[vtkusers] depth-buffer

[sheila timp]

Hi

I'm trying to merge some images: a surface rendered image (rendered by 
myself) and a VTK image of some object.
To properly merge these images I think I need to acces the depth-buffer. Is 
there a way of doing this directly in VTK or would it be better to use 
OpenGL to access the buffers.
Any help or suggestions are welcome.

Thanks in advance

Sheila
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