closes https://github.com/assimp/assimp/issues/1404: set name with merged meshes for output mesh.

code/3DSConverter.cpp

@@ -56,18 +56,19 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 using namespace Assimp;
 
+static const unsigned int NotSet = 0xcdcdcdcd;
+
 // ------------------------------------------------------------------------------------------------
 // Setup final material indices, generae a default material if necessary
 void Discreet3DSImporter::ReplaceDefaultMaterial()
 {
-
     // Try to find an existing material that matches the
     // typical default material setting:
     // - no textures
     // - diffuse color (in grey!)
     // NOTE: This is here to workaround the fact that some
     // exporters are writing a default material, too.
-    unsigned int idx = 0xcdcdcdcd;
+    unsigned int idx( NotSet );
     for (unsigned int i = 0; i < mScene->mMaterials.size();++i)
     {
         std::string s = mScene->mMaterials[i].mName;
@@ -93,7 +94,9 @@ void Discreet3DSImporter::ReplaceDefaultMaterial()
         }
         idx = i;
     }
-    if (0xcdcdcdcd == idx)idx = (unsigned int)mScene->mMaterials.size();
+    if ( NotSet == idx ) {
+        idx = ( unsigned int )mScene->mMaterials.size();
+    }
 
     // now iterate through all meshes and through all faces and
     // find all faces that are using the default material

code/SceneCombiner.cpp

@@ -58,6 +58,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "time.h"
 #include <assimp/DefaultLogger.hpp>
 #include <assimp/scene.h>
+#include <assimp/mesh.h>
 #include <stdio.h>
 #include "ScenePrivate.h"
 
@@ -757,7 +758,7 @@ void SceneCombiner::MergeBones(aiMesh* out,std::vector<aiMesh*>::const_iterator
 
 // ------------------------------------------------------------------------------------------------
 // Merge a list of meshes
-void SceneCombiner::MergeMeshes(aiMesh** _out,unsigned int /*flags*/,
+void SceneCombiner::MergeMeshes(aiMesh** _out, unsigned int /*flags*/,
     std::vector<aiMesh*>::const_iterator begin,
     std::vector<aiMesh*>::const_iterator end)
 {
@@ -772,8 +773,14 @@ void SceneCombiner::MergeMeshes(aiMesh** _out,unsigned int /*flags*/,
     aiMesh* out = *_out = new aiMesh();
     out->mMaterialIndex = (*begin)->mMaterialIndex;
 
+    std::string name;
     // Find out how much output storage we'll need
-    for (std::vector<aiMesh*>::const_iterator it = begin; it != end;++it)   {
+    for (std::vector<aiMesh*>::const_iterator it = begin; it != end; ++it) {
+        const char *meshName( (*it)->mName.C_Str() );
+        name += std::string( meshName );
+        if ( it != end - 1 ) {
+            name += ".";
+        }
         out->mNumVertices   += (*it)->mNumVertices;
         out->mNumFaces      += (*it)->mNumFaces;
         out->mNumBones      += (*it)->mNumBones;
@@ -781,6 +788,7 @@ void SceneCombiner::MergeMeshes(aiMesh** _out,unsigned int /*flags*/,
         // combine primitive type flags
         out->mPrimitiveTypes |= (*it)->mPrimitiveTypes;
     }
+    out->mName.Set( name.c_str() );
 
     if (out->mNumVertices) {
         aiVector3D* pv2;
@@ -789,7 +797,7 @@ void SceneCombiner::MergeMeshes(aiMesh** _out,unsigned int /*flags*/,
         if ((**begin).HasPositions())   {
 
             pv2 = out->mVertices = new aiVector3D[out->mNumVertices];
-            for (std::vector<aiMesh*>::const_iterator it = begin; it != end;++it)   {
+            for (std::vector<aiMesh*>::const_iterator it = begin; it != end; ++it)  {
                 if ((*it)->mVertices)   {
                     ::memcpy(pv2,(*it)->mVertices,(*it)->mNumVertices*sizeof(aiVector3D));
                 }
@@ -809,7 +817,7 @@ void SceneCombiner::MergeMeshes(aiMesh** _out,unsigned int /*flags*/,
                 pv2 += (*it)->mNumVertices;
             }
         }
-        // copy tangents and bitangents
+        // copy tangents and bi-tangents
         if ((**begin).HasTangentsAndBitangents())   {
 
             pv2 = out->mTangents = new aiVector3D[out->mNumVertices];

include/assimp/SceneCombiner.h

@@ -217,10 +217,9 @@ public:
     static void MergeScenes(aiScene** dest,std::vector<aiScene*>& src,
         unsigned int flags = 0);
 
-
     // -------------------------------------------------------------------
-    /** Merges two or more scenes and attaches all sceenes to a specific
-     *  position in the node graph of the masteer scene.
+    /** Merges two or more scenes and attaches all scenes to a specific
+     *  position in the node graph of the master scene.
      *
      *  @param dest Receives a pointer to the destination scene. If the
      *    pointer doesn't point to NULL when the function is called, the
@@ -236,7 +235,6 @@ public:
         std::vector<AttachmentInfo>& src,
         unsigned int flags = 0);
 
-
     // -------------------------------------------------------------------
     /** Merges two or more meshes
      *
@@ -255,7 +253,6 @@ public:
         std::vector<aiMesh*>::const_iterator begin,
         std::vector<aiMesh*>::const_iterator end);
 
-
     // -------------------------------------------------------------------
     /** Merges two or more bones
      *

test/CMakeLists.txt

@@ -116,6 +116,7 @@ SET( TEST_SRCS
   unit/utRemoveRedundantMaterials.cpp
   unit/utRemoveVCProcess.cpp
   unit/utScenePreprocessor.cpp
+  unit/utSceneCombiner.cpp
   unit/utSharedPPData.cpp
   unit/utStringUtils.cpp
   unit/utSMDImportExport.cpp

test/unit/utSceneCombiner.cpp

@@ -0,0 +1,70 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2017, 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 "UnitTestPCH.h"
+#include <assimp/SceneCombiner.h>
+#include <assimp/mesh.h>
+
+using namespace ::Assimp;
+
+class utSceneCombiner : public ::testing::Test {
+    // empty
+};
+
+TEST_F( utSceneCombiner, MergeMeshes_ValidNames_Test ) {
+    std::vector<aiMesh*> merge_list;
+    aiMesh *mesh1 = new aiMesh;
+    mesh1->mName.Set( "mesh_1" );
+    merge_list.push_back( mesh1 );
+
+    aiMesh *mesh2 = new aiMesh;
+    mesh2->mName.Set( "mesh_2" );
+    merge_list.push_back( mesh2 );
+
+    aiMesh *mesh3 = new aiMesh;
+    mesh3->mName.Set( "mesh_3" );
+    merge_list.push_back( mesh3 );
+
+    aiMesh *out( nullptr );
+    SceneCombiner::MergeMeshes( &out, 0, merge_list.begin(), merge_list.end() );
+    std::string outName = out->mName.C_Str();
+    EXPECT_EQ( "mesh_1.mesh_2.mesh_3", outName );
+}