#5 save view for Renderman

[Simon Warfield]

vtk has a facility to export views in a Renderman
compatible format:
http://www.crd.ge.com/~lorensen/vtkrib/

This enables views to be rendered offline, which is
nice when you want to make really high quality
visualizations. For example, vtk renders some
transparent objects incorrectly because it does not
do triangle sorting - for performance reasons.
Offline rendering can do this.

It would be useful if slicer could be used to construct
a scene when could then be exported to Renderman
format. It would allow much nicer images to be made
for publications.

It may be relatively straightforward to do this
given that vtk has a Renderman exporter class already.