Thank you, Chambers!
Photons were used, but perhaps in not correct way. Now I must read 
better the manual.
;-)
Paolo

 >Chambers  on date 05/08/2008 10:26 wrote:
> 
> Using Photons should do the trick.
> 
> By the way, I'd suggest using media to absorb light rather than filter / 
> transmit in your texture.  It causes the amount of light absorbed to be 
> a function of the thickness of the object, rather than just a constant.
> 
> ...Chambers

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