[vtkusers] Volume Rendering Performance With Two Volumes

[ianl]

Two volumes in different VTK windows

I see the same issue with the AMD FirePro V5900 card (also 2GB) we have
here, but much less pronounced. Volumes of a smaller size seem to trigger
the problem more easily, so it seems as though the 900 slice sets are over
some threshold for that card and are generally slower so it is difficult to
tell. We don't have any NVidia cards unfortunately at the moment to test
with.



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