[vtkusers] using OpenGL acceleration for volume rendering

[Jim Morash]

Hello,
I've just tried using vtkVolumeTextureMapper2d and then
vtkOpenGLVolumeTextureMapper2d to do some volume rendering, just to
compare them; and I can't seem to see any difference in performance. The
code is running on a Windows 2000 machine with a GeForce card in it that
is supposed to do wonderful things with texture mapping, so I'm curious
if either there is something I need to do for vtk to take advantage of
hardware acceleration, or if the bottleneck in the rendering process is
not the texture mapping but some other part of it which remains CPU
intensive despite help from the GeForce card.
thanks for your help.
--Jim Morash
jmorash at mit.edu