Thank you all for your comments.

About the refraction mistake viewed by Rune. It's something I didn't noticed
(in fact, I checked with the fish tank I have at home...). The problem I
faced with PovRay is that I wasn't able to define with different properties
the air <-> water, air <-> glass and glass <-> water surface properties. I
made some CSG operation in order to have the ability to define glass <->
water property and I fixed it without ior (the idea was that there is no so
much difference between water and glass). I think it is the reason of the
strange effect.

Regards,
Fidos

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