Method ExtractPrimitiveAttributes

IO/Geometry/vtkGLTFDocumentLoader.cxx:680–748

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//------------------------------------------------------------------------------
bool vtkGLTFDocumentLoader::ExtractPrimitiveAttributes(Primitive& primitive)
{
  AccessorLoadingWorker worker;
  worker.Accessors = &(this->InternalModel->Accessors);
  worker.BufferViews = &(this->InternalModel->BufferViews);
  worker.Buffers = &(this->InternalModel->Buffers);
  using AttributeArrayTypes =
    vtkTypeList::Create<vtkFloatArray, vtkIntArray, vtkUnsignedShortArray>;

  // Load all attributes
  for (auto& attributePair : primitive.AttributeIndices)
  {
    Accessor accessor = this->InternalModel->Accessors[attributePair.second];
    // Create array
    if (attributePair.first == "JOINTS_0")
    {
      primitive.AttributeValues[attributePair.first] =
        vtkSmartPointer<vtkUnsignedShortArray>::New();
    }
    else
    {
      primitive.AttributeValues[attributePair.first] = vtkSmartPointer<vtkFloatArray>::New();
    }

    worker.NormalizeTuples = attributePair.first == "WEIGHTS_0";
    worker.LoadTangents = attributePair.first == "TANGENT";

    // Read data
    worker.Setup(attributePair.second, accessor.Type);
    vtkArrayDispatch::DispatchByArray<AttributeArrayTypes>::Execute(
      primitive.AttributeValues[attributePair.first], worker);

    if (!worker.Result)
    {
      vtkErrorMacro("Error loading mesh.primitive attribute '" << attributePair.first << "'");
      return false;
    }
  }

  worker.NormalizeTuples = false;
  worker.LoadTangents = false;

  // Load morph targets
  for (auto& target : primitive.Targets)
  {
    for (auto& attributePair : target.AttributeIndices)
    {
      if (attributePair.first != "POSITION" && attributePair.first != "NORMAL" &&
        attributePair.first != "TANGENT")
      {
        vtkWarningMacro(
          "Invalid attribute name for morph target: " << attributePair.first << " ignoring.");
        continue;
      }
      Accessor accessor = this->InternalModel->Accessors[attributePair.second];
      target.AttributeValues[attributePair.first] = vtkSmartPointer<vtkFloatArray>::New();
      worker.Setup(attributePair.second, accessor.Type);
      vtkArrayDispatch::DispatchByArray<AttributeArrayTypes>::Execute(