message: Fix issue 10826.
diff: @@ -202,6 +202,8 @@ double cv::viz::Widget::getRenderingProperty(int property) const
  #else
  case IMMEDIATE_RENDERING: std::cerr << "this property has no effect" << std::endl; break;
  #endif
  + case AMBIENT: value = actor->GetProperty()->GetAmbient(); break;
  + case LIGHTING: value = actor->GetProperty()->GetLighting(); break;
  case FONT_SIZE:
  {
  vtkTextActor* text_actor = vtkTextActor::SafeDownCast(actor);
  