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Merge branch 'master' into master

pull/3594/head
Kim Kulling 2021-01-22 12:35:44 +01:00 committed by GitHub
parent 8ba1d38dea 71e8c1001e
commit f2d3f0dbe6
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22
Build.md
View File

@ -1,6 +1,6 @@
# Build Instructions
# Build / Install Instructions
## Build on all platforms using vcpkg
## Install on all platforms using vcpkg
You can download and install assimp using the [vcpkg](https://github.com/Microsoft/vcpkg/) dependency manager:
```bash
git clone https://github.com/Microsoft/vcpkg.git
@ -11,6 +11,18 @@ You can download and install assimp using the [vcpkg](https://github.com/Microso
```
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 If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.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 install assimp
```
## Install pyassimp
You need to have pip installed:
```
pip install pyassimp
```
## Manual build instructions
### Install CMake
@ -24,6 +36,12 @@ Make sure you have a working git-installation. Open a command prompt and clone t
```bash
git clone https://github.com/assimp/assimp.git
```
### Build from source:
```bash
cd assimp
cmake CMakeLists.txt
cmake --build .
```
### Build instructions for Windows with Visual-Studio

35
CMakeLists.txt
View File

@ -61,7 +61,6 @@ OPTION( BUILD_SHARED_LIBS
"Build package with shared libraries."
ON
)
OPTION( ASSIMP_BUILD_FRAMEWORK
"Build package as Mac OS X Framework bundle."
OFF
@ -133,9 +132,22 @@ OPTION ( ASSIMP_IGNORE_GIT_HASH
)
IF ( WIN32 )
OPTION ( ASSIMP_BUILD_ASSIMP_VIEW
"If the Assimp view tool is built. (requires DirectX)"
OFF )
# 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
"Install MSVC debug files."
ON )
IF(NOT (MSVC_VERSION LESS 1900))
# Multibyte character set is deprecated since at least MSVC2015 (possibly earlier)
ADD_DEFINITIONS( -DUNICODE -D_UNICODE )
ENDIF()
ENDIF()
ENDIF()
IF (IOS AND NOT ASSIMP_HUNTER_ENABLED)
@ -145,21 +157,6 @@ IF (IOS AND NOT ASSIMP_HUNTER_ENABLED)
ADD_DEFINITIONS(-DENABLE_BITCODE)
ENDIF ()
# Use subset of Windows.h
if (WIN32)
ADD_DEFINITIONS( -DWIN32_LEAN_AND_MEAN )
endif()
IF(MSVC)
OPTION( ASSIMP_INSTALL_PDB
"Install MSVC debug files."
ON
)
IF(NOT (MSVC_VERSION LESS 1900))
# Multibyte character set is deprecated since at least MSVC2015 (possibly earlier)
ADD_DEFINITIONS( -DUNICODE -D_UNICODE )
ENDIF()
ENDIF()
IF (ASSIMP_BUILD_FRAMEWORK)
SET (BUILD_SHARED_LIBS ON)

28
code/AssetLib/glTF2/glTF2Importer.cpp
View File

@ -383,6 +383,22 @@ static inline bool CheckValidFacesIndices(aiFace *faces, unsigned nFaces, unsign
}
#endif // ASSIMP_BUILD_DEBUG
template<typename T>
aiColor4D* GetVertexColorsForType(glTF2::Ref<glTF2::Accessor> input) {
float max = std::numeric_limits<T>::max();
aiColor4t<T>* colors;
input->ExtractData(colors);
auto output = new aiColor4D[input->count];
for (size_t i = 0; i < input->count; i++) {
output[i] = aiColor4D(
colors[i].r / max, colors[i].g / max,
colors[i].b / max, colors[i].a / max
);
}
delete[] colors;
return output;
}
void glTF2Importer::ImportMeshes(glTF2::Asset &r) {
ASSIMP_LOG_DEBUG_F("Importing ", r.meshes.Size(), " meshes");
std::vector<std::unique_ptr<aiMesh>> meshes;
@ -463,7 +479,17 @@ void glTF2Importer::ImportMeshes(glTF2::Asset &r) {
"\" does not match the vertex count");
continue;
}
attr.color[c]->ExtractData(aim->mColors[c]);
auto componentType = attr.color[c]->componentType;
if (componentType == glTF2::ComponentType_FLOAT) {
attr.color[c]->ExtractData(aim->mColors[c]);
} else {
if (componentType == glTF2::ComponentType_UNSIGNED_BYTE) {
aim->mColors[c] = GetVertexColorsForType<unsigned char>(attr.color[c]);
} else if (componentType == glTF2::ComponentType_UNSIGNED_SHORT) {
aim->mColors[c] = GetVertexColorsForType<unsigned short>(attr.color[c]);
}
}
}
for (size_t tc = 0; tc < attr.texcoord.size() && tc < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++tc) {
if (!attr.texcoord[tc]) {

4
code/CMakeLists.txt
View File

@ -665,6 +665,10 @@ if (NOT ASSIMP_NO_EXPORT)
AssetLib/3MF/D3MFExporter.h
AssetLib/3MF/D3MFExporter.cpp)
ADD_ASSIMP_EXPORTER( PBRT
Pbrt/PbrtExporter.h
Pbrt/PbrtExporter.cpp)
ADD_ASSIMP_EXPORTER( ASSJSON
AssetLib/Assjson/cencode.c
AssetLib/Assjson/cencode.h

7
code/Common/Exporter.cpp
View File

@ -138,6 +138,9 @@ void ExportSceneM3DA(const char*, IOSystem*, const aiScene*, const ExportPropert
#ifndef ASSIMP_BUILD_NO_ASSJSON_EXPORTER
void ExportAssimp2Json(const char* , IOSystem*, const aiScene* , const Assimp::ExportProperties*);
#endif
#ifndef ASSIMP_BUILD_NO_PBRT_EXPORTER
void ExportScenePbrt(const char*, IOSystem*, const aiScene*, const ExportProperties*);
#endif
static void setupExporterArray(std::vector<Exporter::ExportFormatEntry> &exporters) {
(void)exporters;
@ -221,6 +224,10 @@ static void setupExporterArray(std::vector<Exporter::ExportFormatEntry> &exporte
exporters.push_back(Exporter::ExportFormatEntry("3mf", "The 3MF-File-Format", "3mf", &ExportScene3MF, 0));
#endif
#ifndef ASSIMP_BUILD_NO_PBRT_EXPORTER
exporters.push_back(Exporter::ExportFormatEntry("pbrt", "pbrt-v4 scene description file", "pbrt", &ExportScenePbrt, aiProcess_Triangulate | aiProcess_SortByPType));
#endif
#ifndef ASSIMP_BUILD_NO_ASSJSON_EXPORTER
exporters.push_back(Exporter::ExportFormatEntry("assjson", "Assimp JSON Document", "json", &ExportAssimp2Json, 0));
#endif

949
code/Pbrt/PbrtExporter.cpp 100644
View File

@ -0,0 +1,949 @@
/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
Copyright (c) 2006-2020, 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.
----------------------------------------------------------------------
*/
/* TODO:
Material improvements:
- don't export embedded textures that we're not going to use
- diffuse roughness
- what is with the uv mapping, uv transform not coming through??
- metal? glass? mirror? detect these better?
- eta/k from RGB?
- emissive textures: warn at least
Other:
- use aiProcess_GenUVCoords if needed to handle spherical/planar uv mapping?
- don't build up a big string in memory but write directly to a file
- aiProcess_Triangulate meshes to get triangles only?
- animation (allow specifying a time)
*/
#ifndef ASSIMP_BUILD_NO_EXPORT
#ifndef ASSIMP_BUILD_NO_PBRT_EXPORTER
#include "PbrtExporter.h"
#include <assimp/version.h>
#include <assimp/DefaultIOSystem.h>
#include <assimp/IOSystem.hpp>
#include <assimp/Exporter.hpp>
#include <assimp/DefaultLogger.hpp>
#include <assimp/StreamWriter.h>
#include <assimp/Exceptional.h>
#include <assimp/material.h>
#include <assimp/scene.h>
#include <assimp/mesh.h>
#include <algorithm>
#include <cctype>
#include <cmath>
#include <fstream>
#include <functional>
#include <iostream>
#include <memory>
#include <sstream>
#include <string>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
using namespace Assimp;
namespace Assimp {
void ExportScenePbrt (
const char* pFile,
IOSystem* pIOSystem,
const aiScene* pScene,
const ExportProperties* /*pProperties*/
){
std::string path = DefaultIOSystem::absolutePath(std::string(pFile));
std::string file = DefaultIOSystem::completeBaseName(std::string(pFile));
// initialize the exporter
PbrtExporter exporter(pScene, pIOSystem, path, file);
}
} // end of namespace Assimp
// Constructor
PbrtExporter::PbrtExporter (
const aiScene* pScene, IOSystem* pIOSystem,
const std::string path, const std::string file)
: mScene(pScene),
mIOSystem(pIOSystem),
mPath(path),
mFile(file)
{
// Export embedded textures.
if (mScene->mNumTextures > 0)
if (!mIOSystem->CreateDirectory("textures"))
throw DeadlyExportError("Could not create textures/ directory.");
for (unsigned int i = 0; i < mScene->mNumTextures; ++i) {
aiTexture* tex = mScene->mTextures[i];
std::string fn = CleanTextureFilename(tex->mFilename, false);
std::cerr << "Writing embedded texture: " << tex->mFilename.C_Str() << " -> "
<< fn << "\n";
std::unique_ptr<IOStream> outfile(mIOSystem->Open(fn, "wb"));
if (!outfile) {
throw DeadlyExportError("could not open output texture file: " + fn);
}
if (tex->mHeight == 0) {
// It's binary data
outfile->Write(tex->pcData, tex->mWidth, 1);
} else {
std::cerr << fn << ": TODO handle uncompressed embedded textures.\n";
}
}
#if 0
// Debugging: print the full node hierarchy
std::function<void(aiNode*, int)> visitNode;
visitNode = [&](aiNode* node, int depth) {
for (int i = 0; i < depth; ++i) std::cerr << " ";
std::cerr << node->mName.C_Str() << "\n";
for (int i = 0; i < node->mNumChildren; ++i)
visitNode(node->mChildren[i], depth + 1);
};
visitNode(mScene->mRootNode, 0);
#endif
mOutput.precision(ASSIMP_AI_REAL_TEXT_PRECISION);
// Write everything out
WriteMetaData();
WriteCameras();
WriteWorldDefinition();
// And write the file to disk...
std::unique_ptr<IOStream> outfile(mIOSystem->Open(mPath,"wt"));
if (!outfile) {
throw DeadlyExportError("could not open output .pbrt file: " + std::string(mFile));
}
outfile->Write(mOutput.str().c_str(), mOutput.str().length(), 1);
}
// Destructor
PbrtExporter::~PbrtExporter() {
// Empty
}
void PbrtExporter::WriteMetaData() {
mOutput << "#############################\n";
mOutput << "# Scene metadata:\n";
aiMetadata* pMetaData = mScene->mMetaData;
for (unsigned int i = 0; i < pMetaData->mNumProperties; i++) {
mOutput << "# - ";
mOutput << pMetaData->mKeys[i].C_Str() << " :";
switch(pMetaData->mValues[i].mType) {
case AI_BOOL : {
mOutput << " ";
if (*static_cast<bool*>(pMetaData->mValues[i].mData))
mOutput << "TRUE\n";
else
mOutput << "FALSE\n";
break;
}
case AI_INT32 : {
mOutput << " " <<
*static_cast<int32_t*>(pMetaData->mValues[i].mData) <<
std::endl;
break;
}
case AI_UINT64 :
mOutput << " " <<
*static_cast<uint64_t*>(pMetaData->mValues[i].mData) <<
std::endl;
break;
case AI_FLOAT :
mOutput << " " <<
*static_cast<float*>(pMetaData->mValues[i].mData) <<
std::endl;
break;
case AI_DOUBLE :
mOutput << " " <<
*static_cast<double*>(pMetaData->mValues[i].mData) <<
std::endl;
break;
case AI_AISTRING : {
aiString* value =
static_cast<aiString*>(pMetaData->mValues[i].mData);
std::string svalue = value->C_Str();
std::size_t found = svalue.find_first_of("\n");
mOutput << "\n";
while (found != std::string::npos) {
mOutput << "# " << svalue.substr(0, found) << "\n";
svalue = svalue.substr(found + 1);
found = svalue.find_first_of("\n");
}
mOutput << "# " << svalue << "\n";
break;
}
case AI_AIVECTOR3D :
// TODO
mOutput << " Vector3D (unable to print)\n";
break;
default:
// AI_META_MAX and FORCE_32BIT
mOutput << " META_MAX or FORCE_32Bit (unable to print)\n";
break;
}
}
}
void PbrtExporter::WriteCameras() {
mOutput << "\n";
mOutput << "###############################\n";
mOutput << "# Cameras (" << mScene->mNumCameras << ") total\n\n";
if (mScene->mNumCameras == 0) {
std::cerr << "Warning: No cameras found in scene file.\n";
return;
}
if (mScene->mNumCameras > 1) {
std::cerr << "Multiple cameras found in scene file; defaulting to first one specified.\n";
}
for (unsigned int i = 0; i < mScene->mNumCameras; i++) {
WriteCamera(i);
}
}
aiMatrix4x4 PbrtExporter::GetNodeTransform(const aiString &name) const {
aiMatrix4x4 m;
auto node = mScene->mRootNode->FindNode(name);
if (!node) {
std::cerr << '"' << name.C_Str() << "\": node not found in scene tree.\n";
throw DeadlyExportError("Could not find node");
}
else {
while (node) {
m = node->mTransformation * m;
node = node->mParent;
}
}
return m;
}
std::string PbrtExporter::TransformAsString(const aiMatrix4x4 &m) {
// Transpose on the way out to match pbrt's expected layout (sanity
// check: the translation component should be the last 3 entries
// before a '1' as the final entry in the matrix, assuming it's
// non-projective.)
std::stringstream s;
s << m.a1 << " " << m.b1 << " " << m.c1 << " " << m.d1 << " "
<< m.a2 << " " << m.b2 << " " << m.c2 << " " << m.d2 << " "
<< m.a3 << " " << m.b3 << " " << m.c3 << " " << m.d3 << " "
<< m.a4 << " " << m.b4 << " " << m.c4 << " " << m.d4;
return s.str();
}
void PbrtExporter::WriteCamera(int i) {
auto camera = mScene->mCameras[i];
bool cameraActive = i == 0;
mOutput << "# - Camera " << i+1 << ": "
<< camera->mName.C_Str() << "\n";
// Get camera aspect ratio
float aspect = camera->mAspect;
if (aspect == 0) {
aspect = 4.f/3.f;
mOutput << "# - Aspect ratio : 1.33333 (no aspect found, defaulting to 4/3)\n";
} else {
mOutput << "# - Aspect ratio : " << aspect << "\n";
}
// Get Film xres and yres
int xres = 1920;
int yres = (int)round(xres/aspect);
// Print Film for this camera
if (!cameraActive)
mOutput << "# ";
mOutput << "Film \"rgb\" \"string filename\" \"" << mFile << ".exr\"\n";
if (!cameraActive)
mOutput << "# ";
mOutput << " \"integer xresolution\" [" << xres << "]\n";
if (!cameraActive)
mOutput << "# ";
mOutput << " \"integer yresolution\" [" << yres << "]\n";
// Get camera fov
float hfov = AI_RAD_TO_DEG(camera->mHorizontalFOV);
float fov = (aspect >= 1.0) ? hfov : (hfov * aspect);
if (fov < 5) {
std::cerr << fov << ": suspiciously low field of view specified by camera. Setting to 45 degrees.\n";
fov = 45;
}
// Get camera transform
aiMatrix4x4 worldFromCamera = GetNodeTransform(camera->mName);
// Print Camera LookAt
auto position = worldFromCamera * camera->mPosition;
auto lookAt = worldFromCamera * (camera->mPosition + camera->mLookAt);
aiMatrix3x3 worldFromCamera3(worldFromCamera);
auto up = worldFromCamera3 * camera->mUp;
up.Normalize();
if (!cameraActive)
mOutput << "# ";
mOutput << "Scale -1 1 1\n"; // right handed -> left handed
if (!cameraActive)
mOutput << "# ";
mOutput << "LookAt "
<< position.x << " " << position.y << " " << position.z << "\n";
if (!cameraActive)
mOutput << "# ";
mOutput << " "
<< lookAt.x << " " << lookAt.y << " " << lookAt.z << "\n";
if (!cameraActive)
mOutput << "# ";
mOutput << " "
<< up.x << " " << up.y << " " << up.z << "\n";
// Print camera descriptor
if (!cameraActive)
mOutput << "# ";
mOutput << "Camera \"perspective\" \"float fov\" " << "[" << fov << "]\n\n";
}
void PbrtExporter::WriteWorldDefinition() {
// Figure out which meshes are referenced multiple times; those will be
// emitted as object instances and the rest will be emitted directly.
std::map<int, int> meshUses;
std::function<void(aiNode*)> visitNode;
visitNode = [&](aiNode* node) {
for (unsigned int i = 0; i < node->mNumMeshes; ++i)
++meshUses[node->mMeshes[i]];
for (unsigned int i = 0; i < node->mNumChildren; ++i)
visitNode(node->mChildren[i]);
};
visitNode(mScene->mRootNode);
int nInstanced = 0, nUnused = 0;
for (const auto &u : meshUses) {
if (u.second == 0) ++nUnused;
else if (u.second > 1) ++nInstanced;
}
std::cerr << nInstanced << " / " << mScene->mNumMeshes << " meshes instanced.\n";
if (nUnused)
std::cerr << nUnused << " meshes defined but not used in scene.\n";
mOutput << "WorldBegin\n";
WriteLights();
WriteTextures();
WriteMaterials();
// Object instance definitions
mOutput << "# Object instance definitions\n\n";
for (const auto &mu : meshUses) {
if (mu.second > 1) {
WriteInstanceDefinition(mu.first);
}
}
mOutput << "# Geometry\n\n";
aiMatrix4x4 worldFromObject;
WriteGeometricObjects(mScene->mRootNode, worldFromObject, meshUses);
}
void PbrtExporter::WriteTextures() {
mOutput << "###################\n";
mOutput << "# Textures\n\n";
C_STRUCT aiString path;
aiTextureMapping mapping;
unsigned int uvIndex;
ai_real blend;
aiTextureOp op;
aiTextureMapMode mapMode[3];
// For every material in the scene,
for (unsigned int m = 0 ; m < mScene->mNumMaterials; m++) {
auto material = mScene->mMaterials[m];
// Parse through all texture types,
for (int tt = 1; tt <= aiTextureType_UNKNOWN; tt++) {
int ttCount = material->GetTextureCount(aiTextureType(tt));
// ... and get every texture
for (int t = 0; t < ttCount; t++) {
// TODO write out texture specifics
// TODO UV transforms may be material specific
// so those may need to be baked into unique tex name
if (material->GetTexture(aiTextureType(tt), t, &path, &mapping,
&uvIndex, &blend, &op, mapMode) != AI_SUCCESS) {
std::cerr << "Error getting texture! " << m << " " << tt << " " << t << "\n";
continue;
}
std::string filename = CleanTextureFilename(path);
if (uvIndex != 0)
std::cerr << "Warning: texture \"" << filename << "\" uses uv set #" <<
uvIndex << " but the pbrt converter only exports uv set 0.\n";
#if 0
if (op != aiTextureOp_Multiply)
std::cerr << "Warning: unexpected texture op " << (int)op <<
" encountered for texture \"" <<
filename << "\". The resulting scene may have issues...\n";
if (blend != 1)
std::cerr << "Blend value of " << blend << " found for texture \"" << filename
<< "\" but not handled in converter.\n";
#endif
std::string mappingString;
#if 0
if (mapMode[0] != mapMode[1])
std::cerr << "Different texture boundary mode for u and v for texture \"" <<
filename << "\". Using u for both.\n";
switch (mapMode[0]) {
case aiTextureMapMode_Wrap:
// pbrt's default
break;
case aiTextureMapMode_Clamp:
mappingString = "\"string wrap\" \"clamp\"";
break;
case aiTextureMapMode_Decal:
std::cerr << "Decal texture boundary mode not supported by pbrt for texture \"" <<
filename << "\"\n";
break;
case aiTextureMapMode_Mirror:
std::cerr << "Mirror texture boundary mode not supported by pbrt for texture \"" <<
filename << "\"\n";
break;
default:
std::cerr << "Unexpected map mode " << (int)mapMode[0] << " for texture \"" <<
filename << "\"\n";
//throw DeadlyExportError("Unexpected aiTextureMapMode");
}
#endif
#if 0
aiUVTransform uvTransform;
if (material->Get(AI_MATKEY_TEXTURE(tt, t), uvTransform) == AI_SUCCESS) {
mOutput << "# UV transform " << uvTransform.mTranslation.x << " "
<< uvTransform.mTranslation.y << " " << uvTransform.mScaling.x << " "
<< uvTransform.mScaling.y << " " << uvTransform.mRotation << "\n";
}
#endif
std::string texName, texType, texOptions;
if (aiTextureType(tt) == aiTextureType_SHININESS ||
aiTextureType(tt) == aiTextureType_OPACITY ||
aiTextureType(tt) == aiTextureType_HEIGHT ||
aiTextureType(tt) == aiTextureType_DISPLACEMENT ||
aiTextureType(tt) == aiTextureType_METALNESS ||
aiTextureType(tt) == aiTextureType_DIFFUSE_ROUGHNESS) {
texType = "float";
texName = std::string("float:") + RemoveSuffix(filename);
if (aiTextureType(tt) == aiTextureType_SHININESS) {
texOptions = " \"bool invert\" true\n";
texName += "_Roughness";
}
} else if (aiTextureType(tt) == aiTextureType_DIFFUSE ||
aiTextureType(tt) == aiTextureType_BASE_COLOR) {
texType = "spectrum";
texName = std::string("rgb:") + RemoveSuffix(filename);
}
// Don't export textures we're not actually going to use...
if (texName.empty())
continue;
if (mTextureSet.find(texName) == mTextureSet.end()) {
mOutput << "Texture \"" << texName << "\" \"" << texType << "\" \"imagemap\"\n"
<< texOptions
<< " \"string filename\" \"" << filename << "\" " << mappingString << '\n';
mTextureSet.insert(texName);
}
// Also emit a float version for use with alpha testing...
if ((aiTextureType(tt) == aiTextureType_DIFFUSE ||
aiTextureType(tt) == aiTextureType_BASE_COLOR) &&
TextureHasAlphaMask(filename)) {
texType = "float";
texName = std::string("alpha:") + filename;
if (mTextureSet.find(texName) == mTextureSet.end()) {
mOutput << "Texture \"" << texName << "\" \"" << texType << "\" \"imagemap\"\n"
<< " \"string filename\" \"" << filename << "\" " << mappingString << '\n';
mTextureSet.insert(texName);
}
}
}
}
}
}
bool PbrtExporter::TextureHasAlphaMask(const std::string &filename) {
// TODO: STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp);
// quick return if it's 3
int xSize, ySize, nComponents;
unsigned char *data = stbi_load(filename.c_str(), &xSize, &ySize, &nComponents, 0);
if (!data) {
std::cerr << filename << ": unable to load texture and check for alpha mask in texture. "
"Geometry will not be alpha masked with this texture.\n";
return false;
}
bool hasMask = false;
switch (nComponents) {
case 1:
for (int i = 0; i < xSize * ySize; ++i)
if (data[i] != 255) {
hasMask = true;
break;
}
break;
case 2:
for (int y = 0; y < ySize; ++y)
for (int x = 0; x < xSize; ++x)
if (data[2 * (x + y * xSize) + 1] != 255) {
hasMask = true;
break;
}
break;
case 3:
break;
case 4:
for (int y = 0; y < ySize; ++y)
for (int x = 0; x < xSize; ++x)
if (data[4 * (x + y * xSize) + 3] != 255) {
hasMask = true;
break;
}
break;
default:
std::cerr << filename << ": unexpected number of image channels, " <<
nComponents << ".\n";
}
stbi_image_free(data);
return hasMask;
}
void PbrtExporter::WriteMaterials() {
mOutput << "\n";
mOutput << "####################\n";
mOutput << "# Materials (" << mScene->mNumMaterials << ") total\n\n";
for (unsigned int i = 0; i < mScene->mNumMaterials; i++) {
WriteMaterial(i);
}
mOutput << "\n\n";
}
void PbrtExporter::WriteMaterial(int m) {
aiMaterial* material = mScene->mMaterials[m];
// get material name
auto materialName = material->GetName();
mOutput << std::endl << "# - Material " << m+1 << ": " << materialName.C_Str() << "\n";
// Print out number of properties
mOutput << "# - Number of Material Properties: " << material->mNumProperties << "\n";
// Print out texture type counts
mOutput << "# - Non-Zero Texture Type Counts: ";
for (int i = 1; i <= aiTextureType_UNKNOWN; i++) {
int count = material->GetTextureCount(aiTextureType(i));
if (count > 0)
mOutput << TextureTypeToString(aiTextureType(i)) << ": " << count << " ";
}
mOutput << "\n";
auto White = [](aiColor3D c) { return c.r == 1 && c.g == 1 && c.b == 1; };
auto Black = [](aiColor3D c) { return c.r == 0 && c.g == 0 && c.b == 0; };
aiColor3D diffuse, specular, transparency;
bool constantDiffuse = (material->Get(AI_MATKEY_COLOR_DIFFUSE, diffuse) == AI_SUCCESS &&
!White(diffuse));
bool constantSpecular = (material->Get(AI_MATKEY_COLOR_SPECULAR, specular) == AI_SUCCESS &&
!White(specular));
bool constantTransparency = (material->Get(AI_MATKEY_COLOR_TRANSPARENT, transparency) == AI_SUCCESS &&
!Black(transparency));
float opacity, shininess, shininessStrength, eta;
bool constantOpacity = (material->Get(AI_MATKEY_OPACITY, opacity) == AI_SUCCESS &&
opacity != 0);
bool constantShininess = material->Get(AI_MATKEY_SHININESS, shininess) == AI_SUCCESS;
bool constantShininessStrength = material->Get(AI_MATKEY_SHININESS_STRENGTH, shininessStrength) == AI_SUCCESS;
bool constantEta = (material->Get(AI_MATKEY_REFRACTI, eta) == AI_SUCCESS &&
eta != 1);
mOutput << "# - Constants: diffuse " << constantDiffuse << " specular " << constantSpecular <<
" transprency " << constantTransparency << " opacity " << constantOpacity <<
" shininess " << constantShininess << " shininess strength " << constantShininessStrength <<
" eta " << constantEta << "\n";
aiString roughnessMap;
if (material->Get(AI_MATKEY_TEXTURE_SHININESS(0), roughnessMap) == AI_SUCCESS) {
std::string roughnessTexture = std::string("float:") +
RemoveSuffix(CleanTextureFilename(roughnessMap)) + "_Roughness";
mOutput << "MakeNamedMaterial \"" << materialName.C_Str() << "\""
<< " \"string type\" \"coateddiffuse\"\n"
<< " \"texture roughness\" \"" << roughnessTexture << "\"\n";
} else if (constantShininess) {
// Assume plastic for now at least
float roughness = std::max(0.f, 1.f - shininess);
mOutput << "MakeNamedMaterial \"" << materialName.C_Str() << "\""
<< " \"string type\" \"coateddiffuse\"\n"
<< " \"float roughness\" " << roughness << "\n";
} else
// Diffuse
mOutput << "MakeNamedMaterial \"" << materialName.C_Str() << "\""
<< " \"string type\" \"diffuse\"\n";
aiString diffuseTexture;
if (material->Get(AI_MATKEY_TEXTURE_DIFFUSE(0), diffuseTexture) == AI_SUCCESS)
mOutput << " \"texture reflectance\" \"rgb:" << RemoveSuffix(CleanTextureFilename(diffuseTexture)) << "\"\n";
else
mOutput << " \"rgb reflectance\" [ " << diffuse.r << " " << diffuse.g <<
" " << diffuse.b << " ]\n";
aiString displacementTexture, normalMap;
if (material->Get(AI_MATKEY_TEXTURE_NORMALS(0), displacementTexture) == AI_SUCCESS)
mOutput << " \"string normalmap\" \"" << CleanTextureFilename(displacementTexture) << "\"\n";
else if (material->Get(AI_MATKEY_TEXTURE_HEIGHT(0), displacementTexture) == AI_SUCCESS)
mOutput << " \"texture displacement\" \"float:" <<
RemoveSuffix(CleanTextureFilename(displacementTexture)) << "\"\n";
else if (material->Get(AI_MATKEY_TEXTURE_DISPLACEMENT(0), displacementTexture) == AI_SUCCESS)
mOutput << " \"texture displacement\" \"float:" <<
RemoveSuffix(CleanTextureFilename(displacementTexture)) << "\"\n";
}
std::string PbrtExporter::CleanTextureFilename(const aiString &f, bool rewriteExtension) const {
std::string fn = f.C_Str();
// Remove directory name
size_t offset = fn.find_last_of("/\\");
if (offset != std::string::npos) {
fn.erase(0, offset + 1);
}
// Expect all textures in textures
fn = std::string("textures") + mIOSystem->getOsSeparator() + fn;
// Rewrite extension for unsupported file formats.
if (rewriteExtension) {
offset = fn.rfind('.');
if (offset != std::string::npos) {
std::string extension = fn;
extension.erase(0, offset + 1);
std::transform(extension.begin(), extension.end(), extension.begin(),
[](unsigned char c) { return (char)std::tolower(c); });
if (extension != "tga" && extension != "exr" && extension != "png" &&
extension != "pfm" && extension != "hdr") {
std::string orig = fn;
fn.erase(offset + 1);
fn += "png";
// Does it already exist? Warn if not.
std::ifstream filestream(fn);
if (!filestream.good())
std::cerr << orig << ": must convert this texture to PNG.\n";
}
}
}
return fn;
}
std::string PbrtExporter::RemoveSuffix(std::string filename) {
size_t offset = filename.rfind('.');
if (offset != std::string::npos)
filename.erase(offset);
return filename;
}
void PbrtExporter::WriteLights() {
mOutput << "\n";
mOutput << "#################\n";
mOutput << "# Lights\n\n";
if (mScene->mNumLights == 0) {
// Skip the default light if no cameras and this is flat up geometry
if (mScene->mNumCameras > 0) {
std::cerr << "No lights specified. Using default infinite light.\n";
mOutput << "AttributeBegin\n";
mOutput << " # default light\n";
mOutput << " LightSource \"infinite\" \"blackbody L\" [6000 1]\n";
mOutput << "AttributeEnd\n\n";
}
} else {
for (unsigned int i = 0; i < mScene->mNumLights; ++i) {
const aiLight *light = mScene->mLights[i];
mOutput << "# Light " << light->mName.C_Str() << "\n";
mOutput << "AttributeBegin\n";
aiMatrix4x4 worldFromLight = GetNodeTransform(light->mName);
mOutput << " Transform [ " << TransformAsString(worldFromLight) << " ]\n";
aiColor3D color = light->mColorDiffuse + light->mColorSpecular;
if (light->mAttenuationConstant != 0)
color = color * (ai_real)(1. / light->mAttenuationConstant);
switch (light->mType) {
case aiLightSource_DIRECTIONAL: {
mOutput << " LightSource \"distant\"\n";
mOutput << " \"point3 from\" [ " << light->mPosition.x << " " <<
light->mPosition.y << " " << light->mPosition.z << " ]\n";
aiVector3D to = light->mPosition + light->mDirection;
mOutput << " \"point3 to\" [ " << to.x << " " << to.y << " " << to.z << " ]\n";
mOutput << " \"rgb L\" [ " << color.r << " " << color.g << " " << color.b << " ]\n";
break;
} case aiLightSource_POINT:
mOutput << " LightSource \"distant\"\n";
mOutput << " \"point3 from\" [ " << light->mPosition.x << " " <<
light->mPosition.y << " " << light->mPosition.z << " ]\n";
mOutput << " \"rgb L\" [ " << color.r << " " << color.g << " " << color.b << " ]\n";
break;
case aiLightSource_SPOT: {
mOutput << " LightSource \"spot\"\n";
mOutput << " \"point3 from\" [ " << light->mPosition.x << " " <<
light->mPosition.y << " " << light->mPosition.z << " ]\n";
aiVector3D to = light->mPosition + light->mDirection;
mOutput << " \"point3 to\" [ " << to.x << " " << to.y << " " << to.z << " ]\n";
mOutput << " \"rgb L\" [ " << color.r << " " << color.g << " " << color.b << " ]\n";
mOutput << " \"float coneangle\" [ " << AI_RAD_TO_DEG(light->mAngleOuterCone) << " ]\n";
mOutput << " \"float conedeltaangle\" [ " << AI_RAD_TO_DEG(light->mAngleOuterCone -
light->mAngleInnerCone) << " ]\n";
break;
} case aiLightSource_AMBIENT:
mOutput << "# ignored ambient light source\n";
break;
case aiLightSource_AREA: {
aiVector3D left = light->mDirection ^ light->mUp;
// rectangle. center at position, direction is normal vector
float dLeft = light->mSize.x / 2, dUp = light->mSize.y / 2;
aiVector3D vertices[4] = {
light->mPosition - dLeft * left - dUp * light->mUp,
light->mPosition + dLeft * left - dUp * light->mUp,
light->mPosition - dLeft * left + dUp * light->mUp,
light->mPosition + dLeft * left + dUp * light->mUp };
mOutput << " AreaLightSource \"diffuse\"\n";
mOutput << " \"rgb L\" [ " << color.r << " " << color.g << " " << color.b << " ]\n";
mOutput << " Shape \"bilinearmesh\"\n";
mOutput << " \"point3 p\" [ ";
for (int j = 0; j < 4; ++j)
mOutput << vertices[j].x << " " << vertices[j].y << " " << vertices[j].z;
mOutput << " ]\n";
mOutput << " \"integer indices\" [ 0 1 2 3 ]\n";
break;
} default:
mOutput << "# ignored undefined light source type\n";
break;
}
mOutput << "AttributeEnd\n\n";
}
}
}
void PbrtExporter::WriteMesh(aiMesh* mesh) {
mOutput << "# - Mesh: ";
if (mesh->mName == aiString(""))
mOutput << "<No Name>\n";
else
mOutput << mesh->mName.C_Str() << "\n";
mOutput << "AttributeBegin\n";
aiMaterial* material = mScene->mMaterials[mesh->mMaterialIndex];
mOutput << " NamedMaterial \"" << material->GetName().C_Str() << "\"\n";
// Handle area lights
aiColor3D emission;
if (material->Get(AI_MATKEY_COLOR_EMISSIVE, emission) == AI_SUCCESS &&
(emission.r > 0 || emission.g > 0 || emission.b > 0))
mOutput << " AreaLightSource \"diffuse\" \"rgb L\" [ " << emission.r <<
" " << emission.g << " " << emission.b << " ]\n";
// Check if any types other than tri
if ( (mesh->mPrimitiveTypes & aiPrimitiveType_POINT)
|| (mesh->mPrimitiveTypes & aiPrimitiveType_LINE)
|| (mesh->mPrimitiveTypes & aiPrimitiveType_POLYGON)) {
std::cerr << "Error: ignoring point / line / polygon mesh " << mesh->mName.C_Str() << ".\n";
return;
}
// Alpha mask
std::string alpha;
aiString opacityTexture;
if (material->Get(AI_MATKEY_TEXTURE_OPACITY(0), opacityTexture) == AI_SUCCESS ||
material->Get(AI_MATKEY_TEXTURE_DIFFUSE(0), opacityTexture) == AI_SUCCESS) {
// material->Get(AI_MATKEY_TEXTURE_BASE_COLOR(0), opacityTexture) == AI_SUCCESS)
std::string texName = std::string("alpha:") + CleanTextureFilename(opacityTexture);
if (mTextureSet.find(texName) != mTextureSet.end())
alpha = std::string(" \"texture alpha\" \"") + texName + "\"\n";
} else {
float opacity = 1;
if (material->Get(AI_MATKEY_OPACITY, opacity) == AI_SUCCESS && opacity < 1)
alpha = std::string(" \"float alpha\" [ ") + std::to_string(opacity) + " ]\n";
}
// Output the shape specification
mOutput << "Shape \"trianglemesh\"\n" <<
alpha <<
" \"integer indices\" [";
// Start with faces (which hold indices)
for (unsigned int i = 0; i < mesh->mNumFaces; i++) {
auto face = mesh->mFaces[i];
if (face.mNumIndices != 3) throw DeadlyExportError("oh no not a tri!");
for (unsigned int j = 0; j < face.mNumIndices; j++) {
mOutput << face.mIndices[j] << " ";
}
if ((i % 7) == 6) mOutput << "\n ";
}
mOutput << "]\n";
// Then go to vertices
mOutput << " \"point3 P\" [";
for (unsigned int i = 0; i < mesh->mNumVertices; i++) {
auto vector = mesh->mVertices[i];
mOutput << vector.x << " " << vector.y << " " << vector.z << " ";
if ((i % 4) == 3) mOutput << "\n ";
}
mOutput << "]\n";
// Normals (if present)
if (mesh->mNormals) {
mOutput << " \"normal N\" [";
for (unsigned int i = 0; i < mesh->mNumVertices; i++) {
auto normal = mesh->mNormals[i];
mOutput << normal.x << " " << normal.y << " " << normal.z << " ";
if ((i % 4) == 3) mOutput << "\n ";
}
mOutput << "]\n";
}
// Tangents (if present)
if (mesh->mTangents) {
mOutput << " \"vector3 S\" [";
for (unsigned int i = 0; i < mesh->mNumVertices; i++) {
auto tangent = mesh->mTangents[i];
mOutput << tangent.x << " " << tangent.y << " " << tangent.z << " ";
if ((i % 4) == 3) mOutput << "\n ";
}
mOutput << "]\n";
}
// Texture Coords (if present)
// Find the first set of 2D texture coordinates..
for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
if (mesh->mNumUVComponents[i] == 2) {
// assert(mesh->mTextureCoords[i] != nullptr);
aiVector3D* uv = mesh->mTextureCoords[i];
mOutput << " \"point2 uv\" [";
for (unsigned int j = 0; j < mesh->mNumVertices; ++j) {
mOutput << uv[j].x << " " << uv[j].y << " ";
if ((j % 6) == 5) mOutput << "\n ";
}
mOutput << "]\n";
break;
}
}
// TODO: issue warning if there are additional UV sets?
mOutput << "AttributeEnd\n";
}
void PbrtExporter::WriteInstanceDefinition(int i) {
aiMesh* mesh = mScene->mMeshes[i];
mOutput << "ObjectBegin \"";
if (mesh->mName == aiString(""))
mOutput << "mesh_" << i+1 << "\"\n";
else
mOutput << mesh->mName.C_Str() << "_" << i+1 << "\"\n";
WriteMesh(mesh);
mOutput << "ObjectEnd\n";
}
void PbrtExporter::WriteGeometricObjects(aiNode* node, aiMatrix4x4 worldFromObject,
std::map<int, int> &meshUses) {
// Sometimes interior nodes have degenerate matrices??
if (node->mTransformation.Determinant() != 0)
worldFromObject = worldFromObject * node->mTransformation;
if (node->mNumMeshes > 0) {
mOutput << "AttributeBegin\n";
mOutput << " Transform [ " << TransformAsString(worldFromObject) << "]\n";
for (unsigned int i = 0; i < node->mNumMeshes; i++) {
aiMesh* mesh = mScene->mMeshes[node->mMeshes[i]];
if (meshUses[node->mMeshes[i]] == 1) {
// If it's only used once in the scene, emit it directly as
// a triangle mesh.
mOutput << " # " << mesh->mName.C_Str();
WriteMesh(mesh);
} else {
// If it's used multiple times, there will be an object
// instance for it, so emit a reference to that.
mOutput << " ObjectInstance \"";
if (mesh->mName == aiString(""))
mOutput << "mesh_" << node->mMeshes[i] + 1 << "\"\n";
else
mOutput << mesh->mName.C_Str() << "_" << node->mMeshes[i] + 1 << "\"\n";
}
}
mOutput << "AttributeEnd\n\n";
}
// Recurse through children
for (unsigned int i = 0; i < node->mNumChildren; i++) {
WriteGeometricObjects(node->mChildren[i], worldFromObject, meshUses);
}
}
#endif // ASSIMP_BUILD_NO_PBRT_EXPORTER
#endif // ASSIMP_BUILD_NO_EXPORT

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/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
Copyright (c) 2006-2020, 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.
----------------------------------------------------------------------
*/
/** @file PbrtExporter.h
* Declares the exporter class to write a scene to a pbrt file
*/
#ifndef AI_PBRTEXPORTER_H_INC
#define AI_PBRTEXPORTER_H_INC
#ifndef ASSIMP_BUILD_NO_PBRT_EXPORTER
#include <assimp/types.h>
#include <assimp/StreamWriter.h>
#include <assimp/Exceptional.h>
#include <map>
#include <set>
#include <string>
#include <sstream>
struct aiScene;
struct aiNode;
struct aiMaterial;
struct aiMesh;
namespace Assimp {
class IOSystem;
class IOStream;
class ExportProperties;
// ---------------------------------------------------------------------
/** Helper class to export a given scene to a Pbrt file. */
// ---------------------------------------------------------------------
class PbrtExporter
{
public:
/// Constructor for a specific scene to export
PbrtExporter(const aiScene* pScene, IOSystem* pIOSystem,
const std::string path, const std::string file);
/// Destructor
virtual ~PbrtExporter();
private:
// the scene to export
const aiScene* mScene;
/// Stringstream to write all output into
std::stringstream mOutput;
/// The IOSystem for output
IOSystem* mIOSystem;
/// Path of the directory where the scene will be exported
const std::string mPath;
/// Name of the file (without extension) where the scene will be exported
const std::string mFile;
private:
// A private set to keep track of which textures have been declared
std::set<std::string> mTextureSet;
aiMatrix4x4 GetNodeTransform(const aiString& name) const;
static std::string TransformAsString(const aiMatrix4x4& m);
static std::string RemoveSuffix(std::string filename);
std::string CleanTextureFilename(const aiString &f, bool rewriteExtension = true) const;
void WriteMetaData();
void WriteWorldDefinition();
void WriteCameras();
void WriteCamera(int i);
void WriteLights();
void WriteTextures();
static bool TextureHasAlphaMask(const std::string &filename);
void WriteMaterials();
void WriteMaterial(int i);
void WriteMesh(aiMesh* mesh);
void WriteInstanceDefinition(int i);
void WriteGeometricObjects(aiNode* node, aiMatrix4x4 parentTransform,
std::map<int, int> &meshUses);
};
} // namespace Assimp
#endif // ASSIMP_BUILD_NO_PBRT_EXPORTER
#endif // AI_PBRTEXPORTER_H_INC

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