Method extractRequiredFields

Rendering/VtkJS/vtkVtkJSSceneGraphSerializer.cxx:1088–1171

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void vtkVtkJSSceneGraphSerializer::extractRequiredFields(
  Json::Value& extractedFields, vtkMapper* mapper, vtkDataSet* dataSet)
{
  // FIXME should evolve and support funky mapper which leverage many arrays
  vtkDataArray* pointDataArray = nullptr;
  vtkDataArray* cellDataArray = nullptr;
  if (mapper != nullptr && mapper->IsA("vtkMapper"))
  {
    vtkTypeBool scalarVisibility = mapper->GetScalarVisibility();
    int arrayAccessMode = mapper->GetArrayAccessMode();

    int scalarMode = mapper->GetScalarMode();
    if (scalarVisibility && scalarMode == 3)
    {
      pointDataArray =
        (arrayAccessMode == 1 ? dataSet->GetPointData()->GetArray(mapper->GetArrayName())
                              : dataSet->GetPointData()->GetArray(mapper->GetArrayId()));

      if (pointDataArray != nullptr)
      {
        Json::Value arrayMeta = this->ToJson(pointDataArray);
        arrayMeta["location"] = "pointData";
        extractedFields.append(arrayMeta);
      }
    }

    if (scalarVisibility && scalarMode == 4)
    {
      cellDataArray =
        (arrayAccessMode == 1 ? dataSet->GetCellData()->GetArray(mapper->GetArrayName())
                              : dataSet->GetCellData()->GetArray(mapper->GetArrayId()));
      if (cellDataArray != nullptr)
      {
        Json::Value arrayMeta = this->ToJson(cellDataArray);
        arrayMeta["location"] = "cellData";
        extractedFields.append(arrayMeta);
      }
    }
  }

  if (pointDataArray == nullptr)
  {
    vtkDataArray* array = dataSet->GetPointData()->GetScalars();
    if (array != nullptr)
    {
      Json::Value arrayMeta = this->ToJson(array);
      arrayMeta["location"] = "pointData";
      arrayMeta["registration"] = "setScalars";
      extractedFields.append(arrayMeta);
    }
  }

  if (cellDataArray == nullptr)
  {
    vtkDataArray* array = dataSet->GetCellData()->GetScalars();
    if (array != nullptr)
    {
      Json::Value arrayMeta = this->ToJson(array);