[vtkusers] offscreen rendering bug ?

[alext at win.tue.nl]

  Hi,

  I've just downloaded the vtkOpenGlOffscreenRenderWindow written by John
Shalf (code at: http://www.ncsa.uiuc.edu/~heiland/vtk/vtkOffScreen.tar.gz).
This seems to be the only portable manner I can render something offscreen
under UNIX - for Windows, there's a similar class included already in vtk's
contrib ditectory.

  However it seems to me that vtkOpenGlOffscreenRenderWindow has a few bugs.
Namely, I can't manage to use it without Pbuffers _and_ with volume
rendering actors. I don't get anything rendered offscreen. As soon as I
switch to Pbuffers (I'm on an O2), all works fine, I get my offscreen
rendering of the volumes.

  Anyone knowing about this problem ? Anyone knowing how to render
volumes/geometries offscreen under X (besides the Mesa solution, I'm using
OpenGL and not the Mesa library).

  Thanks in advance, 

  Alex

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 Dr. Alexandru C. Telea      | Technische Universiteit Eindhoven
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