[vtkusers] Image Volume Mapper shows only one slice

[Kevin H. Hobbs]

For me at least the vtkFixedPointVolumeRayCastMapper sometimes produces very 
wrong results. 

It looks like it is only showing a strange set of slices through the data 
orthogonal to the view direction. The anatomy I'm trying to show is roughly a 
thin spherical shell. The result of the rendering error is that the sphere 
looks like the iso-altitude lines in a topographical map.

I've made and attached a little program using vtkSphereSource and 
vtkGaussianSplatter that produces a volume like the anatomy I want to show, 
and renders it.

For me, all I see is a single bright section of a circle, not the spherical 
shell.

Does anybody else see this?

Does anybody know what's going on?
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