[vtkusers] Data spacing affects volume rendering quality?

[Elvis Stansvik]

Hi all,

I've just noticed the there's a large difference in rendering quality if I
decrease the spacing of my data (using vtkGPUVolumeRayCastMapper).

I found this very old post from 2007 about the same problem:

    http://public.kitware.com/pipermail/vtkusers/2007-March/040559.html

I was originally using a data spacing of 0.12, which is the voxel size in
centimeters for the particular volume I'm working with (stored in our data
files), but after I tried to divide it by 100.0 during loading, rendering
quality dropped considerably. The reason I wanted to do this is because
it's more convenient if VTK world coordinates are in meters in this
particular application, not centimeters.

Anyone know why volume rendering quality seems dependant on the data
spacing?

Thanks for any clarifications!

Elvis
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