScene, IOSyst

    // read file into memory
    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile));
-    if (file == nullptr) {
+    if (file.get() == nullptr) {
        throw DeadlyImportError("Failed to open file ", pFile, ".");
    }

@ -170,7 +178,7 @@ void BVHLoader::ReadHierarchy(aiScene *pScene) {
 }

 // ------------------------------------------------------------------------------------------------
-// Reads a node and recursively its children and returns the created node;
+// Reads a node and recursively its childs and returns the created node;
 aiNode *BVHLoader::ReadNode() {
    // first token is name
    std::string nodeName = GetNextToken();
@ -187,12 +195,12 @@ aiNode *BVHLoader::ReadNode() {
    std::vector<aiNode *> childNodes;

    // and create an bone entry for it
-    mNodes.emplace_back(node);
+    mNodes.push_back(Node(node));
    Node &internNode = mNodes.back();

    // now read the node's contents
    std::string siteToken;
-    while (true) {
+    while (1) {
        std::string token = GetNextToken();

        // node offset to parent node
@ -248,7 +256,7 @@ aiNode *BVHLoader::ReadEndSite(const std::string &pParentName) {

    // now read the node's contents. Only possible entry is "OFFSET"
    std::string token;
-    while (true) {
+    while (1) {
        token.clear();
        token = GetNextToken();

@ -427,7 +435,7 @@ void BVHLoader::CreateAnimation(aiScene *pScene) {
        nodeAnim->mNodeName.Set(nodeName);
        std::map<BVHLoader::ChannelType, int> channelMap;

-        // Build map of channels
+        //Build map of channels
        for (unsigned int channel = 0; channel < node.mChannels.size(); ++channel) {
            channelMap[node.mChannels[channel]] = channel;
        }
@ -442,7 +450,7 @@ void BVHLoader::CreateAnimation(aiScene *pScene) {

                // Now compute all translations
                for (BVHLoader::ChannelType channel = Channel_PositionX; channel <= Channel_PositionZ; channel = (BVHLoader::ChannelType)(channel + 1)) {
-                    // Find channel in node
+                    //Find channel in node
                    std::map<BVHLoader::ChannelType, int>::iterator mapIter = channelMap.find(channel);

                    if (mapIter == channelMap.end())
@ -486,23 +494,26 @@ void BVHLoader::CreateAnimation(aiScene *pScene) {
            for (unsigned int fr = 0; fr < mAnimNumFrames; ++fr) {
                aiMatrix4x4 temp;
                aiMatrix3x3 rotMatrix;
-                for (unsigned int channelIdx = 0; channelIdx < node.mChannels.size(); ++channelIdx) {
+				for (unsigned int channelIdx = 0; channelIdx < node.mChannels.size(); ++ channelIdx) {
 					switch (node.mChannels[channelIdx]) {
-                    case Channel_RotationX: {
+                    case Channel_RotationX:
+                        {
                        const float angle = node.mChannelValues[fr * node.mChannels.size() + channelIdx] * float(AI_MATH_PI) / 180.0f;
-                        aiMatrix4x4::RotationX(angle, temp);
-                        rotMatrix *= aiMatrix3x3(temp);
-                    } break;
-                    case Channel_RotationY: {
+                        aiMatrix4x4::RotationX( angle, temp); rotMatrix *= aiMatrix3x3( temp);
+                        }
+                        break;
+                    case Channel_RotationY:
+                        {
                        const float angle = node.mChannelValues[fr * node.mChannels.size() + channelIdx] * float(AI_MATH_PI) / 180.0f;
-                        aiMatrix4x4::RotationY(angle, temp);
-                        rotMatrix *= aiMatrix3x3(temp);
-                    } break;
-                    case Channel_RotationZ: {
+                        aiMatrix4x4::RotationY( angle, temp); rotMatrix *= aiMatrix3x3( temp);
+                        }
+                        break;
+                    case Channel_RotationZ:
+                        {
                        const float angle = node.mChannelValues[fr * node.mChannels.size() + channelIdx] * float(AI_MATH_PI) / 180.0f;
-                        aiMatrix4x4::RotationZ(angle, temp);
-                        rotMatrix *= aiMatrix3x3(temp);
-                    } break;
+                        aiMatrix4x4::RotationZ( angle, temp); rotMatrix *= aiMatrix3x3( temp);
+                        }
+                        break;
                    default:
                        break;
 					}
@ -523,6 +534,4 @@ void BVHLoader::CreateAnimation(aiScene *pScene) {
    }
 }

-} // namespace Assimp
-
 #endif // !! ASSIMP_BUILD_NO_BVH_IMPORTER
--- a/code/AssetLib/BVH/BVHLoader.h
+++ b/code/AssetLib/BVH/BVHLoader.h
@ -4,7 +4,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -112,7 +112,7 @@ protected:
    /** Reads the hierarchy */
    void ReadHierarchy(aiScene *pScene);

-    /** Reads a node and recursively its children and returns the created node. */
+    /** Reads a node and recursively its childs and returns the created node. */
    aiNode *ReadNode();

    /** Reads an end node and returns the created node. */
--- a/code/AssetLib/Blender/BlenderBMesh.cpp
+++ b/code/AssetLib/Blender/BlenderBMesh.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
 All rights reserved.

 Redistribution and use of this software in source and binary forms,
@ -52,7 +52,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 namespace Assimp {
 template <>
 const char *LogFunctions<BlenderBMeshConverter>::Prefix() {
-    return "BLEND_BMESH: ";
+    static auto prefix = "BLEND_BMESH: ";
+    return prefix;
 }
 } // namespace Assimp

@ -139,7 +140,7 @@ void BlenderBMeshConverter::ConvertPolyToFaces(const MPoly &poly) {
                ThrowException("BMesh uv loop array has incorrect size");
            }
            const MLoopUV *loopUV = &BMesh->mloopuv[poly.loopstart];
-            AddTFace(loopUV[0].uv, loopUV[1].uv, loopUV[2].uv, poly.totloop == 4 ? loopUV[3].uv : nullptr);
+            AddTFace(loopUV[0].uv, loopUV[1].uv, loopUV[2].uv, poly.totloop == 4 ? loopUV[3].uv : 0);
        }
    } else if (poly.totloop > 4) {
 #if ASSIMP_BLEND_WITH_GLU_TESSELLATE
--- a/code/AssetLib/Blender/BlenderBMesh.h
+++ b/code/AssetLib/Blender/BlenderBMesh.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
 All rights reserved.

 Redistribution and use of this software in source and binary forms,
@ -80,7 +80,7 @@ namespace Assimp
        void DestroyTriMesh( );
        void ConvertPolyToFaces( const Blender::MPoly& poly );
        void AddFace( int v1, int v2, int v3, int v4 = 0 );
-        void AddTFace(const float *uv1, const float *uv2, const float *uv3, const float *uv4 = nullptr);
+        void AddTFace( const float* uv1, const float* uv2, const float *uv3, const float* uv4 = 0 );

        const Blender::Mesh* BMesh;
        Blender::Mesh* triMesh;
--- a/code/AssetLib/Blender/BlenderCustomData.cpp
+++ b/code/AssetLib/Blender/BlenderCustomData.cpp
@ -96,8 +96,7 @@ struct CustomDataTypeDescription {
        *           other (like CD_ORCO, ...) uses arrays of rawtypes or even arrays of Structures
        *           use a special readfunction for that cases
        */
-static std::array<CustomDataTypeDescription, CD_NUMTYPES> customDataTypeDescriptions = { {
-        DECL_STRUCT_CUSTOMDATATYPEDESCRIPTION(MVert),
+std::array<CustomDataTypeDescription, CD_NUMTYPES> customDataTypeDescriptions = { { DECL_STRUCT_CUSTOMDATATYPEDESCRIPTION(MVert),
        DECL_UNSUPPORTED_CUSTOMDATATYPEDESCRIPTION,
        DECL_UNSUPPORTED_CUSTOMDATATYPEDESCRIPTION,
        DECL_STRUCT_CUSTOMDATATYPEDESCRIPTION(MEdge),
--- a/code/AssetLib/Blender/BlenderDNA.cpp
+++ b/code/AssetLib/Blender/BlenderDNA.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -72,7 +72,7 @@ struct Type {

 // ------------------------------------------------------------------------------------------------
 void DNAParser::Parse() {
-    StreamReaderAny &stream = *db.reader;
+    StreamReaderAny &stream = *db.reader.get();
    DNA &dna = db.dna;

    if (!match4(stream, "SDNA")) {
@ -325,10 +325,10 @@ void SectionParser ::Next() {
    stream.SetCurrentPos(current.start + current.size);

    const char tmp[] = {
-        (char)stream.GetI1(),
-        (char)stream.GetI1(),
-        (char)stream.GetI1(),
-        (char)stream.GetI1()
+        (const char)stream.GetI1(),
+        (const char)stream.GetI1(),
+        (const char)stream.GetI1(),
+        (const char)stream.GetI1()
    };
    current.id = std::string(tmp, tmp[3] ? 4 : tmp[2] ? 3 : tmp[1] ? 2 : 1);

--- a/code/AssetLib/Blender/BlenderDNA.h
+++ b/code/AssetLib/Blender/BlenderDNA.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -106,7 +106,9 @@ struct ElemBase {
        // empty
    }

-    virtual ~ElemBase() = default;
+    virtual ~ElemBase() {
+        // empty
+    }

    /** Type name of the element. The type
     * string points is the `c_str` of the `name` attribute of the
@ -414,10 +416,10 @@ template <>
 struct Structure::_defaultInitializer<ErrorPolicy_Fail> {

    template <typename T>
-    void operator()(T & /*out*/, const char *message = "") {
+    void operator()(T & /*out*/, const char * = "") {
        // obviously, it is crucial that _DefaultInitializer is used
        // only from within a catch clause.
-        throw DeadlyImportError("Constructing BlenderDNA Structure encountered an error: ", message);
+        throw DeadlyImportError("Constructing BlenderDNA Structure encountered an error");
    }
 };

@ -429,17 +431,6 @@ inline bool Structure ::ResolvePointer<std::shared_ptr, ElemBase>(std::shared_pt
        const Field &f,
        bool) const;

-template <> bool Structure :: ResolvePointer<std::shared_ptr,ElemBase>(
-    std::shared_ptr<ElemBase>& out, const Pointer & ptrval,
-    const FileDatabase& db, const Field&, bool) const;
-template <> inline void Structure :: Convert<int>    (int& dest,const FileDatabase& db) const;
-template<> inline void Structure :: Convert<short>  (short& dest,const FileDatabase& db) const;
-template <> inline void Structure :: Convert<char>   (char& dest,const FileDatabase& db) const;
-template <> inline void Structure::Convert<unsigned char>(unsigned char& dest, const FileDatabase& db) const;
-template <> inline void Structure :: Convert<float>  (float& dest,const FileDatabase& db) const;
-template <> inline void Structure :: Convert<double> (double& dest,const FileDatabase& db) const;
-template <> inline void Structure :: Convert<Pointer> (Pointer& dest,const FileDatabase& db) const;
-
 // -------------------------------------------------------------------------------
 /** Represents the full data structure information for a single BLEND file.
 *  This data is extracted from the DNA1 chunk in the file.
@ -485,7 +476,7 @@ public:
     *  in BlenderScene.cpp and is machine-generated.
     *  Converters are used to quickly handle objects whose
     *  exact data type is a runtime-property and not yet
-     *  known at compile time (consider Object::data).*/
+     *  known at compile time (consier Object::data).*/
    void RegisterConverters();

    // --------------------------------------------------------
--- a/code/AssetLib/Blender/BlenderDNA.inl
+++ b/code/AssetLib/Blender/BlenderDNA.inl
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

--- a/code/AssetLib/Blender/BlenderIntermediate.h
+++ b/code/AssetLib/Blender/BlenderIntermediate.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -65,7 +65,8 @@ namespace Blender {
    struct TempArray    {
        typedef TCLASS< T*,std::allocator<T*> > mywrap;

-        TempArray() = default;
+        TempArray() {
+        }

        ~TempArray () {
            for(T* elem : arr) {
--- a/code/AssetLib/Blender/BlenderLoader.cpp
+++ b/code/AssetLib/Blender/BlenderLoader.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -63,19 +63,22 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/StringComparison.h>

 #include <cctype>
-#include <memory>
-#include <utility>

 // zlib is needed for compressed blend files
 #ifndef ASSIMP_BUILD_NO_COMPRESSED_BLEND
-#include "Common/Compression.h"
+#  ifdef ASSIMP_BUILD_NO_OWN_ZLIB
+#    include <zlib.h>
+#  else
+#    include "../contrib/zlib/zlib.h"
+#  endif
 #endif

 namespace Assimp {

 template <>
 const char *LogFunctions<BlenderImporter>::Prefix() {
-    return "BLEND: ";
+    static auto prefix = "BLEND: ";
+    return prefix;
 }

 } // namespace Assimp
@ -84,7 +87,7 @@ using namespace Assimp;
 using namespace Assimp::Blender;
 using namespace Assimp::Formatter;

-static constexpr aiImporterDesc blenderDesc = {
+static const aiImporterDesc blenderDesc = {
    "Blender 3D Importer (http://www.blender3d.org)",
    "",
    "",
@ -110,12 +113,23 @@ BlenderImporter::~BlenderImporter() {
    delete modifier_cache;
 }

-static const char Token[] = "BLENDER";
+static const char *Tokens[] = { "BLENDER" };
+static const char *TokensForSearch[] = { "blender" };

 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool BlenderImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
-    return ParseMagicToken(pFile, pIOHandler).error.empty();
+bool BlenderImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const {
+    const std::string &extension = GetExtension(pFile);
+    if (extension == "blend") {
+        return true;
+    }
+
+    if ((!extension.length() || checkSig) && pIOHandler) {
+        // note: this won't catch compressed files
+        return SearchFileHeaderForToken(pIOHandler, pFile, TokensForSearch, 1);
+    }
+
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -134,25 +148,98 @@ void BlenderImporter::SetupProperties(const Importer * /*pImp*/) {
 // Imports the given file into the given scene structure.
 void BlenderImporter::InternReadFile(const std::string &pFile,
        aiScene *pScene, IOSystem *pIOHandler) {
+#ifndef ASSIMP_BUILD_NO_COMPRESSED_BLEND
+    std::vector<Bytef> uncompressed;
+#endif
+
    FileDatabase file;
-    StreamOrError streamOrError = ParseMagicToken(pFile, pIOHandler);
-    if (!streamOrError.error.empty()) {
-        ThrowException(streamOrError.error);
+    std::shared_ptr<IOStream> stream(pIOHandler->Open(pFile, "rb"));
+    if (!stream) {
+        ThrowException("Could not open file for reading");
    }
-    std::shared_ptr<IOStream> stream = std::move(streamOrError.stream);

-    char version[4] = { 0 };
-    file.i64bit = (stream->Read(version, 1, 1), version[0] == '-');
-    file.little = (stream->Read(version, 1, 1), version[0] == 'v');
+    char magic[8] = { 0 };
+    stream->Read(magic, 7, 1);
+    if (strcmp(magic, Tokens[0])) {
+        // Check for presence of the gzip header. If yes, assume it is a
+        // compressed blend file and try uncompressing it, else fail. This is to
+        // avoid uncompressing random files which our loader might end up with.
+#ifdef ASSIMP_BUILD_NO_COMPRESSED_BLEND
+        ThrowException("BLENDER magic bytes are missing, is this file compressed (Assimp was built without decompression support)?");
+#else

-    stream->Read(version, 3, 1);
-    version[3] = '\0';
+        if (magic[0] != 0x1f || static_cast<uint8_t>(magic[1]) != 0x8b) {
+            ThrowException("BLENDER magic bytes are missing, couldn't find GZIP header either");
+        }

-    LogInfo("Blender version is ", version[0], ".", version + 1,
+        LogDebug("Found no BLENDER magic word but a GZIP header, might be a compressed file");
+        if (magic[2] != 8) {
+            ThrowException("Unsupported GZIP compression method");
+        }
+
+        // http://www.gzip.org/zlib/rfc-gzip.html#header-trailer
+        stream->Seek(0L, aiOrigin_SET);
+        std::shared_ptr<StreamReaderLE> reader = std::shared_ptr<StreamReaderLE>(new StreamReaderLE(stream));
+
+        // build a zlib stream
+        z_stream zstream;
+        zstream.opaque = Z_NULL;
+        zstream.zalloc = Z_NULL;
+        zstream.zfree = Z_NULL;
+        zstream.data_type = Z_BINARY;
+
+        // http://hewgill.com/journal/entries/349-how-to-decompress-gzip-stream-with-zlib
+        inflateInit2(&zstream, 16 + MAX_WBITS);
+
+        zstream.next_in = reinterpret_cast<Bytef *>(reader->GetPtr());
+        zstream.avail_in = (uInt)reader->GetRemainingSize();
+
+        size_t total = 0l;
+
+        // TODO: be smarter about this, decompress directly into heap buffer
+        // and decompress the data .... do 1k chunks in the hope that we won't kill the stack
+#define MYBLOCK 1024
+        Bytef block[MYBLOCK];
+        int ret;
+        do {
+            zstream.avail_out = MYBLOCK;
+            zstream.next_out = block;
+            ret = inflate(&zstream, Z_NO_FLUSH);
+
+            if (ret != Z_STREAM_END && ret != Z_OK) {
+                ThrowException("Failure decompressing this file using gzip, seemingly it is NOT a compressed .BLEND file");
+            }
+            const size_t have = MYBLOCK - zstream.avail_out;
+            total += have;
+            uncompressed.resize(total);
+            memcpy(uncompressed.data() + total - have, block, have);
+        } while (ret != Z_STREAM_END);
+
+        // terminate zlib
+        inflateEnd(&zstream);
+
+        // replace the input stream with a memory stream
+        stream.reset(new MemoryIOStream(reinterpret_cast<uint8_t *>(uncompressed.data()), total));
+
+        // .. and retry
+        stream->Read(magic, 7, 1);
+        if (strcmp(magic, "BLENDER")) {
+            ThrowException("Found no BLENDER magic word in decompressed GZIP file");
+        }
+#endif
+    }
+
+    file.i64bit = (stream->Read(magic, 1, 1), magic[0] == '-');
+    file.little = (stream->Read(magic, 1, 1), magic[0] == 'v');
+
+    stream->Read(magic, 3, 1);
+    magic[3] = '\0';
+
+    LogInfo("Blender version is ", magic[0], ".", magic + 1,
            " (64bit: ", file.i64bit ? "true" : "false",
            ", little endian: ", file.little ? "true" : "false", ")");

-    ParseBlendFile(file, std::move(stream));
+    ParseBlendFile(file, stream);

    Scene scene;
    ExtractScene(scene, file);
@ -169,7 +256,7 @@ void BlenderImporter::ParseBlendFile(FileDatabase &out, std::shared_ptr<IOStream

    out.entries.reserve(128);
    { // even small BLEND files tend to consist of many file blocks
-        SectionParser parser(*out.reader, out.i64bit);
+        SectionParser parser(*out.reader.get(), out.i64bit);

        // first parse the file in search for the DNA and insert all other sections into the database
        while ((parser.Next(), 1)) {
@ -231,53 +318,13 @@ void BlenderImporter::ExtractScene(Scene &out, const FileDatabase &file) {
 #endif
 }

-// ------------------------------------------------------------------------------------------------
-void BlenderImporter::ParseSubCollection(const Blender::Scene &in, aiNode *root, const std::shared_ptr<Collection>& collection, ConversionData &conv_data) {
-
-    std::deque<Object *> root_objects;
-    // Count number of objects
-    for (std::shared_ptr<CollectionObject> cur = std::static_pointer_cast<CollectionObject>(collection->gobject.first); cur; cur = cur->next) {
-        if (cur->ob) {
-            root_objects.push_back(cur->ob);
-        }
-    }
-    std::deque<Collection *> root_children;
-    // Count number of child nodes
-    for (std::shared_ptr<CollectionChild> cur = std::static_pointer_cast<CollectionChild>(collection->children.first); cur; cur = cur->next) {
-        if (cur->collection) {
-            root_children.push_back(cur->collection.get());
-        }
-    }
-    root->mNumChildren = static_cast<unsigned int>(root_objects.size() + root_children.size());
-    root->mChildren = new aiNode *[root->mNumChildren]();
-
-    for (unsigned int i = 0; i < static_cast<unsigned int>(root_objects.size()); ++i) {
-        root->mChildren[i] = ConvertNode(in, root_objects[i], conv_data, aiMatrix4x4());
-        root->mChildren[i]->mParent = root;
-    }
-
-    // For each subcollection create a new node to represent it
-    unsigned int iterator = static_cast<unsigned int>(root_objects.size());
-    for (std::shared_ptr<CollectionChild> cur = std::static_pointer_cast<CollectionChild>(collection->children.first); cur; cur = cur->next) {
-        if (cur->collection) {
-            root->mChildren[iterator] = new aiNode(cur->collection->id.name + 2); // skip over the name prefix 'OB'
-            root->mChildren[iterator]->mParent = root;
-            ParseSubCollection(in, root->mChildren[iterator], cur->collection, conv_data);
-        }
-        iterator += 1;
-    }
-}
-
 // ------------------------------------------------------------------------------------------------
 void BlenderImporter::ConvertBlendFile(aiScene *out, const Scene &in, const FileDatabase &file) {
    ConversionData conv(file);

-    aiNode *root = out->mRootNode = new aiNode("<BlenderRoot>");
-    // Iterate over all objects directly under master_collection,
-    // If in.master_collection == null, then we're parsing something older.
-    if (in.master_collection) {
-        ParseSubCollection(in, root, in.master_collection, conv);
-    } else {
+    // FIXME it must be possible to take the hierarchy directly from
+    // the file. This is terrible. Here, we're first looking for
+    // all objects which don't have parent objects at all -
    std::deque<const Object *> no_parents;
    for (std::shared_ptr<Base> cur = std::static_pointer_cast<Base>(in.base.first); cur; cur = cur->next) {
        if (cur->object) {
@ -300,13 +347,14 @@ void BlenderImporter::ConvertBlendFile(aiScene *out, const Scene &in, const File
        ThrowException("Expected at least one object with no parent");
    }

+    aiNode *root = out->mRootNode = new aiNode("<BlenderRoot>");
+
    root->mNumChildren = static_cast<unsigned int>(no_parents.size());
    root->mChildren = new aiNode *[root->mNumChildren]();
    for (unsigned int i = 0; i < root->mNumChildren; ++i) {
        root->mChildren[i] = ConvertNode(in, no_parents[i], conv, aiMatrix4x4());
        root->mChildren[i]->mParent = root;
    }
-    }

    BuildMaterials(conv);

@ -359,7 +407,7 @@ void BlenderImporter::ResolveImage(aiMaterial *out, const Material *mat, const M
    // check if the file contents are bundled with the BLEND file
    if (img->packedfile) {
        name.data[0] = '*';
-        name.length = 1 + ASSIMP_itoa10(name.data + 1, static_cast<unsigned int>(AI_MAXLEN - 1), static_cast<int32_t>(conv_data.textures->size()));
+        name.length = 1 + ASSIMP_itoa10(name.data + 1, static_cast<unsigned int>(MAXLEN - 1), static_cast<int32_t>(conv_data.textures->size()));

        conv_data.textures->push_back(new aiTexture());
        aiTexture *curTex = conv_data.textures->back();
@ -433,7 +481,7 @@ void BlenderImporter::AddSentinelTexture(aiMaterial *out, const Material *mat, c
    (void)conv_data;

    aiString name;
-    name.length = ai_snprintf(name.data, AI_MAXLEN, "Procedural,num=%i,type=%s", conv_data.sentinel_cnt++,
+    name.length = ai_snprintf(name.data, MAXLEN, "Procedural,num=%i,type=%s", conv_data.sentinel_cnt++,
            GetTextureTypeDisplayString(tex->tex->type));
    out->AddProperty(&name, AI_MATKEY_TEXTURE_DIFFUSE(
                                    conv_data.next_texture[aiTextureType_DIFFUSE]++));
@ -631,7 +679,7 @@ void BlenderImporter::BuildMaterials(ConversionData &conv_data) {

    BuildDefaultMaterial(conv_data);

-    for (const std::shared_ptr<Material> &mat : conv_data.materials_raw) {
+    for (std::shared_ptr<Material> mat : conv_data.materials_raw) {

        // reset per material global counters
        for (size_t i = 0; i < sizeof(conv_data.next_texture) / sizeof(conv_data.next_texture[0]); ++i) {
@ -937,7 +985,7 @@ void BlenderImporter::ConvertMesh(const Scene & /*in*/, const Object * /*obj*/,
    // key is material number, value is the TextureUVMapping for the material
    typedef std::map<uint32_t, TextureUVMapping> MaterialTextureUVMappings;
    MaterialTextureUVMappings matTexUvMappings;
-    const uint32_t maxMat = static_cast<uint32_t>(mesh->mat.size());
+    const uint32_t maxMat = static_cast<const uint32_t>(mesh->mat.size());
    for (uint32_t m = 0; m < maxMat; ++m) {
        // get material by index
        const std::shared_ptr<Material> pMat = mesh->mat[m];
@ -1288,55 +1336,4 @@ aiNode *BlenderImporter::ConvertNode(const Scene &in, const Object *obj, Convers
    return node.release();
 }

-BlenderImporter::StreamOrError BlenderImporter::ParseMagicToken(const std::string &pFile, IOSystem *pIOHandler) const {
-    std::shared_ptr<IOStream> stream(pIOHandler->Open(pFile, "rb"));
-    if (stream == nullptr) {
-        return {{}, {}, "Could not open file for reading"};
-    }
-
-    char magic[8] = { 0 };
-    stream->Read(magic, 7, 1);
-    if (strcmp(magic, Token) == 0) {
-        return {stream, {}, {}};
-    }
-
-    // Check for presence of the gzip header. If yes, assume it is a
-    // compressed blend file and try uncompressing it, else fail. This is to
-    // avoid uncompressing random files which our loader might end up with.
-#ifdef ASSIMP_BUILD_NO_COMPRESSED_BLEND
-    return {{}, {}, "BLENDER magic bytes are missing, is this file compressed (Assimp was built without decompression support)?"};
-#else
-    if (magic[0] != 0x1f || static_cast<uint8_t>(magic[1]) != 0x8b) {
-        return {{}, {}, "BLENDER magic bytes are missing, couldn't find GZIP header either"};
-    }
-
-    LogDebug("Found no BLENDER magic word but a GZIP header, might be a compressed file");
-    if (magic[2] != 8) {
-        return {{}, {}, "Unsupported GZIP compression method"};
-    }
-
-    // http://www.gzip.org/zlib/rfc-gzip.html#header-trailer
-    stream->Seek(0L, aiOrigin_SET);
-    std::shared_ptr<StreamReaderLE> reader = std::shared_ptr<StreamReaderLE>(new StreamReaderLE(stream));
-
-    size_t total = 0;
-    Compression compression;
-    auto uncompressed = std::make_shared<std::vector<char>>();
-    if (compression.open(Compression::Format::Binary, Compression::FlushMode::NoFlush, 16 + Compression::MaxWBits)) {
-        total = compression.decompress((unsigned char *)reader->GetPtr(), reader->GetRemainingSize(), *uncompressed);
-        compression.close();
-    }
-
-    // replace the input stream with a memory stream
-    stream = std::make_shared<MemoryIOStream>(reinterpret_cast<uint8_t *>(uncompressed->data()), total);
-
-    // .. and retry
-    stream->Read(magic, 7, 1);
-    if (strcmp(magic, Token) == 0) {
-        return {stream, uncompressed, {}};
-    }
-    return {{}, {}, "Found no BLENDER magic word in decompressed GZIP file"};
-#endif
-}
-
 #endif // ASSIMP_BUILD_NO_BLEND_IMPORTER
--- a/code/AssetLib/Blender/BlenderLoader.h
+++ b/code/AssetLib/Blender/BlenderLoader.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -42,7 +43,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file  BlenderLoader.h
 *  @brief Declaration of the Blender 3D (*.blend) importer class.
 */
-#pragma once
 #ifndef INCLUDED_AI_BLEND_LOADER_H
 #define INCLUDED_AI_BLEND_LOADER_H

@ -58,152 +58,147 @@ struct aiMaterial;

 namespace Assimp    {

-// TinyFormatter.h
-namespace Formatter {
+    // TinyFormatter.h
+    namespace Formatter {
+        template <typename T,typename TR, typename A> class basic_formatter;
+        typedef class basic_formatter< char, std::char_traits<char>, std::allocator<char> > format;
+    }

-template <typename T, typename TR, typename A>
-class basic_formatter;
+    // BlenderDNA.h
+    namespace Blender {
+        class  FileDatabase;
+        struct ElemBase;
+    }

-typedef class basic_formatter<char, std::char_traits<char>, std::allocator<char>> format;
+    // BlenderScene.h
+    namespace Blender {
+        struct Scene;
+        struct Object;
+        struct Mesh;
+        struct Camera;
+        struct Lamp;
+        struct MTex;
+        struct Image;
+        struct Material;
+    }

-} // namespace Formatter
+    // BlenderIntermediate.h
+    namespace Blender {
+        struct ConversionData;
+        template <template <typename,typename> class TCLASS, typename T> struct TempArray;
+    }

-// BlenderDNA.h
-namespace Blender {
-class FileDatabase;
-struct ElemBase;
-} // namespace Blender
+    // BlenderModifier.h
+    namespace Blender {
+        class BlenderModifierShowcase;
+        class BlenderModifier;
+    }

-// BlenderScene.h
-namespace Blender {
-struct Scene;
-struct Object;
-struct Collection;
-struct Mesh;
-struct Camera;
-struct Lamp;
-struct MTex;
-struct Image;
-struct Material;
-} // namespace Blender

-// BlenderIntermediate.h
-namespace Blender {
-struct ConversionData;
-template <template <typename, typename> class TCLASS, typename T>
-struct TempArray;
-} // namespace Blender
-
-// BlenderModifier.h
-namespace Blender {
-class BlenderModifierShowcase;
-class BlenderModifier;
-} // namespace Blender

 // -------------------------------------------------------------------------------------------
 /** Load blenders official binary format. The actual file structure (the `DNA` how they
 *  call it is outsourced to BlenderDNA.cpp/BlenderDNA.h. This class only performs the
 *  conversion from intermediate format to aiScene. */
 // -------------------------------------------------------------------------------------------
-class BlenderImporter : public BaseImporter, public LogFunctions<BlenderImporter> {
+class BlenderImporter : public BaseImporter, public LogFunctions<BlenderImporter>
+{
 public:
    BlenderImporter();
-    ~BlenderImporter() override;
-    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const override;
+    ~BlenderImporter();
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const;

 protected:
-    const aiImporterDesc *GetInfo() const override;
-    void SetupProperties(const Importer *pImp) override;
-    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;
-    void ParseBlendFile(Blender::FileDatabase &out, std::shared_ptr<IOStream> stream);
-    void ExtractScene(Blender::Scene &out, const Blender::FileDatabase &file);
-    void ParseSubCollection(const Blender::Scene &in, aiNode *root, const std::shared_ptr<Blender::Collection>& collection, Blender::ConversionData &conv_data);
-    void ConvertBlendFile(aiScene *out, const Blender::Scene &in, const Blender::FileDatabase &file);
+    const aiImporterDesc* GetInfo () const;
+    void SetupProperties(const Importer* pImp);
+    void InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler);
+    void ParseBlendFile(Blender::FileDatabase& out, std::shared_ptr<IOStream> stream);
+    void ExtractScene(Blender::Scene& out, const Blender::FileDatabase& file);
+    void ConvertBlendFile(aiScene* out, const Blender::Scene& in, const Blender::FileDatabase& file);

 private:
-    aiNode *ConvertNode(const Blender::Scene &in,
-            const Blender::Object *obj,
-            Blender::ConversionData &conv_info,
-            const aiMatrix4x4 &parentTransform);
+    aiNode* ConvertNode(const Blender::Scene& in,
+        const Blender::Object* obj,
+        Blender::ConversionData& conv_info,
+        const aiMatrix4x4& parentTransform
+    );

    // --------------------
-    void ConvertMesh(const Blender::Scene &in,
-            const Blender::Object *obj,
-            const Blender::Mesh *mesh,
-            Blender::ConversionData &conv_data,
-            Blender::TempArray<std::vector, aiMesh> &temp);
+    void ConvertMesh(const Blender::Scene& in,
+        const Blender::Object* obj,
+        const Blender::Mesh* mesh,
+        Blender::ConversionData& conv_data,
+        Blender::TempArray<std::vector,aiMesh>& temp
+    );

    // --------------------
-    aiLight *ConvertLight(const Blender::Scene &in,
-            const Blender::Object *obj,
-            const Blender::Lamp *mesh,
-            Blender::ConversionData &conv_data);
+    aiLight* ConvertLight(const Blender::Scene& in,
+        const Blender::Object* obj,
+        const Blender::Lamp* mesh,
+        Blender::ConversionData& conv_data
+    );

    // --------------------
-    aiCamera *ConvertCamera(const Blender::Scene &in,
-            const Blender::Object *obj,
-            const Blender::Camera *mesh,
-            Blender::ConversionData &conv_data);
+    aiCamera* ConvertCamera(const Blender::Scene& in,
+        const Blender::Object* obj,
+        const Blender::Camera* mesh,
+        Blender::ConversionData& conv_data
+    );

    // --------------------
    void BuildDefaultMaterial(
-            Blender::ConversionData &conv_data);
+        Blender::ConversionData& conv_data
+    );

-    // --------------------
    void AddBlendParams(
-            aiMaterial *result,
-            const Blender::Material *source);
+        aiMaterial* result,
+        const Blender::Material* source
+    );

-    // --------------------
    void BuildMaterials(
-            Blender::ConversionData &conv_data);
+        Blender::ConversionData& conv_data
+    );

    // --------------------
    void ResolveTexture(
-            aiMaterial *out,
-            const Blender::Material *mat,
-            const Blender::MTex *tex,
-            Blender::ConversionData &conv_data);
+        aiMaterial* out,
+        const Blender::Material* mat,
+        const Blender::MTex* tex,
+        Blender::ConversionData& conv_data
+    );

    // --------------------
    void ResolveImage(
-            aiMaterial *out,
-            const Blender::Material *mat,
-            const Blender::MTex *tex,
-            const Blender::Image *img,
-            Blender::ConversionData &conv_data);
+        aiMaterial* out,
+        const Blender::Material* mat,
+        const Blender::MTex* tex,
+        const Blender::Image* img,
+        Blender::ConversionData& conv_data
+    );

-    // --------------------
    void AddSentinelTexture(
-            aiMaterial *out,
-            const Blender::Material *mat,
-            const Blender::MTex *tex,
-            Blender::ConversionData &conv_data);
-
-    // TODO: Move to a std::variant, once c++17 is supported.
-    struct StreamOrError {
-        std::shared_ptr<IOStream> stream;
-        std::shared_ptr<std::vector<char>> input;
-        std::string error;
-    };
-
-    // Returns either a stream (and optional input data for the stream) or
-    // an error if it can't parse the magic token.
-    StreamOrError ParseMagicToken(
-            const std::string &pFile,
-            IOSystem *pIOHandler) const;
+        aiMaterial* out,
+        const Blender::Material* mat,
+        const Blender::MTex* tex,
+        Blender::ConversionData& conv_data
+    );

 private: // static stuff, mostly logging and error reporting.
-    // --------------------
-    static void CheckActualType(const Blender::ElemBase *dt,
-            const char *check);

    // --------------------
-    static void NotSupportedObjectType(const Blender::Object *obj,
-            const char *type);
+    static void CheckActualType(const Blender::ElemBase* dt,
+        const char* check
+    );
+
+    // --------------------
+    static void NotSupportedObjectType(const Blender::Object* obj,
+        const char* type
+    );
+

 private:
-    Blender::BlenderModifierShowcase *modifier_cache;
+
+    Blender::BlenderModifierShowcase* modifier_cache;

 }; // !class BlenderImporter

--- a/code/AssetLib/Blender/BlenderModifier.cpp
+++ b/code/AssetLib/Blender/BlenderModifier.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -71,6 +71,10 @@ static const fpCreateModifier creators[] = {
    nullptr // sentinel
 };

+// ------------------------------------------------------------------------------------------------
+struct SharedModifierData : ElemBase {
+    ModifierData modifier;
+};

 // ------------------------------------------------------------------------------------------------
 void BlenderModifierShowcase::ApplyModifiers(aiNode &out, ConversionData &conv_data, const Scene &in, const Object &orig_object) {
@ -153,7 +157,6 @@ void BlenderModifier_Mirror ::DoIt(aiNode &out, ConversionData &conv_data, const
    // hijacking the ABI, see the big note in BlenderModifierShowcase::ApplyModifiers()
    const MirrorModifierData &mir = static_cast<const MirrorModifierData &>(orig_modifier);
    ai_assert(mir.modifier.type == ModifierData::eModifierType_Mirror);
-    std::shared_ptr<Object> mirror_ob = mir.mirror_ob.lock();

    conv_data.meshes->reserve(conv_data.meshes->size() + out.mNumMeshes);

@ -168,8 +171,8 @@ void BlenderModifier_Mirror ::DoIt(aiNode &out, ConversionData &conv_data, const
        const float ys = mir.flag & MirrorModifierData::Flags_AXIS_Y ? -1.f : 1.f;
        const float zs = mir.flag & MirrorModifierData::Flags_AXIS_Z ? -1.f : 1.f;

-        if (mirror_ob) {
-            const aiVector3D center(mirror_ob->obmat[3][0], mirror_ob->obmat[3][1], mirror_ob->obmat[3][2]);
+        if (mir.mirror_ob) {
+            const aiVector3D center(mir.mirror_ob->obmat[3][0], mir.mirror_ob->obmat[3][1], mir.mirror_ob->obmat[3][2]);
            for (unsigned int j = 0; j < mesh->mNumVertices; ++j) {
                aiVector3D &v = mesh->mVertices[j];

@ -283,11 +286,6 @@ void BlenderModifier_Subdivision ::DoIt(aiNode &out, ConversionData &conv_data,
    if (conv_data.meshes->empty()) {
        return;
    }
-    const size_t meshIndex = conv_data.meshes->size() - out.mNumMeshes;
-    if (meshIndex >= conv_data.meshes->size()) {
-        ASSIMP_LOG_ERROR("Invalid index detected.");
-        return;
-    }
    aiMesh **const meshes = &conv_data.meshes[conv_data.meshes->size() - out.mNumMeshes];
    std::unique_ptr<aiMesh *[]> tempmeshes(new aiMesh *[out.mNumMeshes]());

--- a/code/AssetLib/Blender/BlenderModifier.h
+++ b/code/AssetLib/Blender/BlenderModifier.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -62,7 +62,9 @@ public:
    /**
     *  The class destructor, virtual.
     */
-    virtual ~BlenderModifier() = default;
+    virtual ~BlenderModifier() {
+        // empty
+    }

    // --------------------
    /** 
--- a/code/AssetLib/Blender/BlenderScene.cpp
+++ b/code/AssetLib/Blender/BlenderScene.cpp
@ -49,8 +49,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "BlenderDNA.h"
 #include "BlenderSceneGen.h"

-namespace Assimp {
-namespace Blender {
+using namespace Assimp;
+using namespace Assimp::Blender;

 //--------------------------------------------------------------------------------
 template <>
@ -94,48 +94,6 @@ void Structure ::Convert<Group>(
    db.reader->IncPtr(size);
 }

-//--------------------------------------------------------------------------------
-template <>
-void Structure::Convert<CollectionObject>(
-        CollectionObject &dest,
-        const FileDatabase &db) const {
-
-    ReadFieldPtr<ErrorPolicy_Fail>(dest.next, "*next", db);
-    {
-        std::shared_ptr<Object> ob;
-        ReadFieldPtr<ErrorPolicy_Igno>(ob, "*ob", db);
-        dest.ob = ob.get();
-    }
-
-    db.reader->IncPtr(size);
-}
-
-//--------------------------------------------------------------------------------
-template <>
-void Structure::Convert<CollectionChild>(
-        CollectionChild &dest,
-        const FileDatabase &db) const {
-
-    ReadFieldPtr<ErrorPolicy_Fail>(dest.prev, "*prev", db);
-    ReadFieldPtr<ErrorPolicy_Fail>(dest.next, "*next", db);
-    ReadFieldPtr<ErrorPolicy_Igno>(dest.collection, "*collection", db);
-
-    db.reader->IncPtr(size);
-}
-
-//--------------------------------------------------------------------------------
-template <>
-void Structure::Convert<Collection>(
-        Collection &dest,
-        const FileDatabase &db) const {
-
-    ReadField<ErrorPolicy_Fail>(dest.id, "id", db);
-    ReadField<ErrorPolicy_Fail>(dest.gobject, "gobject", db);
-    ReadField<ErrorPolicy_Fail>(dest.children, "children", db);
-
-    db.reader->IncPtr(size);
-}
-
 //--------------------------------------------------------------------------------
 template <>
 void Structure ::Convert<MTex>(
@ -297,7 +255,7 @@ void Structure ::Convert<Base>(
        const FileDatabase &db) const {
    // note: as per https://github.com/assimp/assimp/issues/128,
    // reading the Object linked list recursively is prone to stack overflow.
-    // This structure converter is therefore a hand-written exception that
+    // This structure converter is therefore an hand-written exception that
    // does it iteratively.

    const int initial_pos = db.reader->GetCurrentPos();
@ -565,7 +523,7 @@ void Structure ::Convert<MVert>(
        const FileDatabase &db) const {

    ReadFieldArray<ErrorPolicy_Fail>(dest.co, "co", db);
-    ReadFieldArray<ErrorPolicy_Warn>(dest.no, "no", db);
+    ReadFieldArray<ErrorPolicy_Fail>(dest.no, "no", db);
    ReadField<ErrorPolicy_Igno>(dest.flag, "flag", db);
    //ReadField<ErrorPolicy_Warn>(dest.mat_nr,"mat_nr",db);
    ReadField<ErrorPolicy_Igno>(dest.bweight, "bweight", db);
@ -620,9 +578,7 @@ void Structure ::Convert<ListBase>(
        const FileDatabase &db) const {

    ReadFieldPtr<ErrorPolicy_Igno>(dest.first, "*first", db);
-    std::shared_ptr<ElemBase> last;
-    ReadFieldPtr<ErrorPolicy_Igno>(last, "*last", db);
-    dest.last = last;
+    ReadFieldPtr<ErrorPolicy_Igno>(dest.last, "*last", db);

    db.reader->IncPtr(size);
 }
@ -646,9 +602,7 @@ void Structure ::Convert<ModifierData>(
        const FileDatabase &db) const {

    ReadFieldPtr<ErrorPolicy_Warn>(dest.next, "*next", db);
-    std::shared_ptr<ElemBase> prev;
-    ReadFieldPtr<ErrorPolicy_Warn>(prev, "*prev", db);
-    dest.prev = prev;
+    ReadFieldPtr<ErrorPolicy_Warn>(dest.prev, "*prev", db);
    ReadField<ErrorPolicy_Igno>(dest.type, "type", db);
    ReadField<ErrorPolicy_Igno>(dest.mode, "mode", db);
    ReadFieldArray<ErrorPolicy_Igno>(dest.name, "name", db);
@ -706,7 +660,6 @@ void Structure ::Convert<Scene>(
    ReadFieldPtr<ErrorPolicy_Warn>(dest.camera, "*camera", db);
    ReadFieldPtr<ErrorPolicy_Warn>(dest.world, "*world", db);
    ReadFieldPtr<ErrorPolicy_Warn>(dest.basact, "*basact", db);
-    ReadFieldPtr<ErrorPolicy_Warn>(dest.master_collection, "*master_collection", db);
    ReadField<ErrorPolicy_Igno>(dest.base, "base", db);

    db.reader->IncPtr(size);
@ -772,9 +725,7 @@ void Structure ::Convert<MirrorModifierData>(
    ReadField<ErrorPolicy_Igno>(dest.axis, "axis", db);
    ReadField<ErrorPolicy_Igno>(dest.flag, "flag", db);
    ReadField<ErrorPolicy_Igno>(dest.tolerance, "tolerance", db);
-    std::shared_ptr<Object> mirror_ob;
-    ReadFieldPtr<ErrorPolicy_Igno>(mirror_ob, "*mirror_ob", db);
-    dest.mirror_ob = mirror_ob;
+    ReadFieldPtr<ErrorPolicy_Igno>(dest.mirror_ob, "*mirror_ob", db);

    db.reader->IncPtr(size);
 }
@ -835,9 +786,9 @@ void Structure::Convert<CustomDataLayer>(
    ReadField<ErrorPolicy_Fail>(dest.flag, "flag", db);
    ReadField<ErrorPolicy_Fail>(dest.active, "active", db);
    ReadField<ErrorPolicy_Fail>(dest.active_rnd, "active_rnd", db);
-    ReadField<ErrorPolicy_Warn>(dest.active_clone, "active_clone", db);
-    ReadField<ErrorPolicy_Warn>(dest.active_mask, "active_mask", db);
-    ReadField<ErrorPolicy_Warn>(dest.uid, "uid", db);
+    ReadField<ErrorPolicy_Fail>(dest.active_clone, "active_clone", db);
+    ReadField<ErrorPolicy_Fail>(dest.active_mask, "active_mask", db);
+    ReadField<ErrorPolicy_Fail>(dest.uid, "uid", db);
    ReadFieldArray<ErrorPolicy_Warn>(dest.name, "name", db);
    ReadCustomDataPtr<ErrorPolicy_Fail>(dest.data, dest.type, "*data", db);

@ -882,12 +833,6 @@ void DNA::RegisterConverters() {
    converters["Image"] = DNA::FactoryPair(&Structure::Allocate<Image>, &Structure::Convert<Image>);
    converters["CustomData"] = DNA::FactoryPair(&Structure::Allocate<CustomData>, &Structure::Convert<CustomData>);
    converters["CustomDataLayer"] = DNA::FactoryPair(&Structure::Allocate<CustomDataLayer>, &Structure::Convert<CustomDataLayer>);
-    converters["Collection"] = DNA::FactoryPair(&Structure::Allocate<Collection>, &Structure::Convert<Collection>);
-    converters["CollectionChild"] = DNA::FactoryPair(&Structure::Allocate<CollectionChild>, &Structure::Convert<CollectionChild>);
-    converters["CollectionObject"] = DNA::FactoryPair(&Structure::Allocate<CollectionObject>, &Structure::Convert<CollectionObject>);
 }

-} // namespace Blender
-} //namespace Assimp
-
 #endif // ASSIMP_BUILD_NO_BLEND_IMPORTER
--- a/code/AssetLib/Blender/BlenderScene.h
+++ b/code/AssetLib/Blender/BlenderScene.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -107,7 +107,6 @@ namespace Blender {
 struct Object;
 struct MTex;
 struct Image;
-struct Collection;

 #include <memory>

@ -124,7 +123,7 @@ struct ID : ElemBase {
 // -------------------------------------------------------------------------------
 struct ListBase : ElemBase {
    std::shared_ptr<ElemBase> first;
-    std::weak_ptr<ElemBase> last;
+    std::shared_ptr<ElemBase> last;
 };

 // -------------------------------------------------------------------------------
@ -148,26 +147,6 @@ struct Group : ElemBase {
    std::shared_ptr<GroupObject> gobject;
 };

-// -------------------------------------------------------------------------------
-struct CollectionObject : ElemBase {
-    //CollectionObject* prev;
-    std::shared_ptr<CollectionObject> next;
-    Object *ob;
-};
-
-// -------------------------------------------------------------------------------
-struct CollectionChild : ElemBase {
-    std::shared_ptr<CollectionChild> next, prev;
-    std::shared_ptr<Collection> collection;
-};
-
-// -------------------------------------------------------------------------------
-struct Collection : ElemBase {
-    ID id FAIL;
-    ListBase gobject; // CollectionObject
-    ListBase children; // CollectionChild
-};
-
 // -------------------------------------------------------------------------------
 struct World : ElemBase {
    ID id FAIL;
@ -182,7 +161,7 @@ struct MVert : ElemBase {
    int bweight;

    MVert() :
-            flag(0), mat_nr(0), bweight(0) {}
+            ElemBase(), flag(0), mat_nr(0), bweight(0) {}
 };

 // -------------------------------------------------------------------------------
@ -417,6 +396,7 @@ struct CustomDataLayer : ElemBase {
    std::shared_ptr<ElemBase> data; // must be converted to real type according type member

    CustomDataLayer() :
+            ElemBase(),
            type(0),
            offset(0),
            flag(0),
@ -641,21 +621,14 @@ struct ModifierData : ElemBase {
    };

    std::shared_ptr<ElemBase> next WARN;
-    std::weak_ptr<ElemBase> prev WARN;
+    std::shared_ptr<ElemBase> prev WARN;

    int type, mode;
    char name[32];
 };

-
-// ------------------------------------------------------------------------------------------------
-struct SharedModifierData : ElemBase {
-    ModifierData modifier;
-};
-
-
 // -------------------------------------------------------------------------------
-struct SubsurfModifierData : SharedModifierData {
+struct SubsurfModifierData : ElemBase {

    enum Type {

@ -668,6 +641,7 @@ struct SubsurfModifierData : SharedModifierData {
        FLAGS_SubsurfUV = 1 << 3
    };

+    ModifierData modifier FAIL;
    short subdivType WARN;
    short levels FAIL;
    short renderLevels;
@ -675,7 +649,7 @@ struct SubsurfModifierData : SharedModifierData {
 };

 // -------------------------------------------------------------------------------
-struct MirrorModifierData : SharedModifierData {
+struct MirrorModifierData : ElemBase {

    enum Flags {
        Flags_CLIPPING = 1 << 0,
@ -687,9 +661,11 @@ struct MirrorModifierData : SharedModifierData {
        Flags_VGROUP = 1 << 6
    };

+    ModifierData modifier FAIL;
+
    short axis, flag;
    float tolerance;
-    std::weak_ptr<Object> mirror_ob;
+    std::shared_ptr<Object> mirror_ob;
 };

 // -------------------------------------------------------------------------------
@ -728,7 +704,7 @@ struct Object : ElemBase {
    ListBase modifiers;

    Object() :
-            type(Type_EMPTY), parent(nullptr) {
+            ElemBase(), type(Type_EMPTY), parent(nullptr), track(), proxy(), proxy_from(), data() {
        // empty
    }
 };
@ -740,7 +716,8 @@ struct Base : ElemBase {
    std::shared_ptr<Object> object WARN;

    Base() :
-            prev(nullptr) {
+            ElemBase(), prev(nullptr), next(), object() {
+        // empty
        // empty
    }
 };
@ -752,11 +729,13 @@ struct Scene : ElemBase {
    std::shared_ptr<Object> camera WARN;
    std::shared_ptr<World> world WARN;
    std::shared_ptr<Base> basact WARN;
-    std::shared_ptr<Collection> master_collection WARN;

    ListBase base;

-    Scene() = default;
+    Scene() :
+            ElemBase(), camera(), world(), basact() {
+        // empty
+    }
 };

 // -------------------------------------------------------------------------------
@ -786,7 +765,10 @@ struct Image : ElemBase {

    short gen_x, gen_y, gen_type;

-    Image() = default;
+    Image() :
+            ElemBase() {
+        // empty
+    }
 };

 // -------------------------------------------------------------------------------
@ -876,7 +858,7 @@ struct Tex : ElemBase {
    //char use_nodes;

    Tex() :
-            imaflag(ImageFlags_INTERPOL), type(Type_CLOUDS) {
+            ElemBase(), imaflag(ImageFlags_INTERPOL), type(Type_CLOUDS), ima() {
        // empty
    }
 };
@ -968,7 +950,10 @@ struct MTex : ElemBase {
    //float shadowfac;
    //float zenupfac, zendownfac, blendfac;

-    MTex() = default;
+    MTex() :
+            ElemBase() {
+        // empty
+    }
 };

 } // namespace Blender
--- a/code/AssetLib/Blender/BlenderSceneGen.h
+++ b/code/AssetLib/Blender/BlenderSceneGen.h
@ -62,12 +62,6 @@ template <> void Structure :: Convert<Group> (
    ) const
 ;

-template <> void Structure::Convert<Collection>(
-    Collection& dest,
-    const FileDatabase& db
-    ) const
-;
-
 template <> void Structure :: Convert<MTex> (
    MTex& dest,
    const FileDatabase& db
--- a/code/AssetLib/Blender/BlenderTessellator.cpp
+++ b/code/AssetLib/Blender/BlenderTessellator.cpp
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -39,8 +40,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ----------------------------------------------------------------------
 */

-/// @file  BlenderTessellator.cpp
-/// @brief A simple tessellation wrapper
+/** @file  BlenderTessellator.cpp
+ *  @brief A simple tessellation wrapper
+ */
+

 #ifndef ASSIMP_BUILD_NO_BLEND_IMPORTER

@ -59,7 +62,8 @@ namspace Assimp
 {
    template< > const char* LogFunctions< BlenderTessellatorGL >::Prefix()
    {
-        return "BLEND_TESS_GL: ";
+        static auto prefix = "BLEND_TESS_GL: ";
+        return prefix;
    }
 }

@ -77,7 +81,9 @@ BlenderTessellatorGL::BlenderTessellatorGL( BlenderBMeshConverter& converter ):
 }

 // ------------------------------------------------------------------------------------------------
-BlenderTessellatorGL::~BlenderTessellatorGL() = default;
+BlenderTessellatorGL::~BlenderTessellatorGL( )
+{
+}

 // ------------------------------------------------------------------------------------------------
 void BlenderTessellatorGL::Tessellate( const MLoop* polyLoop, int vertexCount, const std::vector< MVert >& vertices )
@ -253,7 +259,8 @@ namespace Assimp
 {
    template< > const char* LogFunctions< BlenderTessellatorP2T >::Prefix()
    {
-        return "BLEND_TESS_P2T: ";
+        static auto prefix = "BLEND_TESS_P2T: ";
+        return prefix;
    }
 }

@ -267,7 +274,9 @@ BlenderTessellatorP2T::BlenderTessellatorP2T( BlenderBMeshConverter& converter )
 }

 // ------------------------------------------------------------------------------------------------
-
+BlenderTessellatorP2T::~BlenderTessellatorP2T( )
+{
+}

 // ------------------------------------------------------------------------------------------------
 void BlenderTessellatorP2T::Tessellate( const MLoop* polyLoop, int vertexCount, const std::vector< MVert >& vertices )
--- a/code/AssetLib/Blender/BlenderTessellator.h
+++ b/code/AssetLib/Blender/BlenderTessellator.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -143,7 +144,11 @@ namespace Assimp

 #if ASSIMP_BLEND_WITH_POLY_2_TRI

-#include "contrib/poly2tri/poly2tri/poly2tri.h"
+#ifdef ASSIMP_USE_HUNTER
+#  include <poly2tri/poly2tri.h>
+#else
+#  include "../contrib/poly2tri/poly2tri/poly2tri.h"
+#endif

 namespace Assimp
 {
@ -181,7 +186,7 @@ namespace Assimp
    {
    public:
        BlenderTessellatorP2T( BlenderBMeshConverter& converter );
-        ~BlenderTessellatorP2T( ) = default;
+        ~BlenderTessellatorP2T( );

        void Tessellate( const Blender::MLoop* polyLoop, int vertexCount, const std::vector< Blender::MVert >& vertices );

--- a/code/AssetLib/C4D/C4DImporter.cpp
+++ b/code/AssetLib/C4D/C4DImporter.cpp
@ -46,6 +46,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // no #ifdefing here, Cinema4D support is carried out in a branch of assimp
 // where it is turned on in the CMake settings.

+#ifndef _MSC_VER
+#   error C4D support is currently MSVC only
+#endif
+
 #include "C4DImporter.h"
 #include <memory>
 #include <assimp/IOSystem.hpp>
@ -82,7 +86,8 @@ void GetWriterInfo(int &id, String &appname) {

 namespace Assimp {
    template<> const char* LogFunctions<C4DImporter>::Prefix() {
-        return "C4D: ";
+        static auto prefix = "C4D: ";
+        return prefix;
    }
 }

@ -100,12 +105,6 @@ static const aiImporterDesc desc = {
 };


-// ------------------------------------------------------------------------------------------------
-C4DImporter::C4DImporter() = default;
-
-// ------------------------------------------------------------------------------------------------
-C4DImporter::~C4DImporter() = default;
-
 // ------------------------------------------------------------------------------------------------
 bool C4DImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const {
    const std::string& extension = GetExtension(pFile);
@ -147,14 +146,8 @@ void C4DImporter::InternReadFile( const std::string& pFile, aiScene* pScene, IOS
        ThrowException("failed to read document " + pFile);
    }

-    // Generate the root-node
    pScene->mRootNode = new aiNode("<C4DRoot>");

-    // convert left-handed to right-handed
-    pScene->mRootNode->mTransformation.a1 = 0.01f;
-    pScene->mRootNode->mTransformation.b2 = 0.01f;
-    pScene->mRootNode->mTransformation.c3 = -0.01f;
-
    // first convert all materials
    ReadMaterials(doc->GetFirstMaterial());

@ -301,7 +294,7 @@ void C4DImporter::RecurseHierarchy(BaseObject* object, aiNode* parent) {

    // based on Cineware sample code
    while (object) {
-        const Int32 type = object->GetType();
+        const LONG type = object->GetType();
        const Matrix& ml = object->GetMl();

        aiNode* const nd = new aiNode();
@ -364,8 +357,8 @@ aiMesh* C4DImporter::ReadMesh(BaseObject* object) {
    PolygonObject* const polyObject = dynamic_cast<PolygonObject*>(object);
    ai_assert(polyObject != nullptr);

-    const Int32 pointCount = polyObject->GetPointCount();
-    const Int32 polyCount = polyObject->GetPolygonCount();
+    const LONG pointCount = polyObject->GetPointCount();
+    const LONG polyCount = polyObject->GetPolygonCount();
    if(!polyObject || !pointCount) {
        LogWarn("ignoring mesh with zero vertices or faces");
        return nullptr;
@ -387,7 +380,7 @@ aiMesh* C4DImporter::ReadMesh(BaseObject* object) {
    unsigned int vcount = 0;

    // first count vertices
-    for (Int32 i = 0; i < polyCount; i++)
+    for (LONG i = 0; i < polyCount; i++)
    {
        vcount += 3;

@ -430,7 +423,7 @@ aiMesh* C4DImporter::ReadMesh(BaseObject* object) {
    }

    // copy vertices and extra channels over and populate faces
-    for (Int32 i = 0; i < polyCount; ++i, ++face) {
+    for (LONG i = 0; i < polyCount; ++i, ++face) {
        ai_assert(polys[i].a < pointCount && polys[i].a >= 0);
        const Vector& pointA = points[polys[i].a];
        verts->x = pointA.x;
@ -507,7 +500,7 @@ aiMesh* C4DImporter::ReadMesh(BaseObject* object) {
        if (tangents_src) {

            for(unsigned int k = 0; k < face->mNumIndices; ++k) {
-                Int32 l;
+                LONG l;
                switch(k) {
                case 0:
                    l = polys[i].a;
--- a/code/AssetLib/C4D/C4DImporter.h
+++ b/code/AssetLib/C4D/C4DImporter.h
@ -78,8 +78,6 @@ namespace Assimp  {
 // -------------------------------------------------------------------------------------------
 class C4DImporter : public BaseImporter, public LogFunctions<C4DImporter> {
 public:
-    C4DImporter();
-    ~C4DImporter() override;
    bool CanRead( const std::string& pFile, IOSystem*, bool checkSig) const override;

 protected:
--- a/code/AssetLib/COB/COBLoader.cpp
+++ b/code/AssetLib/COB/COBLoader.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

@ -61,11 +61,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #include <memory>

-namespace Assimp {
+using namespace Assimp;
 using namespace Assimp::COB;
 using namespace Assimp::Formatter;

-static constexpr float units[] = {
+static const float units[] = {
    1000.f,
    100.f,
    1.f,
@ -76,7 +76,7 @@ static constexpr float units[] = {
    1.f / 1609.344f
 };

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "TrueSpace Object Importer",
    "",
    "",
@ -89,11 +89,31 @@ static constexpr aiImporterDesc desc = {
    "cob scn"
 };

+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+COBImporter::COBImporter() {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+COBImporter::~COBImporter() {
+    // empty
+}
+
 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool COBImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
-    static const char *tokens[] = { "Caligary" };
-    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+bool COBImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const {
+    const std::string &extension = GetExtension(pFile);
+    if (extension == "cob" || extension == "scn" || extension == "COB" || extension == "SCN") {
+        return true;
+    }
+
+    else if ((!extension.length() || checkSig) && pIOHandler) {
+        const char *tokens[] = { "Caligary" };
+        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 1);
+    }
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
@ -150,7 +170,7 @@ void COBImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
    // sort faces by material indices
    for (std::shared_ptr<Node> &n : scene.nodes) {
        if (n->type == Node::TYPE_MESH) {
-            Mesh &mesh = (Mesh &)(*n);
+            Mesh &mesh = (Mesh &)(*n.get());
            for (Face &f : mesh.faces) {
                mesh.temp_map[f.material].push_back(&f);
            }
@ -160,7 +180,7 @@ void COBImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
    // count meshes
    for (std::shared_ptr<Node> &n : scene.nodes) {
        if (n->type == Node::TYPE_MESH) {
-            Mesh &mesh = (Mesh &)(*n);
+            Mesh &mesh = (Mesh &)(*n.get());
            if (mesh.vertex_positions.size() && mesh.texture_coords.size()) {
                pScene->mNumMeshes += static_cast<unsigned int>(mesh.temp_map.size());
            }
@ -203,14 +223,14 @@ void COBImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
        }
    }

-    pScene->mRootNode = BuildNodes(*root, scene, pScene);
+    pScene->mRootNode = BuildNodes(*root.get(), scene, pScene);
    //flip normals after import
    FlipWindingOrderProcess flip;
    flip.Execute(pScene);
 }

 // ------------------------------------------------------------------------------------------------
-void ConvertTexture(const std::shared_ptr<Texture> &tex, aiMaterial *out, aiTextureType type) {
+void ConvertTexture(std::shared_ptr<Texture> tex, aiMaterial *out, aiTextureType type) {
    const aiString path(tex->path);
    out->AddProperty(&path, AI_MATKEY_TEXTURE(type, 0));
    out->AddProperty(&tex->transform, 1, AI_MATKEY_UVTRANSFORM(type, 0));
@ -372,12 +392,10 @@ aiNode *COBImporter::BuildNodes(const Node &root, const Scene &scin, aiScene *fi
    }

    // add children recursively
-    if (!root.temp_children.empty()) {
    nd->mChildren = new aiNode *[root.temp_children.size()]();
    for (const Node *n : root.temp_children) {
        (nd->mChildren[nd->mNumChildren++] = BuildNodes(*n, scin, fill))->mParent = nd;
    }
-    }

    return nd;
 }
@ -475,9 +493,8 @@ void COBImporter::ReadBasicNodeInfo_Ascii(Node &msh, LineSplitter &splitter, con
        } else if (splitter.match_start("Transform")) {
            for (unsigned int y = 0; y < 4 && ++splitter; ++y) {
                const char *s = splitter->c_str();
-                const char *end = s + splitter->size();
                for (unsigned int x = 0; x < 4; ++x) {
-                    SkipSpaces(&s, end);
+                    SkipSpaces(&s);
                    msh.transform[y][x] = fast_atof(&s);
                }
            }
@ -489,12 +506,12 @@ void COBImporter::ReadBasicNodeInfo_Ascii(Node &msh, LineSplitter &splitter, con

 // ------------------------------------------------------------------------------------------------
 template <typename T>
-void COBImporter::ReadFloat3Tuple_Ascii(T &fill, const char **in, const char *end) {
+void COBImporter::ReadFloat3Tuple_Ascii(T &fill, const char **in) {
    const char *rgb = *in;
    for (unsigned int i = 0; i < 3; ++i) {
-        SkipSpaces(&rgb, end);
+        SkipSpaces(&rgb);
        if (*rgb == ',') ++rgb;
-        SkipSpaces(&rgb, end);
+        SkipSpaces(&rgb);

        fill[i] = fast_atof(&rgb);
    }
@ -513,7 +530,7 @@ void COBImporter::ReadMat1_Ascii(Scene &out, LineSplitter &splitter, const Chunk
        return;
    }

-    out.materials.emplace_back();
+    out.materials.push_back(Material());
    Material &mat = out.materials.back();
    mat = nfo;

@ -541,7 +558,7 @@ void COBImporter::ReadMat1_Ascii(Scene &out, LineSplitter &splitter, const Chunk
    }

    const char *rgb = splitter[1];
-    ReadFloat3Tuple_Ascii(mat.rgb, &rgb, splitter.getEnd());
+    ReadFloat3Tuple_Ascii(mat.rgb, &rgb);

    ++splitter;
    if (!splitter.match_start("alpha ")) {
@ -569,7 +586,7 @@ void COBImporter::ReadUnit_Ascii(Scene &out, LineSplitter &splitter, const Chunk
        return;
    }

-    // parent chunks preceede their children, so we should have the
+    // parent chunks preceede their childs, so we should have the
    // corresponding chunk already.
    for (std::shared_ptr<Node> &nd : out.nodes) {
        if (nd->id == nfo.parent_id) {
@ -620,21 +637,20 @@ void COBImporter::ReadLght_Ascii(Scene &out, LineSplitter &splitter, const Chunk
    }

    const char *rgb = splitter[1];
-    const char *end = splitter.getEnd();
-    ReadFloat3Tuple_Ascii(msh.color, &rgb, end);
+    ReadFloat3Tuple_Ascii(msh.color, &rgb);

-    SkipSpaces(&rgb, end);
+    SkipSpaces(&rgb);
    if (strncmp(rgb, "cone angle", 10) != 0) {
        ASSIMP_LOG_WARN("Expected `cone angle` entity in `color` line in `Lght` chunk ", nfo.id);
    }
-    SkipSpaces(rgb + 10, &rgb, end);
+    SkipSpaces(rgb + 10, &rgb);
    msh.angle = fast_atof(&rgb);

-    SkipSpaces(&rgb, end);
+    SkipSpaces(&rgb);
    if (strncmp(rgb, "inner angle", 11) != 0) {
        ASSIMP_LOG_WARN("Expected `inner angle` entity in `color` line in `Lght` chunk ", nfo.id);
    }
-    SkipSpaces(rgb + 11, &rgb, end);
+    SkipSpaces(rgb + 11, &rgb);
    msh.inner_angle = fast_atof(&rgb);

    // skip the rest for we can't handle this kind of physically-based lighting information.
@ -652,7 +668,7 @@ void COBImporter::ReadCame_Ascii(Scene &out, LineSplitter &splitter, const Chunk

    ReadBasicNodeInfo_Ascii(msh, ++splitter, nfo);

-    // skip the next line, we don't know this differentiation between a
+    // skip the next line, we don't know this differenciation between a
    // standard camera and a panoramic camera.
    ++splitter;
 }
@ -707,14 +723,14 @@ void COBImporter::ReadPolH_Ascii(Scene &out, LineSplitter &splitter, const Chunk

            for (unsigned int cur = 0; cur < cnt && ++splitter; ++cur) {
                const char *s = splitter->c_str();
-                const char *end = splitter.getEnd();
+
                aiVector3D &v = msh.vertex_positions[cur];

-                SkipSpaces(&s, end);
+                SkipSpaces(&s);
                v.x = fast_atof(&s);
-                SkipSpaces(&s, end);
+                SkipSpaces(&s);
                v.y = fast_atof(&s);
-                SkipSpaces(&s, end);
+                SkipSpaces(&s);
                v.z = fast_atof(&s);
            }
        } else if (splitter.match_start("Texture Vertices")) {
@ -723,13 +739,12 @@ void COBImporter::ReadPolH_Ascii(Scene &out, LineSplitter &splitter, const Chunk

            for (unsigned int cur = 0; cur < cnt && ++splitter; ++cur) {
                const char *s = splitter->c_str();
-                const char *end = splitter.getEnd();

                aiVector2D &v = msh.texture_coords[cur];

-                SkipSpaces(&s, end);
+                SkipSpaces(&s);
                v.x = fast_atof(&s);
-                SkipSpaces(&s, end);
+                SkipSpaces(&s);
                v.y = fast_atof(&s);
            }
        } else if (splitter.match_start("Faces")) {
@ -746,7 +761,7 @@ void COBImporter::ReadPolH_Ascii(Scene &out, LineSplitter &splitter, const Chunk
                    ThrowException("Expected Face line");
                }

-                msh.faces.emplace_back();
+                msh.faces.push_back(Face());
                Face &face = msh.faces.back();

                face.indices.resize(strtoul10(splitter[2]));
@ -754,9 +769,8 @@ void COBImporter::ReadPolH_Ascii(Scene &out, LineSplitter &splitter, const Chunk
                face.material = strtoul10(splitter[6]);

                const char *s = (++splitter)->c_str();
-                const char *end = splitter.getEnd();
                for (size_t i = 0; i < face.indices.size(); ++i) {
-                    if (!SkipSpaces(&s, end)) {
+                    if (!SkipSpaces(&s)) {
                        ThrowException("Expected EOL token in Face entry");
                    }
                    if ('<' != *s++) {
@ -866,7 +880,7 @@ void COBImporter::ReadBinaryFile(Scene &out, StreamReaderLE *reader) {
        return;
    }

-    while (true) {
+    while (1) {
        std::string type;
        type += reader->GetI1();
        type += reader->GetI1();
@ -950,7 +964,7 @@ void COBImporter::ReadPolH_Binary(COB::Scene &out, StreamReaderLE &reader, const
                ThrowException(format("A hole is the first entity in the `PolH` chunk with id ") << nfo.id);
            }
        } else
-            msh.faces.emplace_back();
+            msh.faces.push_back(Face());
        Face &f = msh.faces.back();

        const size_t num = reader.GetI2();
@ -962,7 +976,7 @@ void COBImporter::ReadPolH_Binary(COB::Scene &out, StreamReaderLE &reader, const
        }

        for (size_t x = 0; x < num; ++x) {
-            f.indices.emplace_back();
+            f.indices.push_back(VertexIndex());

            VertexIndex &v = f.indices.back();
            v.pos_idx = reader.GetI4();
@ -1002,7 +1016,7 @@ void COBImporter::ReadMat1_Binary(COB::Scene &out, StreamReaderLE &reader, const

    const chunk_guard cn(nfo, reader);

-    out.materials.emplace_back();
+    out.materials.push_back(Material());
    Material &mat = out.materials.back();
    mat = nfo;

@ -1052,7 +1066,7 @@ void COBImporter::ReadMat1_Binary(COB::Scene &out, StreamReaderLE &reader, const
    id[0] = reader.GetI1(), id[1] = reader.GetI1();

    if (id[0] == 'e' && id[1] == ':') {
-        mat.tex_env = std::make_shared<Texture>();
+        mat.tex_env.reset(new Texture());

        reader.GetI1();
        ReadString_Binary(mat.tex_env->path, reader);
@ -1062,7 +1076,7 @@ void COBImporter::ReadMat1_Binary(COB::Scene &out, StreamReaderLE &reader, const
    }

    if (id[0] == 't' && id[1] == ':') {
-        mat.tex_color = std::make_shared<Texture>();
+        mat.tex_color.reset(new Texture());

        reader.GetI1();
        ReadString_Binary(mat.tex_color->path, reader);
@ -1078,7 +1092,7 @@ void COBImporter::ReadMat1_Binary(COB::Scene &out, StreamReaderLE &reader, const
    }

    if (id[0] == 'b' && id[1] == ':') {
-        mat.tex_bump = std::make_shared<Texture>();
+        mat.tex_bump.reset(new Texture());

        reader.GetI1();
        ReadString_Binary(mat.tex_bump->path, reader);
@ -1155,7 +1169,7 @@ void COBImporter::ReadUnit_Binary(COB::Scene &out, StreamReaderLE &reader, const

    const chunk_guard cn(nfo, reader);

-    // parent chunks preceede their children, so we should have the
+    // parent chunks preceede their childs, so we should have the
    // corresponding chunk already.
    for (std::shared_ptr<Node> &nd : out.nodes) {
        if (nd->id == nfo.parent_id) {
@ -1170,6 +1184,4 @@ void COBImporter::ReadUnit_Binary(COB::Scene &out, StreamReaderLE &reader, const
    ASSIMP_LOG_WARN("`Unit` chunk ", nfo.id, " is a child of ", nfo.parent_id, " which does not exist");
 }

-}
-
 #endif // ASSIMP_BUILD_NO_COB_IMPORTER
--- a/code/AssetLib/COB/COBLoader.h
+++ b/code/AssetLib/COB/COBLoader.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -52,99 +52,103 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 struct aiNode;

 namespace Assimp    {
-class LineSplitter;
+    class LineSplitter;

-// TinyFormatter.h
-namespace Formatter {
-    template <typename T, typename TR, typename A>
-    class basic_formatter;
-    typedef class basic_formatter<char, std::char_traits<char>, std::allocator<char>> format;
-} // namespace Formatter
+    // TinyFormatter.h
+    namespace Formatter {
+        template <typename T,typename TR, typename A> class basic_formatter;
+        typedef class basic_formatter< char, std::char_traits<char>, std::allocator<char> > format;
+    }

-// COBScene.h
-namespace COB {
+    // COBScene.h
+    namespace COB {
        struct ChunkInfo;
        struct Node;
        struct Scene;
-} // namespace COB
+    }

 // -------------------------------------------------------------------------------------------
 /** Importer class to load TrueSpace files (cob,scn) up to v6.
 *
 *  Currently relatively limited, loads only ASCII files and needs more test coverage. */
 // -------------------------------------------------------------------------------------------
-class COBImporter : public BaseImporter {
+class COBImporter : public BaseImporter
+{
 public:
-    COBImporter() = default;
-    ~COBImporter() override = default;
+    COBImporter();
+    ~COBImporter();
    
    // --------------------
-    bool CanRead(const std::string &pFile, IOSystem *pIOHandler,
-            bool checkSig) const override;
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
+        bool checkSig) const;

 protected:
-    // --------------------
-    const aiImporterDesc *GetInfo() const override;

    // --------------------
-    void SetupProperties(const Importer *pImp) override;
+    const aiImporterDesc* GetInfo () const;

    // --------------------
-    void InternReadFile(const std::string &pFile, aiScene *pScene,
-            IOSystem *pIOHandler) override;
+    void SetupProperties(const Importer* pImp);
+
+    // --------------------
+    void InternReadFile( const std::string& pFile, aiScene* pScene,
+        IOSystem* pIOHandler);

 private:
+
    // -------------------------------------------------------------------
    /** Prepend 'COB: ' and throw msg.*/
-    AI_WONT_RETURN static void ThrowException(const std::string &msg) AI_WONT_RETURN_SUFFIX;
+    AI_WONT_RETURN static void ThrowException(const std::string& msg) AI_WONT_RETURN_SUFFIX;

    // -------------------------------------------------------------------
    /** @brief Read from an ascii scene/object file
     *  @param out Receives output data.
     *  @param stream Stream to read from. */
-    void ReadAsciiFile(COB::Scene &out, StreamReaderLE *stream);
+    void ReadAsciiFile(COB::Scene& out, StreamReaderLE* stream);

    // -------------------------------------------------------------------
    /** @brief Read from a binary scene/object file
     *  @param out Receives output data.
     *  @param stream Stream to read from.  */
-    void ReadBinaryFile(COB::Scene &out, StreamReaderLE *stream);
+    void ReadBinaryFile(COB::Scene& out, StreamReaderLE* stream);

    // Conversion to Assimp output format
-    aiNode *BuildNodes(const COB::Node &root, const COB::Scene &scin, aiScene *fill);
+
+    aiNode* BuildNodes(const COB::Node& root,const COB::Scene& scin,aiScene* fill);

 private:
    // ASCII file support

-    void UnsupportedChunk_Ascii(LineSplitter &splitter, const COB::ChunkInfo &nfo, const char *name);
-    void ReadChunkInfo_Ascii(COB::ChunkInfo &out, const LineSplitter &splitter);
-    void ReadBasicNodeInfo_Ascii(COB::Node &msh, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    template <typename T>
-    void ReadFloat3Tuple_Ascii(T &fill, const char **in, const char *end);
+    void UnsupportedChunk_Ascii(LineSplitter& splitter, const COB::ChunkInfo& nfo, const char* name);
+    void ReadChunkInfo_Ascii(COB::ChunkInfo& out, const LineSplitter& splitter);
+    void ReadBasicNodeInfo_Ascii(COB::Node& msh, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    template <typename T> void ReadFloat3Tuple_Ascii(T& fill, const char** in);
+
+    void ReadPolH_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadBitM_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadMat1_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadGrou_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadBone_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadCame_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadLght_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadUnit_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);
+    void ReadChan_Ascii(COB::Scene& out, LineSplitter& splitter, const COB::ChunkInfo& nfo);

-    void ReadPolH_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadBitM_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadMat1_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadGrou_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadBone_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadCame_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadLght_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadUnit_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);
-    void ReadChan_Ascii(COB::Scene &out, LineSplitter &splitter, const COB::ChunkInfo &nfo);

    // Binary file support

-    void UnsupportedChunk_Binary(StreamReaderLE &reader, const COB::ChunkInfo &nfo, const char *name);
-    void ReadString_Binary(std::string &out, StreamReaderLE &reader);
-    void ReadBasicNodeInfo_Binary(COB::Node &msh, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
+    void UnsupportedChunk_Binary(StreamReaderLE& reader, const COB::ChunkInfo& nfo, const char* name);
+    void ReadString_Binary(std::string& out, StreamReaderLE& reader);
+    void ReadBasicNodeInfo_Binary(COB::Node& msh, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+
+    void ReadPolH_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+    void ReadBitM_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+    void ReadMat1_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+    void ReadCame_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+    void ReadLght_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+    void ReadGrou_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);
+    void ReadUnit_Binary(COB::Scene& out, StreamReaderLE& reader, const COB::ChunkInfo& nfo);

-    void ReadPolH_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
-    void ReadBitM_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
-    void ReadMat1_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
-    void ReadCame_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
-    void ReadLght_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
-    void ReadGrou_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);
-    void ReadUnit_Binary(COB::Scene &out, StreamReaderLE &reader, const COB::ChunkInfo &nfo);

 }; // !class COBImporter

--- a/code/AssetLib/COB/COBScene.h
+++ b/code/AssetLib/COB/COBScene.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -42,16 +43,16 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file  COBScene.h
 *  @brief Utilities for the COB importer.
 */
-#pragma once
 #ifndef INCLUDED_AI_COB_SCENE_H
 #define INCLUDED_AI_COB_SCENE_H

-#include <assimp/BaseImporter.h>
-#include <assimp/material.h>
-
+#include <memory>
 #include <deque>
 #include <map>

+#include <assimp/BaseImporter.h>
+#include <assimp/material.h>
+
 namespace Assimp {
 namespace COB {

@ -107,7 +108,7 @@ struct Node : public ChunkInfo
        TYPE_MESH,TYPE_GROUP,TYPE_LIGHT,TYPE_CAMERA,TYPE_BONE
    };

-    virtual ~Node() = default;
+    virtual ~Node() {}
    Node(Type type) : type(type), unit_scale(1.f){}

    Type type;
--- a/code/AssetLib/CSM/CSMLoader.cpp
+++ b/code/AssetLib/CSM/CSMLoader.cpp
@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team



@ -44,6 +44,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file  CSMLoader.cpp
 *  Implementation of the CSM importer class.
 */
+
+
+
 #ifndef ASSIMP_BUILD_NO_CSM_IMPORTER

 #include "CSMLoader.h"
@ -60,7 +63,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 using namespace Assimp;

-static constexpr aiImporterDesc desc = {
+static const aiImporterDesc desc = {
    "CharacterStudio Motion Importer (MoCap)",
    "",
    "",
@ -76,26 +79,43 @@ static constexpr aiImporterDesc desc = {

 // ------------------------------------------------------------------------------------------------
 // Constructor to be privately used by Importer
-CSMImporter::CSMImporter() : noSkeletonMesh(){
-    // empty
-}
+CSMImporter::CSMImporter()
+: noSkeletonMesh()
+{}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+CSMImporter::~CSMImporter()
+{}

 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool CSMImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool /*checkSig*/) const {
-    static const char* tokens[] = {"$Filename"};
-    return SearchFileHeaderForToken(pIOHandler,pFile,tokens,AI_COUNT_OF(tokens));
+bool CSMImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
+{
+    // check file extension
+    const std::string extension = GetExtension(pFile);
+
+    if( extension == "csm")
+        return true;
+
+    if ((checkSig || !extension.length()) && pIOHandler) {
+        const char* tokens[] = {"$Filename"};
+        return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
+    }
+    return false;
 }

 // ------------------------------------------------------------------------------------------------
 // Build a string of all file extensions supported
-const aiImporterDesc* CSMImporter::GetInfo () const {
+const aiImporterDesc* CSMImporter::GetInfo () const
+{
    return &desc;
 }

 // ------------------------------------------------------------------------------------------------
 // Setup configuration properties for the loader
-void CSMImporter::SetupProperties(const Importer* pImp) {
+void CSMImporter::SetupProperties(const Importer* pImp)
+{
    noSkeletonMesh = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_NO_SKELETON_MESHES,0) != 0;
 }

@ -107,7 +127,7 @@ void CSMImporter::InternReadFile( const std::string& pFile,
    std::unique_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

    // Check whether we can read from the file
-    if (file == nullptr) {
+    if( file.get() == nullptr) {
        throw DeadlyImportError( "Failed to open CSM file ", pFile, ".");
    }

@ -115,38 +135,38 @@ void CSMImporter::InternReadFile( const std::string& pFile,
    std::vector<char> mBuffer2;
    TextFileToBuffer(file.get(),mBuffer2);
    const char* buffer = &mBuffer2[0];
-    const char *end = &mBuffer2[mBuffer2.size() - 1] + 1;
+
    std::unique_ptr<aiAnimation> anim(new aiAnimation());
    int first = 0, last = 0x00ffffff;

    // now process the file and look out for '$' sections
-    while (true) {
-        SkipSpaces(&buffer, end);
+    while (1)   {
+        SkipSpaces(&buffer);
        if ('\0' == *buffer)
            break;

        if ('$'  == *buffer)    {
            ++buffer;
            if (TokenMatchI(buffer,"firstframe",10))    {
-                SkipSpaces(&buffer, end);
+                SkipSpaces(&buffer);
                first = strtol10(buffer,&buffer);
            }
            else if (TokenMatchI(buffer,"lastframe",9))     {
-                SkipSpaces(&buffer, end);
+                SkipSpaces(&buffer);
                last = strtol10(buffer,&buffer);
            }
            else if (TokenMatchI(buffer,"rate",4))  {
-                SkipSpaces(&buffer, end);
-                float d = { 0.0f };
+                SkipSpaces(&buffer);
+                float d;
                buffer = fast_atoreal_move<float>(buffer,d);
                anim->mTicksPerSecond = d;
            }
            else if (TokenMatchI(buffer,"order",5)) {
                std::vector< aiNodeAnim* > anims_temp;
                anims_temp.reserve(30);
-                while (true) {
-                    SkipSpaces(&buffer, end);
-                    if (IsLineEnd(*buffer) && SkipSpacesAndLineEnd(&buffer, end) && *buffer == '$')
+                while (1)   {
+                    SkipSpaces(&buffer);
+                    if (IsLineEnd(*buffer) && SkipSpacesAndLineEnd(&buffer) && *buffer == '$')
                        break; // next section

                    // Construct a new node animation channel and setup its name
@ -154,43 +174,41 @@ void CSMImporter::InternReadFile( const std::string& pFile,
                    aiNodeAnim* nda = anims_temp.back();

                    char* ot = nda->mNodeName.data;
-                    while (!IsSpaceOrNewLine(*buffer)) {
+                    while (!IsSpaceOrNewLine(*buffer))
                        *ot++ = *buffer++;
-                    }

                    *ot = '\0';
                    nda->mNodeName.length = static_cast<ai_uint32>(ot-nda->mNodeName.data);
                }

                anim->mNumChannels = static_cast<unsigned int>(anims_temp.size());
-                if (!anim->mNumChannels) {
+                if (!anim->mNumChannels)
                    throw DeadlyImportError("CSM: Empty $order section");
-                }

                // copy over to the output animation
                anim->mChannels = new aiNodeAnim*[anim->mNumChannels];
                ::memcpy(anim->mChannels,&anims_temp[0],sizeof(aiNodeAnim*)*anim->mNumChannels);
-            } else if (TokenMatchI(buffer,"points",6)) {
-                if (!anim->mNumChannels) {
-                    throw DeadlyImportError("CSM: \'$order\' section is required to appear prior to \'$points\'");
            }
+            else if (TokenMatchI(buffer,"points",6))    {
+                if (!anim->mNumChannels)
+                    throw DeadlyImportError("CSM: \'$order\' section is required to appear prior to \'$points\'");

                // If we know how many frames we'll read, we can preallocate some storage
                unsigned int alloc = 100;
-                if (last != 0x00ffffff) {
+                if (last != 0x00ffffff)
+                {
                    alloc = last-first;
                    alloc += alloc>>2u; // + 25%
-                    for (unsigned int i = 0; i < anim->mNumChannels; ++i) {
+                    for (unsigned int i = 0; i < anim->mNumChannels;++i)
                        anim->mChannels[i]->mPositionKeys = new aiVectorKey[alloc];
                }
-                }

                unsigned int filled = 0;

                // Now read all point data.
-                while (true) {
-                    SkipSpaces(&buffer, end);
-                    if (IsLineEnd(*buffer) && (!SkipSpacesAndLineEnd(&buffer, end) || *buffer == '$'))   {
+                while (1)   {
+                    SkipSpaces(&buffer);
+                    if (IsLineEnd(*buffer) && (!SkipSpacesAndLineEnd(&buffer) || *buffer == '$'))   {
                        break; // next section
                    }

@ -201,8 +219,8 @@ void CSMImporter::InternReadFile( const std::string& pFile,
                    for (unsigned int i = 0; i < anim->mNumChannels;++i)    {

                        aiNodeAnim* s = anim->mChannels[i];
-                        if (s->mNumPositionKeys == alloc)   {
-                            // need to reallocate?
+                        if (s->mNumPositionKeys == alloc)   { /* need to reallocate? */
+
                            aiVectorKey* old = s->mPositionKeys;
                            s->mPositionKeys = new aiVectorKey[s->mNumPositionKeys = alloc*2];
                            ::memcpy(s->mPositionKeys,old,sizeof(aiVectorKey)*alloc);
@ -210,26 +228,24 @@ void CSMImporter::InternReadFile( const std::string& pFile,
                        }

                        // read x,y,z
-                        if (!SkipSpacesAndLineEnd(&buffer, end)) {
+                        if(!SkipSpacesAndLineEnd(&buffer))
                            throw DeadlyImportError("CSM: Unexpected EOF occurred reading sample x coord");
-                        }

                        if (TokenMatchI(buffer, "DROPOUT", 7))  {
                            // seems this is invalid marker data; at least the doc says it's possible
                            ASSIMP_LOG_WARN("CSM: Encountered invalid marker data (DROPOUT)");
-                        } else {
+                        }
+                        else    {
                            aiVectorKey* sub = s->mPositionKeys + s->mNumPositionKeys;
                            sub->mTime = (double)frame;
                            buffer = fast_atoreal_move<float>(buffer, (float&)sub->mValue.x);

-                            if (!SkipSpacesAndLineEnd(&buffer, end)) {
+                            if(!SkipSpacesAndLineEnd(&buffer))
                                throw DeadlyImportError("CSM: Unexpected EOF occurred reading sample y coord");
-                            }
                            buffer = fast_atoreal_move<float>(buffer, (float&)sub->mValue.y);

-                            if (!SkipSpacesAndLineEnd(&buffer, end)) {
+                            if(!SkipSpacesAndLineEnd(&buffer))
                                throw DeadlyImportError("CSM: Unexpected EOF occurred reading sample z coord");
-                            }
                            buffer = fast_atoreal_move<float>(buffer, (float&)sub->mValue.z);

                            ++s->mNumPositionKeys;
@ -237,22 +253,22 @@ void CSMImporter::InternReadFile( const std::string& pFile,
                    }

                    // update allocation granularity
-                    if (filled == alloc) {
+                    if (filled == alloc)
                        alloc *= 2;
-                    }

                    ++filled;
                }
                // all channels must be complete in order to continue safely.
                for (unsigned int i = 0; i < anim->mNumChannels;++i)    {
-                    if (!anim->mChannels[i]->mNumPositionKeys) {
+
+                    if (!anim->mChannels[i]->mNumPositionKeys)
                        throw DeadlyImportError("CSM: Invalid marker track");
                }
            }
        }
-        } else {
+        else    {
            // advance to the next line
-            SkipLine(&buffer, end);
+            SkipLine(&buffer);
        }
    }

--- a/code/AssetLib/CSM/CSMLoader.h
+++ b/code/AssetLib/CSM/CSMLoader.h
@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team
+

 All rights reserved.

@ -58,31 +59,35 @@ namespace Assimp {
 *  Link to file format specification:
 *  <max_8_dvd>\samples\Motion\Docs\CSM.rtf
 */
-class CSMImporter : public BaseImporter {
+class CSMImporter : public BaseImporter
+{
 public:
    CSMImporter();
-    ~CSMImporter() override = default;
+    ~CSMImporter();

+
+public:
    // -------------------------------------------------------------------
-    bool CanRead(const std::string &pFile, IOSystem *pIOHandler,
-            bool checkSig) const override;
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
+        bool checkSig) const;

 protected:
-    // -------------------------------------------------------------------
-    const aiImporterDesc *GetInfo() const override;

    // -------------------------------------------------------------------
-    void SetupProperties(const Importer *pImp) override;
+    const aiImporterDesc* GetInfo () const;

    // -------------------------------------------------------------------
-    void InternReadFile(const std::string &pFile, aiScene *pScene,
-            IOSystem *pIOHandler) override;
+    void SetupProperties(const Importer* pImp);
+
+    // -------------------------------------------------------------------
+    void InternReadFile( const std::string& pFile, aiScene* pScene,
+        IOSystem* pIOHandler);

 private:
+
    bool noSkeletonMesh;

-};
-
-} // namespace Assimp
-
+}; // end of class CSMImporter
+} // end of namespace Assimp
 #endif // AI_AC3DIMPORTER_H_INC
+
--- a/code/AssetLib/Collada/ColladaExporter.cpp
+++ b/code/AssetLib/Collada/ColladaExporter.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -91,7 +91,7 @@ void ExportSceneCollada(const char *pFile, IOSystem *pIOSystem, const aiScene *p
 // Encodes a string into a valid XML ID using the xsd:ID schema qualifications.
 static const std::string XMLIDEncode(const std::string &name) {
    const char XML_ID_CHARS[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_-.";
-    const unsigned int XML_ID_CHARS_COUNT = sizeof(XML_ID_CHARS) / sizeof(char) - 1;
+    const unsigned int XML_ID_CHARS_COUNT = sizeof(XML_ID_CHARS) / sizeof(char);

    if (name.length() == 0) {
        return name;
@ -154,7 +154,8 @@ ColladaExporter::ColladaExporter(const aiScene *pScene, IOSystem *pIOSystem, con

 // ------------------------------------------------------------------------------------------------
 // Destructor
-ColladaExporter::~ColladaExporter() = default;
+ColladaExporter::~ColladaExporter() {
+}

 // ------------------------------------------------------------------------------------------------
 // Starts writing the contents
@ -246,7 +247,7 @@ void ColladaExporter::WriteHeader() {
    }

    // Assimp root nodes can have meshes, Collada Scenes cannot
-    if (mScene->mRootNode->mNumChildren == 0 || mScene->mRootNode->mMeshes != nullptr) {
+    if (mScene->mRootNode->mNumChildren == 0 || mScene->mRootNode->mMeshes != 0) {
        mAdd_root_node = true;
    }

@ -448,7 +449,7 @@ void ColladaExporter::WriteLight(size_t pIndex) {
    PushTag();
    switch (light->mType) {
    case aiLightSource_AMBIENT:
-        WriteAmbientLight(light);
+        WriteAmbienttLight(light);
        break;
    case aiLightSource_DIRECTIONAL:
        WriteDirectionalLight(light);
@ -543,7 +544,7 @@ void ColladaExporter::WriteSpotLight(const aiLight *const light) {
    mOutput << startstr << "</spot>" << endstr;
 }

-void ColladaExporter::WriteAmbientLight(const aiLight *const light) {
+void ColladaExporter::WriteAmbienttLight(const aiLight *const light) {

    const aiColor3D &color = light->mColorAmbient;
    mOutput << startstr << "<ambient>" << endstr;
@ -1329,9 +1330,9 @@ void ColladaExporter::WriteAnimationLibrary(size_t pIndex) {
            std::vector<std::string> names;
            for (size_t i = 0; i < nodeAnim->mNumPositionKeys; ++i) {
                if (nodeAnim->mPreState == aiAnimBehaviour_DEFAULT || nodeAnim->mPreState == aiAnimBehaviour_LINEAR || nodeAnim->mPreState == aiAnimBehaviour_REPEAT) {
-                    names.emplace_back("LINEAR");
+                    names.push_back("LINEAR");
                } else if (nodeAnim->mPostState == aiAnimBehaviour_CONSTANT) {
-                    names.emplace_back("STEP");
+                    names.push_back("STEP");
                }
            }

--- a/code/AssetLib/Collada/ColladaExporter.h
+++ b/code/AssetLib/Collada/ColladaExporter.h
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team


 All rights reserved.
@ -101,7 +101,7 @@ protected:
    void WritePointLight(const aiLight *const light);
    void WriteDirectionalLight(const aiLight *const light);
    void WriteSpotLight(const aiLight *const light);
-    void WriteAmbientLight(const aiLight *const light);
+    void WriteAmbienttLight(const aiLight *const light);

    /// Writes the controller library
    void WriteControllerLibrary();
@ -233,7 +233,7 @@ public:
        Surface ambient, diffuse, specular, emissive, reflective, transparent, normal;
        Property shininess, transparency, index_refraction;

-        Material() = default;
+        Material() {}
    };

    std::map<unsigned int, std::string> textures;
--- a/code/AssetLib/Collada/ColladaHelper.cpp
+++ b/code/AssetLib/Collada/ColladaHelper.cpp
@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------

-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2021, assimp team

 All rights reserved.

--- a/Show More
+++ b/Show More