Function WriteMesh

IO/Geometry/vtkGLTFWriter.cxx:453–717

}

void WriteMesh(nlohmann::json& accessors, nlohmann::json& buffers, nlohmann::json& bufferViews,
  nlohmann::json& meshes, nlohmann::json& nodes, vtkPolyData* pd, const char* fileName,
  bool inlineData, bool saveNormal, bool saveBatchId, bool saveActivePointColor,
  bool structuralMetadataExtension, ostream& output, bool binary, size_t* currentBufferOffset)
{
  vtkNew<vtkTriangleFilter> trif;
  trif->SetInputData(pd);
  trif->Update();
  vtkPolyData* tris = trif->GetOutput();

  // write the point locations
  size_t pointAccessor = 0;
  {
    vtkDataArray* da = tris->GetPoints()->GetData();
    WriteBufferAndView(
      da, fileName, inlineData, buffers, bufferViews, binary, output, currentBufferOffset);
    // write the accessor
    nlohmann::json acc;
    acc["bufferView"] = bufferViews.size() - 1;
    acc["byteOffset"] = 0;
    acc["type"] = "VEC3";
    acc["componentType"] = GL_FLOAT;
    acc["count"] = da->GetNumberOfTuples();
    double range[6];
    tris->GetPoints()->GetBounds(range);
    nlohmann::json mins;
    mins.emplace_back(range[0]);
    mins.emplace_back(range[2]);
    mins.emplace_back(range[4]);
    nlohmann::json maxs;
    maxs.emplace_back(range[1]);
    maxs.emplace_back(range[3]);
    maxs.emplace_back(range[5]);
    acc["min"] = mins;
    acc["max"] = maxs;
    pointAccessor = accessors.size();
    accessors.emplace_back(acc);
  }

  std::vector<vtkDataArray*> arraysToSave;
  vtkNew<vtkFloatArray> normals;
  vtkNew<vtkUnsignedCharArray> ucColor0;
  vtkNew<vtkUnsignedShortArray> usColor0;
  vtkNew<vtkFloatArray> fColor0;
  if (saveBatchId)
  {
    vtkDataArray* a;
    if ((a = pd->GetPointData()->GetArray("_BATCHID")))
    {
      arraysToSave.push_back(a);
    }
  }
  if (saveNormal)
  {
    vtkDataArray* a = pd->GetPointData()->GetNormals();
    if (a)
    {
      normals->ShallowCopy(a);