Method LoadNode

IO/Geometry/vtkGLTFDocumentLoaderInternals.cxx:801–927

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//------------------------------------------------------------------------------
bool vtkGLTFDocumentLoaderInternals::LoadNode(
  const nlohmann::json& root, vtkGLTFDocumentLoader::Node& node)
{
  node.Camera = -1;
  vtkGLTFUtils::GetIntValue(root, "camera", node.Camera);

  node.Children.clear();
  vtkGLTFUtils::GetIntArray(root, "children", node.Children);

  node.Skin = -1;
  vtkGLTFUtils::GetIntValue(root, "skin", node.Skin);

  node.Mesh = -1;
  vtkGLTFUtils::GetIntValue(root, "mesh", node.Mesh);

  // Load matrix value
  std::vector<double> matrixValues;
  node.Matrix = vtkSmartPointer<vtkMatrix4x4>::New();
  node.Matrix->Identity();

  // A node can define either a 'matrix' property, or any of the three 'rotation', 'translation' and
  // 'scale' properties, not both.
  if (vtkGLTFUtils::GetDoubleArray(root, "matrix", matrixValues))
  {
    // If the node has defined a skin, it can't define 'matrix'
    if (node.Skin >= 0)
    {
      vtkErrorWithObjectMacro(this->Self, "Invalid node.matrix value with node.skin defined.");
      return false;
    }
    if (matrixValues.size() ==
      vtkGLTFDocumentLoader::GetNumberOfComponentsForType(
        vtkGLTFDocumentLoader::AccessorType::MAT4))
    {
      node.Matrix->DeepCopy(matrixValues.data());
      node.Matrix->Transpose();
      node.TRSLoaded = false;
    }
  }
  else
  {
    // Load translation, rotation and scale values
    if (vtkGLTFUtils::GetFloatArray(root, "scale", node.InitialScale))
    {
      if (node.InitialScale.size() !=
        vtkGLTFDocumentLoader::GetNumberOfComponentsForType(
          vtkGLTFDocumentLoader::AccessorType::VEC3))
      {
        vtkWarningWithObjectMacro(
          this->Self, "Invalid node.scale array size. Using default scale for node " << node.Name);
        node.InitialScale.clear();
      }
    }
    if (node.InitialScale.empty())
    {
      // Default values
      node.InitialScale.insert(node.InitialScale.end(), { 1, 1, 1 });
    }