[vtkusers] Volume Rendering with Colored Data?

[Ben FrantzDale]

I'm trying to extend the SimpleTextureMap2D example to be used with 
color data. I tried changing the data file to use COLOR_SCALARS, but 
couldn't get that to work. Looking at the class diagrams it looks like 
vtkVolumeTexturreMapper2D should have access to an RGB texture somehow, 
but how?

--Ben