Function ExtractAnimationData

code/AssetLib/glTF/glTFExporter.cpp:913–999

}

inline void ExtractAnimationData(Asset& mAsset, std::string& animId, Ref<Animation>& animRef, Ref<Buffer>& buffer, const aiNodeAnim* nodeChannel, float ticksPerSecond)
{
    // Loop over the data and check to see if it exactly matches an existing buffer.
    //    If yes, then reference the existing corresponding accessor.
    //    Otherwise, add to the buffer and create a new accessor.

    size_t counts[3] = {
        nodeChannel->mNumPositionKeys,
        nodeChannel->mNumScalingKeys,
        nodeChannel->mNumRotationKeys,
    };
    size_t numKeyframes = 1;
    for (int i = 0; i < 3; ++i) {
        if (counts[i] > numKeyframes) {
            numKeyframes = counts[i];
        }
    }

    //-------------------------------------------------------
    // Extract TIME parameter data.
    // Check if the timeStamps are the same for mPositionKeys, mRotationKeys, and mScalingKeys.
    if(nodeChannel->mNumPositionKeys > 0) {
        typedef float TimeType;
        std::vector<TimeType> timeData;
        timeData.resize(numKeyframes);
        for (size_t i = 0; i < numKeyframes; ++i) {
            size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes;
            // mTime is measured in ticks, but GLTF time is measured in seconds, so convert.
            // Check if we have to cast type here. e.g. uint16_t()
            timeData[i] = static_cast<float>(nodeChannel->mPositionKeys[frameIndex].mTime / ticksPerSecond);
        }

        Ref<Accessor> timeAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), &timeData[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_FLOAT);
        if (timeAccessor) animRef->Parameters.TIME = timeAccessor;
    }

    //-------------------------------------------------------
    // Extract translation parameter data
    if(nodeChannel->mNumPositionKeys > 0) {
        C_STRUCT aiVector3D* translationData = new aiVector3D[numKeyframes];
        for (size_t i = 0; i < numKeyframes; ++i) {
            size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes;
            translationData[i] = nodeChannel->mPositionKeys[frameIndex].mValue;
        }

        Ref<Accessor> tranAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), translationData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
        if ( tranAccessor ) {
            animRef->Parameters.translation = tranAccessor;
        }
        delete[] translationData;
    }

    //-------------------------------------------------------
    // Extract scale parameter data
    if(nodeChannel->mNumScalingKeys > 0) {
        C_STRUCT aiVector3D* scaleData = new aiVector3D[numKeyframes];
        for (size_t i = 0; i < numKeyframes; ++i) {
            size_t frameIndex = i * nodeChannel->mNumScalingKeys / numKeyframes;