//-------------------------------------------
bool ofxAssimpModelLoader::loadModel(ofBuffer & buffer, bool optimize, const char * extension){
normalizeFactor = ofGetWidth() / 2.0;
// only ever give us triangles.
aiSetImportPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT );
aiSetImportPropertyInteger(AI_CONFIG_PP_PTV_NORMALIZE, true);
// aiProcess_FlipUVs is for VAR code. Not needed otherwise. Not sure why.
unsigned int flags = aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_Triangulate | aiProcess_FlipUVs;
if(optimize) flags |= aiProcess_ImproveCacheLocality | aiProcess_OptimizeGraph |
aiProcess_OptimizeMeshes | aiProcess_JoinIdenticalVertices |
aiProcess_RemoveRedundantMaterials;
if(scene){
clear();
}
scene = aiImportFileFromMemory(buffer.getBinaryBuffer(), buffer.size(), flags, extension);
if(scene){
calculateDimensions();
loadGLResources();
if(getAnimationCount())
ofLog(OF_LOG_VERBOSE, "scene has animations");
else {
ofLog(OF_LOG_VERBOSE, "no animations");
}
return true;
}else{
ofLog(OF_LOG_ERROR,string("ofxAssimpModelLoader: ") + aiGetErrorString());
return false;
}
}
int main(int argc, const char **argv)
{
if(argc == 1)
{
const char *params[] = {"-p", "win32", "../../../Raw/Level/level.dae", "./"};
parseArgs(4, params);
}
else
parseArgs(argc, argv);
printf("Outputting in %s format\n",
g_Endianness == LittleEndian ? "LittleEndian" : "BigEndian");
aiSetImportPropertyInteger(
AI_CONFIG_PP_RVC_FLAGS,
aiComponent_TANGENTS_AND_BITANGENTS |
aiComponent_COLORS
);
// Remove degenerates; if we don't do this, tangents & bitangents
// can't be calculated for meshes with degenerate tris
aiSetImportPropertyInteger(
AI_CONFIG_PP_FD_REMOVE,
true
);
const aiScene* scene = aiImportFile(
filename.c_str(),
aiProcessPreset_TargetRealtime_MaxQuality |
aiProcess_GenNormals |
aiProcess_RemoveComponent
);
if(!scene)
printf("Failed to load %s\n", filename.c_str());
else
{
makeDirectories();
cJSON *root = cJSON_CreateObject();
cJSON *list = cJSON_CreateArray();
cJSON_AddItemToObject(root, "scene", list);
aiMatrix4x4 identity;
printf("Loaded %s\n", filename.c_str());
processSceneRecursive(scene, list, identity, scene->mRootNode);
printf("Done\n");
outputFinalStep();
writeJsonToFile(root, outdir + "/scene.scene");
}
aiReleaseImport(scene);
getchar();
return 0;
}
//------------------------------------------
void ofxAssimpModelLoader::loadModel(string modelName){
// if we have a model loaded, unload the f****r.
if(scene != NULL)
{
aiReleaseImport(scene);
scene = NULL;
deleteGLResources();
}
// Load our new path.
string filepath = ofToDataPath(modelName);
ofLog(OF_LOG_VERBOSE, "loading model %s", filepath.c_str());
// only ever give us triangles.
aiSetImportPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT );
aiSetImportPropertyInteger(AI_CONFIG_PP_PTV_NORMALIZE, true);
// aiProcess_FlipUVs is for VAR code. Not needed otherwise. Not sure why.
scene = (aiScene*) aiImportFile(filepath.c_str(), aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_OptimizeGraph | aiProcess_Triangulate | aiProcess_FlipUVs | 0 );
if(scene){
ofLog(OF_LOG_VERBOSE, "initted scene with %i meshes & %i animations", scene->mNumMeshes, scene->mNumAnimations);
getBoundingBoxWithMinVector(&scene_min, &scene_max);
scene_center.x = (scene_min.x + scene_max.x) / 2.0f;
scene_center.y = (scene_min.y + scene_max.y) / 2.0f;
scene_center.z = (scene_min.z + scene_max.z) / 2.0f;
// optional normalized scaling
normalizedScale = scene_max.x-scene_min.x;
normalizedScale = aisgl_max(scene_max.y - scene_min.y,normalizedScale);
normalizedScale = aisgl_max(scene_max.z - scene_min.z,normalizedScale);
normalizedScale = 1.f / normalizedScale;
normalizedScale *= ofGetWidth() / 2.0;
glPushAttrib(GL_ALL_ATTRIB_BITS);
glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
loadGLResources();
glPopClientAttrib();
glPopAttrib();
if(getAnimationCount())
ofLog(OF_LOG_VERBOSE, "scene has animations");
else {
ofLog(OF_LOG_VERBOSE, "no animations");
}
}
}
//------------------------------------------
bool ofxAssimpModelLoader::loadModel(string modelName, unsigned extraFlags /* = 0 */){
// if we have a model loaded, unload the f****r.
if(scene != NULL){
clear();
}
// Load our new path.
filepath = modelName;
string filepath = ofToDataPath(modelName);
//theo added - so we can have models and their textures in sub folders
modelFolder = ofFilePath::getEnclosingDirectory(filepath);
ofLog(OF_LOG_VERBOSE, "loading model %s", filepath.c_str());
ofLog(OF_LOG_VERBOSE, "loading from folder %s", modelFolder.c_str());
// only ever give us triangles.
aiSetImportPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT );
aiSetImportPropertyInteger(AI_CONFIG_PP_PTV_NORMALIZE, true);
// aiProcess_FlipUVs is for VAR code. Not needed otherwise. Not sure why.
unsigned int flags = aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_Triangulate | aiProcess_FlipUVs;
flags |= extraFlags;
/*
if(optimize) flags |= aiProcess_ImproveCacheLocality | aiProcess_OptimizeGraph |
aiProcess_OptimizeMeshes | aiProcess_JoinIdenticalVertices |
aiProcess_RemoveRedundantMaterials;
*/
scene = aiImportFile(filepath.c_str(), flags);
if(scene){
calculateDimensions();
loadGLResources();
if(getAnimationCount())
ofLog(OF_LOG_VERBOSE, "scene has animations");
else {
ofLog(OF_LOG_VERBOSE, "no animations");
}
collectNodeTransforms(scene, scene->mRootNode);
collectBoneTransforms();
return true;
}else{
ofLog(OF_LOG_ERROR,string("ofxAssimpModelLoader: ") + aiGetErrorString());
return false;
}
}
unsigned int ofxAssimpModelLoader::initImportProperties(bool optimize) {
store.reset(aiCreatePropertyStore(), aiReleasePropertyStore);
// only ever give us triangles.
aiSetImportPropertyInteger(store.get(), AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT );
aiSetImportPropertyInteger(store.get(), AI_CONFIG_PP_PTV_NORMALIZE, true);
// aiProcess_FlipUVs is for VAR code. Not needed otherwise. Not sure why.
unsigned int flags = aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_Triangulate | aiProcess_FlipUVs;
if(optimize) flags |= aiProcess_ImproveCacheLocality | aiProcess_OptimizeGraph |
aiProcess_OptimizeMeshes | aiProcess_JoinIdenticalVertices |
aiProcess_RemoveRedundantMaterials;
return flags;
}
const aiScene* MeshShape::loadMesh(const std::string& _fileName) {
aiPropertyStore* propertyStore = aiCreatePropertyStore();
// remove points and lines
aiSetImportPropertyInteger(propertyStore,
AI_CONFIG_PP_SBP_REMOVE,
aiPrimitiveType_POINT | aiPrimitiveType_LINE);
const aiScene* scene =
aiImportFileExWithProperties(_fileName.c_str(),
aiProcess_GenNormals |
aiProcess_Triangulate |
aiProcess_JoinIdenticalVertices |
aiProcess_SortByPType |
aiProcess_OptimizeMeshes,
NULL, propertyStore);
aiReleasePropertyStore(propertyStore);
// Assimp rotates collada files such that the up-axis (specified in the
// collada file) aligns with assimp's y-axis. Here we are reverting this
// rotation. We are only catching files with the .dae file ending here. We
// might miss files with an .xml file ending, which would need to be looked
// into to figure out whether they are collada files.
if (_fileName.length() >= 4
&& _fileName.substr(_fileName.length() - 4, 4) == ".dae") {
scene->mRootNode->mTransformation = aiMatrix4x4();
}
scene = aiApplyPostProcessing(scene, aiProcess_PreTransformVertices);
return scene;
}
//-------------------------------------------
bool ofxAssimpModelLoader::loadModel(ofBuffer & buffer, bool optimize, const char * extension){
normalizeFactor = ofGetWidth() / 2.0;
if(scene != NULL){
clear();
}
// only ever give us triangles.
aiSetImportPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT );
aiSetImportPropertyInteger(AI_CONFIG_PP_PTV_NORMALIZE, true);
// aiProcess_FlipUVs is for VAR code. Not needed otherwise. Not sure why.
unsigned int flags = aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_Triangulate | aiProcess_FlipUVs;
if(optimize) flags |= aiProcess_ImproveCacheLocality | aiProcess_OptimizeGraph |
aiProcess_OptimizeMeshes | aiProcess_JoinIdenticalVertices |
aiProcess_RemoveRedundantMaterials;
scene = aiImportFileFromMemory(buffer.getBinaryBuffer(), buffer.size(), flags, extension);
if(scene){
calculateDimensions();
loadGLResources();
update();
if(getAnimationCount())
ofLogVerbose("ofxAssimpModelLoader") << "loadModel(): scene has " << getAnimationCount() << "animations";
else {
ofLogVerbose("ofxAssimpModelLoader") << "loadMode(): no animations";
}
ofAddListener(ofEvents().exit,this,&ofxAssimpModelLoader::onAppExit);
return true;
}else{
ofLogError("ofxAssimpModelLoader") << "loadModel(): " + (string) aiGetErrorString();
clear();
return false;
}
}
const aiScene* ShapeMesh::loadMesh(const string& fileName) {
aiPropertyStore* propertyStore = aiCreatePropertyStore();
aiSetImportPropertyInteger(propertyStore, AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_POINT | aiPrimitiveType_LINE ); // remove points and lines
const aiScene* scene = aiImportFileExWithProperties(fileName.c_str(), aiProcess_GenNormals |
aiProcess_Triangulate |
aiProcess_JoinIdenticalVertices |
aiProcess_SortByPType |
aiProcess_PreTransformVertices |
aiProcess_OptimizeMeshes,
NULL, propertyStore);
aiReleasePropertyStore(propertyStore);
return scene;
}
void NCAssimpModel::setup(string pathtomodel){
string filepath = ofToDataPath(pathtomodel);
bool optimize =false;
// only ever give us triangles.
aiSetImportPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE | aiPrimitiveType_POINT );
aiSetImportPropertyInteger(AI_CONFIG_PP_PTV_NORMALIZE, true);
// aiProcess_FlipUVs is for VAR code. Not needed otherwise. Not sure why.
unsigned int flags = aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_OptimizeGraph | aiProcess_Triangulate | aiProcess_FlipUVs | aiProcess_CalcTangentSpace | aiProcess_JoinIdenticalVertices | aiProcess_SortByPType;
if(optimize) flags |= aiProcess_ImproveCacheLocality | aiProcess_OptimizeGraph |
aiProcess_OptimizeMeshes | aiProcess_JoinIdenticalVertices |
aiProcess_RemoveRedundantMaterials;
if (scene) {
for(int i = 0; i < 100; i++) {
jointlabels[i] = "";
}
bones.clear();
delete scene;
}
scene = aiImportFile(filepath.c_str(), flags);
if(scene){
meshes.clear();
initBones();
for (int i=0;i<scene->mNumMeshes;i++) {
NCAIMesh mesh;
mesh.setup(scene->mMeshes[i], scene);
meshes.push_back(mesh);
}
}
}
bool opMeshBaker::LoadAndBake(const char* input_filename, const char* output_filename) {
aiSetImportPropertyFloat("AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE", 80.0f);
aiSetImportPropertyInteger("AI_CONFIG_PP_RVC_FLAGS", aiComponent_NORMALS); // throw away normals (generate them)
/* generate a mesh from the input file:
Calculate tangents and bitangents
Triangulate
Weld vertices together
Sort by primitive type
Generate smooth normals
Fix infacing normals
Generate UV coords
optimize the mesh
*/
const aiScene* scene = aiImportFile(input_filename,
aiProcess_CalcTangentSpace |
aiProcess_Triangulate |
aiProcess_JoinIdenticalVertices |
aiProcess_SortByPType |
aiProcess_GenSmoothNormals |
aiProcess_FixInfacingNormals |
aiProcess_GenUVCoords |
aiProcess_ConvertToLeftHanded |
aiProcess_OptimizeMeshes);
if(scene == NULL) {
palPrintf("Could not open understand input file: %s\n", input_filename);
return false;
}
palPrintf("Baking %s to %s\n", input_filename, output_filename);
// we only support 1:1 mapping between input file meshes and output file meshes
palAssert(scene->mNumMeshes == 1);
aiMesh* mesh = scene->mMeshes[0];
// we expect faces
palAssert(mesh->HasFaces() == true);
// we expect vertex positions
palAssert(mesh->HasPositions() == true);
//printf("Has vertex positions.\n");
// we expect normals
palAssert(mesh->HasNormals() == true);
//printf("Has vertex normal.\n");
// we only support triangular meshes
palAssert(mesh->mPrimitiveTypes == aiPrimitiveType_TRIANGLE);
palFile baked;
int r;
r = baked.OpenForWritingTruncate(output_filename);
if (r != 0) {
palPrintf("Could not open output file: %s\n", output_filename);
return false;
}
palArray<opBakedMeshArrayHeader> mesh_arrays;
mesh_arrays.SetAllocator(g_DefaultHeapAllocator);
palArray<void*> mesh_arrays_data;
mesh_arrays_data.SetAllocator(g_DefaultHeapAllocator);
palArray<opBakedMeshAttributeHeader> mesh_attributes;
mesh_attributes.SetAllocator(g_DefaultHeapAllocator);
opBakedMeshArrayHeader mesh_array;
// index array
mesh_array.array_type = OP_BAKED_MESH_INDEX_ARRAY;
// pack index data tightly
uint32_t num_indices = mesh->mNumFaces * 3;
void* index_array_data = NULL;
if (num_indices < 0xffff) {
mesh_array.index_type = kOpRenderDeviceFormatUintR16;
mesh_array.length_in_bytes = num_indices * sizeof(uint16_t);
uint16_t* indices = (uint16_t*)g_DefaultHeapAllocator->Allocate(mesh_array.length_in_bytes);
palAssert(indices);
index_array_data = indices;
for (unsigned int i = 0; i < mesh->mNumFaces; i++) {
*indices = mesh->mFaces[i].mIndices[0];
indices++;
*indices = mesh->mFaces[i].mIndices[1];
indices++;
*indices = mesh->mFaces[i].mIndices[2];
indices++;
}
} else {
mesh_array.index_type = kOpRenderDeviceFormatUintR32;
mesh_array.length_in_bytes = num_indices * sizeof(uint32_t);
uint32_t* indices = (uint32_t*)g_DefaultHeapAllocator->Allocate(mesh_array.length_in_bytes);
palAssert(indices);
index_array_data = indices;
for (unsigned int i = 0; i < mesh->mNumFaces; i++) {
*indices = mesh->mFaces[i].mIndices[0];
indices++;
*indices = mesh->mFaces[i].mIndices[1];
indices++;
*indices = mesh->mFaces[i].mIndices[2];
indices++;
}
}
printf("Indexed triangle mesh: %d triangles (%d bytes in index data)\n", num_indices/3, mesh_array.length_in_bytes);
mesh_arrays_data.push_back(index_array_data);
mesh_arrays.push_back(mesh_array);
// pack into single interleaved array
{
uint32_t offset = 0;
opBakedMeshAttributeHeader mesh_component;
// position
mesh_component.attribute_type = OP_BAKED_MESH_ATTRIBUTE_VERTICES;
mesh_component.element_type = kOpRenderDeviceFormatFloat32x3;
mesh_component.offset_in_bytes = 0;
mesh_component.array_index = 1;
mesh_attributes.push_back(mesh_component);
offset += 3 * sizeof(float);
// normals
mesh_component.attribute_type = OP_BAKED_MESH_ATTRIBUTE_NORMALS;
mesh_component.element_type = kOpRenderDeviceFormatFloat32x3;
mesh_component.offset_in_bytes = offset;
mesh_component.array_index = 1;
mesh_attributes.push_back(mesh_component);
offset += 3 * sizeof(float);
if (mesh->HasTangentsAndBitangents()) {
// tangents
mesh_component.attribute_type = OP_BAKED_MESH_ATTRIBUTE_TANGENTS;
mesh_component.element_type = kOpRenderDeviceFormatFloat32x3;
mesh_component.offset_in_bytes = offset;
mesh_component.array_index = 1;
mesh_attributes.push_back(mesh_component);
offset += 3 * sizeof(float);
// bitangents
mesh_component.attribute_type = OP_BAKED_MESH_ATTRIBUTE_BITANGENTS;
mesh_component.element_type = kOpRenderDeviceFormatFloat32x3;
mesh_component.offset_in_bytes = offset;
mesh_component.array_index = 1;
mesh_attributes.push_back(mesh_component);
offset += 3 * sizeof(float);
printf("Has vertex tangents and bitangents.\n");
}
// texture coordinates 0..3
for (unsigned int i = 0; i < mesh->GetNumUVChannels(); i++) {
mesh_component.attribute_type = (opBakedMeshAttributeType)(OP_BAKED_MESH_ATTRIBUTE_TEXCOORDS0 + i);
mesh_component.element_type = TextureElementType(mesh->mNumUVComponents[i]);
mesh_component.offset_in_bytes = offset;
mesh_component.array_index = 1;
printf("Has UV channel %d (%d)\n", i, mesh->mNumUVComponents[i]);
mesh_attributes.push_back(mesh_component);
offset += mesh->mNumUVComponents[i] * sizeof(float);
}
// fill in the stride between vertices
for (int i = 0; i < mesh_attributes.GetSize(); i++) {
mesh_attributes[i].stride_in_bytes = offset;
}
mesh_array.array_type = OP_BAKED_MESH_VERTEX_ARRAY;
mesh_array.length_in_bytes = mesh->mNumVertices * offset;
printf("%d vertices (%d bytes in vertex data)\n", mesh->mNumVertices, mesh_array.length_in_bytes);
void* vertex_array_data = g_DefaultHeapAllocator->Allocate(mesh_array.length_in_bytes);
float* vertex_array_data_f = (float*)vertex_array_data;
for (unsigned int i = 0; i < mesh->mNumVertices; i++) {
// positions
*vertex_array_data_f = mesh->mVertices[i].x;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mVertices[i].y;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mVertices[i].z;
vertex_array_data_f++;
// normals
*vertex_array_data_f = mesh->mNormals[i].x;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mNormals[i].y;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mNormals[i].z;
vertex_array_data_f++;
if (mesh->HasTangentsAndBitangents()) {
// tangents
*vertex_array_data_f = mesh->mTangents[i].x;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mTangents[i].y;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mTangents[i].z;
vertex_array_data_f++;
// bitangents
*vertex_array_data_f = mesh->mBitangents[i].x;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mBitangents[i].y;
vertex_array_data_f++;
*vertex_array_data_f = mesh->mBitangents[i].z;
vertex_array_data_f++;
}
// texture channels
for (unsigned int tc = 0; tc < mesh->GetNumUVChannels(); tc++) {
// texture coordinates
for (unsigned int st = 0; st < mesh->mNumUVComponents[tc]; st++) {
//printf("tex[%d] = %f\n", st, mesh->mTextureCoords[tc][i][st]);
*vertex_array_data_f = mesh->mTextureCoords[tc][i][st];
vertex_array_data_f++;
}
}
}
// push data back into arrays
mesh_arrays_data.push_back(vertex_array_data);
mesh_arrays.push_back(mesh_array);
}
// write data to disk
opBakedMeshHeader header;
header.magic = OP_BAKED_MESH_FILE_MAGIC;
header.attribute_count = mesh_attributes.GetSize();
header.attribute_offset = sizeof(header);
header.array_count = mesh_arrays.GetSize();
header.array_offset = sizeof(header) + sizeof(opBakedMeshAttributeHeader) * mesh_attributes.GetSize();
baked.Write(&header, sizeof(header));
for (int i = 0; i < mesh_attributes.GetSize();i++) {
opBakedMeshAttributeHeader& component_attribute = mesh_attributes[i];
baked.Write(&component_attribute, sizeof(component_attribute));
}
uint32_t array_offset = sizeof(header);
array_offset += sizeof(opBakedMeshAttributeHeader) * mesh_attributes.GetSize();
array_offset += sizeof(opBakedMeshArrayHeader) * mesh_arrays.GetSize();
for (int i = 0; i < mesh_arrays.GetSize(); i++) {
opBakedMeshArrayHeader& array_header = mesh_arrays[i];
array_header.offset_in_bytes = array_offset;
baked.Write(&array_header, sizeof(array_header));
array_offset += array_header.length_in_bytes;
}
for (int i = 0; i < mesh_arrays.GetSize(); i++) {
baked.Write(mesh_arrays_data[i], mesh_arrays[i].length_in_bytes);
g_DefaultHeapAllocator->Deallocate(mesh_arrays_data[i]);
}
baked.Close();
aiReleaseImport(scene);
return true;
}
const aiScene* MeshShape::loadMesh(
const std::string& _uri, const common::ResourceRetrieverPtr& _retriever)
{
// Remove points and lines from the import.
aiPropertyStore* propertyStore = aiCreatePropertyStore();
aiSetImportPropertyInteger(propertyStore,
AI_CONFIG_PP_SBP_REMOVE,
aiPrimitiveType_POINT
| aiPrimitiveType_LINE
);
// Wrap ResourceRetriever in an IOSystem from Assimp's C++ API. Then wrap
// the IOSystem in an aiFileIO from Assimp's C API. Yes, this API is
// completely ridiculous...
AssimpInputResourceRetrieverAdaptor systemIO(_retriever);
aiFileIO fileIO = createFileIO(&systemIO);
// Import the file.
const aiScene* scene = aiImportFileExWithProperties(
_uri.c_str(),
aiProcess_GenNormals
| aiProcess_Triangulate
| aiProcess_JoinIdenticalVertices
| aiProcess_SortByPType
| aiProcess_OptimizeMeshes,
&fileIO,
propertyStore
);
// If succeeded, store the importer in the scene to keep it alive. This is
// necessary because the importer owns the memory that it allocates.
if(!scene)
{
dtwarn << "[MeshShape::loadMesh] Failed loading mesh '" << _uri << "'.\n";
return nullptr;
}
// Assimp rotates collada files such that the up-axis (specified in the
// collada file) aligns with assimp's y-axis. Here we are reverting this
// rotation. We are only catching files with the .dae file ending here. We
// might miss files with an .xml file ending, which would need to be looked
// into to figure out whether they are collada files.
std::string extension;
const size_t extensionIndex = _uri.find_last_of('.');
if(extensionIndex != std::string::npos)
extension = _uri.substr(extensionIndex);
std::transform(std::begin(extension), std::end(extension),
std::begin(extension), ::tolower);
if(extension == ".dae" || extension == ".zae")
scene->mRootNode->mTransformation = aiMatrix4x4();
// Finally, pre-transform the vertices. We can't do this as part of the
// import process, because we may have changed mTransformation above.
scene = aiApplyPostProcessing(scene, aiProcess_PreTransformVertices);
if(!scene)
dtwarn << "[MeshShape::loadMesh] Failed pre-transforming vertices.\n";
return scene;
}