I think the real problem here is that radiosity is only computed for objects
at a trace depth of 1.  When a light beam hits the plane behind the media,
it has already exceeded a depth of 1 (because it went through the container,
so radiosity calculations are not done.  I'm not sure exactly why this
limitation exists.

-Nathan

ingo wrote:
> 
> How can I avoid the bright red plane behind the media filled container?? Is
> it possible at all?
> 
> ingo
>

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