vtkAssembly does not implement the vtkProp::RenderOverlay(vtkViewport * ren) method
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The vtkAssembly of 5.6.0 does not have the recursive method: int vtkPropAssembly::RenderOverlay(vtkViewport * ren);
Hybrid 2D/3D actors like vtkAxesActor do implement this method to get their 2D data rendered. The vtkAssembly does need this method, too. Not only because of the existence of these classes but rather because of their base class vtkProp3D which only defines the abilities to get positioned and oriented in 3D space and NOT that they are restricted to only render 3D graphics.
E.g. if you don't add this method to vtkAssembly, the vtkAxesActor cannot display its caption labels when it has been added to the a vtkAssembly.