Method WriteToStreamMultiBlock

IO/Geometry/vtkGLTFWriter.cxx:900–1134

}

void vtkGLTFWriter::WriteToStreamMultiBlock(ostream& output, vtkMultiBlockDataSet* mb)
{
  nlohmann::json cameras;
  nlohmann::json bufferViews;
  nlohmann::json buffers;
  nlohmann::json accessors;
  nlohmann::json nodes;
  nlohmann::json meshes;
  nlohmann::json textures;
  nlohmann::json images;
  nlohmann::json samplers;
  nlohmann::json materials;
  std::vector<size_t> topNodes;

  // support sharing texture maps
  std::map<std::string, size_t> textureMap;

  vtkNew<vtkRenderer> ren;
  double bounds[6];
  mb->GetBounds(bounds);
  ren->ResetCamera(bounds);

  // setup the camera data in case we need to use it later
  nlohmann::json anode;
  anode["camera"] = cameras.size(); // camera node
  vtkMatrix4x4* mat = ren->GetActiveCamera()->GetModelViewTransformMatrix();
  for (int i = 0; i < 4; ++i)
  {
    for (int j = 0; j < 4; ++j)
    {
      anode["matrix"].emplace_back(mat->GetElement(j, i));
    }
  }
  anode["name"] = "Camera Node";

  // setup renderer group node
  nlohmann::json rendererNode;
  rendererNode["name"] = "Renderer Node";

  nlohmann::json extensions;
  if (this->PropertyTextureFile)
  {
    vtksys::ifstream propertyTextureStream(this->PropertyTextureFile, ios::binary);
    if (propertyTextureStream.good())
    {
      try
      {
        extensions = nlohmann::json::parse(propertyTextureStream);
      }
      catch (nlohmann::json::parse_error& ex)
      {
        vtkLog(ERROR, << "Parse error " << this->PropertyTextureFile << "at byte " << ex.byte);
      }
    }
    else
    {
      vtkLog(WARNING, "Error: Cannot open property texture file: " << this->PropertyTextureFile);
    }