> Well, what would you expect to happen with a white background? That the
> streaks of light caused by the scattering media will be even brighter
> than white?

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.

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