Bruno Cabasson wrote:
> 
> Thanks for your reply. Waiting for someone to answer, I made a few more
> tries and tested the trick with emissive media. I don't find it very
> satisfatory in that the object is illuminated, but emits light. In a
> radiosity scene, it is preferable to avoid this.
> 
> I am trying another idea ...

Bruno,

You might try Alain's idea of faking it with other light_sources. You 
need not worry about the other lights affecting the scene if you make a 
light_group, like so:

/* begin pseudocode
light_group{
  light_source{...}
  light_source{...}
  object{ media_object }
}
end pseudocode*/

The lights will only illuminate the media object, so you are free to try 
different light_source settings to fake global illumination. The lights, 
however, may cast shadows from unlit objects. Be aware of that.

Sam

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