Thanks for the fast answer !

Christopher James Huff wrote:
> It is not impossible to do the same way, it's just that there's a better 
> way. Instead of multiple light sources or cylinders of glowing media, 
> pov can simulate the paths photons actually travel through the scene. 
> Look in the documentation for the photon mapping feature, and the 
> optics.pov demo scene.

I think I'll look again at that example, I already saw it before and I 
think that's what I need but I didn't understood it at first.


> The best way is to do things like use normals and grainy patterns, and 
> otherwise try to get dirty textures. There are ways to add a flat noise 
> to the image, but it does not make the scene itself look more real, it 
> is more of a film effect.

I think the flat noise effect is what I am looking for.  A picture worth 
thousands of words, so :

http://www.elysiun.com/forum/viewtopic.php?t=9743

The pics are not from me and are not done in PovRay, but that's the 
effect I am looking for.

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