[vtkusers] Combining default VTK mappers with multi-pass, multi-volume GPU raycaster

[Ralph Brecheisen]

Hi,

I'm working on a GPU-accelerated multi-volume raycaster (based on
vtkVolumeMapper). In my algorithm I use multiple render passes while
rendering to offscreen buffers (using openGL framebuffer extension).
However, if I wish to combine this mapper with a default vtkPolyDataMapper
however (to render some other actors in the scene), I never get to see the
result of the polydata mapper because inside my multi-volume mapper I take
over the whole screen, doing glClear() and things like that. Is there a way
to do multiple render passes in a way such that other mappers can still
work?

I hope this question is not too vague :)

Greetz,

Ralph
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