Method CreateWithAssimp

SampleFramework12/v1.00/Graphics/Model.cpp:404–559

// == Model =======================================================================================

void Model::CreateWithAssimp(const ModelLoadSettings& settings)
{
    const wchar* filePath = settings.FilePath;
    Assert_(filePath != nullptr);
    if(FileExists(filePath) == false)
        throw Exception(MakeString(L"Model file with path '%ls' does not exist", filePath));

    WriteLog("Loading scene '%ls' with Assimp...", filePath);

    std::string fileNameAnsi = WStringToAnsi(filePath);

    Assimp::Importer importer;
    const aiScene* scene = importer.ReadFile(fileNameAnsi, 0);

    if(scene == nullptr)
        throw Exception(L"Failed to load scene " + std::wstring(filePath) +
                        L": " + AnsiToWString(importer.GetErrorString()));

    if(scene->mNumMeshes == 0)
        throw Exception(L"Scene " + std::wstring(filePath) + L" has no meshes");

    if(scene->mNumMaterials == 0)
        throw Exception(L"Scene " + std::wstring(filePath) + L" has no materials");

    fileDirectory = GetDirectoryFromFilePath(filePath);
    forceSRGB = settings.ForceSRGB;

    // Grab the lights before we process the scene
    spotLights.Init(scene->mNumLights);
    pointLights.Init(scene->mNumLights);

    uint64 numSpotLights = 0;
    uint64 numPointLights = 0;
    for(uint64 i = 0; i < scene->mNumLights; ++i)
    {
        const aiLight& srcLight = *scene->mLights[i];
        if(srcLight.mType == aiLightSource_SPOT)
        {
            // Assimp seems to mess up when importing spot light transforms for FBX
            std::string translationName = MakeString("%s_$AssimpFbx$_Translation", srcLight.mName.C_Str());
            const aiNode* translationNode = scene->mRootNode->FindNode(translationName.c_str());
            if(translationNode == nullptr)
                continue;

            std::string rotationName = MakeString("%s_$AssimpFbx$_Rotation", srcLight.mName.C_Str());
            const aiNode* rotationNode = translationNode->FindNode(rotationName.c_str());
            if(rotationNode == nullptr)
                continue;

            ModelSpotLight& dstLight = spotLights[numSpotLights++];

            Float4x4 translation = Float4x4::Transpose(ConvertMatrix(translationNode->mTransformation));
            dstLight.Position = translation.Translation() * settings.SceneScale;
            dstLight.Position.z *= -1.0f;
            dstLight.Intensity = ConvertColor(srcLight.mColorDiffuse) * FP16Scale;
            dstLight.AngularAttenuation.x = srcLight.mAngleInnerCone;
            dstLight.AngularAttenuation.y = srcLight.mAngleOuterCone;