Method LoadAccessor

IO/Geometry/vtkGLTFDocumentLoaderInternals.cxx:187–296

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//------------------------------------------------------------------------------
bool vtkGLTFDocumentLoaderInternals::LoadAccessor(
  const nlohmann::json& root, vtkGLTFDocumentLoader::Accessor& accessor)
{
  if (root.empty() || !root.is_object())
  {
    vtkErrorWithObjectMacro(this->Self, "Invalid accessor value");
    return false;
  }

  accessor.Name = "";
  vtkGLTFUtils::GetStringValue(root, "name", accessor.Name);

  accessor.BufferView = -1;
  vtkGLTFUtils::GetIntValue(root, "bufferView", accessor.BufferView);
  accessor.ByteOffset = 0;
  vtkGLTFUtils::GetIntValue(root, "byteOffset", accessor.ByteOffset);
  if (accessor.ByteOffset < 0)
  {
    vtkErrorWithObjectMacro(
      this->Self, "Invalid accessor.byteOffset value for accessor " << accessor.Name);
    return false;
  }
  int integerComponentType = 0;
  if (!vtkGLTFUtils::GetIntValue(root, "componentType", integerComponentType))
  {
    vtkErrorWithObjectMacro(
      this->Self, "Invalid accessor.componentType value for accessor " << accessor.Name);
    return false;
  }

  accessor.ComponentTypeValue =
    static_cast<vtkGLTFDocumentLoader::ComponentType>(integerComponentType);

  switch (accessor.ComponentTypeValue)
  {
    case vtkGLTFDocumentLoader::ComponentType::BYTE:
    case vtkGLTFDocumentLoader::ComponentType::UNSIGNED_BYTE:
    case vtkGLTFDocumentLoader::ComponentType::SHORT:
    case vtkGLTFDocumentLoader::ComponentType::UNSIGNED_SHORT:
    case vtkGLTFDocumentLoader::ComponentType::UNSIGNED_INT:
    case vtkGLTFDocumentLoader::ComponentType::FLOAT:
      break;
    default:
      vtkErrorWithObjectMacro(
        this->Self, "Invalid accessor.componentType value for accessor " << accessor.Name);
      return false;
  }

  accessor.Normalized = false;
  vtkGLTFUtils::GetBoolValue(root, "normalized", accessor.Normalized);
  if (!vtkGLTFUtils::GetIntValue(root, "count", accessor.Count))
  {
    vtkErrorWithObjectMacro(
      this->Self, "Invalid accessor.count value for accessor " << accessor.Name);
    return false;
  }
  if (accessor.Count < 1)
  {