>
> This comment was made in the other thread (from 2002) as well I think, but I
> don't quite understand it. If you look at this example from the POVRAY
> documentation: http://www.povray.org/documentation/view/3.6.2/99/, there is this
> tornado effect which is visible in front of a white background. Could this
> tornado not have been made red? If so, that seems similar to what I want to do.

Okay, 'smoke' not tornado. Maybe this is fundamentally different, but is what
gave me the idea that absorptive media could be used effectively in front of a
white background.

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