[vtkusers] vtkCaptionActor2D always drawn on top of everything else ?

[Renaud Lebrun]

I am trying to visualize text labels in 3D space.

I currently use vtkCaptionActor2D but I can not manage the text to be 
occluded by objects nearer to the camera.

The text generated by vtkCaptionActor2D is always drawn on top of 
everything.


=> Would there be a way to allow vtkCaptionActor2D to be occluded by 
nearer objects ?

Thanks in advance for your answer,
Renaud.