Hi,

I have a large .df3 file I visualize by using it as a media density. I want to
postprocess that density after loading it into povray. For example, set
everything in the density that is smaller (or larger) than a threshold to zero
and rescale the rest.

Effectively, I want to visualize only density values in the interval from
[0.2,0.3], say. Of course, I could do this outside and save a scaled .df3 right
away, but since this is part of a movie and the interval changes (it is used as
a lens to let you go through the materials in the volume), it would mean a lot
of wasted diskspace - the .df3 is really big.

Ideally, I would like to specify a transfer function that maps a density value
in a voxel to an emission value in that voxel. Any ideas how I can do this in
povray? I'm using the latest beta.

Frank

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