Florentine Audet wrote:

> ( what I am trying to do is imaging about under_water
> simulation,  and stuff like that... Say,  a clear water,
> with some visible ground in the bottom...

Caustics are most certainly the effect you are looking for.
This is the effect you see at the bottom of a swimming pool
or the light shining through a glass of water.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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