Yes, that was the main idea and I will take a look at your suggestion. I 
wanted to know howewer if there was a way to fake it (in order to speed 
up rendering and simplify scene making) like applying some sort of map.

ric

> You're talking about transluscent surfaces. There has never been an 
> ideal way to implement this in POV (any version).
>
> IIRC the best results have been obtained by using a scattering media.
> 
> Playing with this looks hopeful...
> 
> camera
> {
>   location  <0.0, 0.5, -4.0>
>   look_at   <0.0, 0.0,  0.0>
>}
> 
> light_source
> {
>   0
>   color 1
>   translate z*2
>   fade_power 2
>   fade_distance 0.5
>}
> 
> box{
>   <-1,-1,-0.1>,<1,1,0.1>
>   texture{
>     pigment{rgbt 1}
>} }
>   interior{media{scattering{2, 20 extinction 0.25}}}
>   hollow on
>}
> 
> 
> 
> 
>

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