Christopher James Huff wrote:
> Why? It's more work, possibly slower...what possible reason is there for 
> doing this?

See my media wheel I posted a few ago in p.b.i ...negative absorption
and positive scattering give a scene that, if you don't have any
media-interacting lights, looks the same as (and afaict renders as
quickly as) the same scene without media, but you can turn on a media
interacting light and have it interact.

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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