Phil Cook nous apporta ses lumieres ainsi en ce 2004/04/14 12:26... :

> Something I was going to ask last week and never got round to for some 
> reason :).
>
> I have two hollow boxes an 'air' and a 'water' with the air sitting 
> just above the water I fill each with a different media and shine a 
> parallel light beam through a slit to pass through both, media 
> interaction is on and I see a beam of light shining through both 
> boxes. Set ior for the water and the beam through the water vanishes.
>
> Does this mean what I think it means and that I'm going to have to 
> rebuild the scene using photons to see a diffracted beam through the 
> water?
>
> -- 
> Phil
>
Probably. Then, if you add some dispertion, you can get realistic colour 
spread.
You may try the caustic option, but it may not display the beam path 
properly.

Alain

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