Phil Cook wrote:

> I thought media would only function with a light_source producing a ray 
> to  sample along as stated in 6.8, AFAIK ambient, like emission, 
> doesn't  produce light in this way even using radiosity.

D'oh. To think, I just got done meddling with the same stuff and came to 
the conclusion that media *does* need a real light.

Hmm, for some reason the mention of an ambient 1 object escaped that 
tiny little pea up there in my skull ;)

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