[audrius01]

I see. Okay, I'll think something about it.

Thanks for you help, man!

[seghier]

good luck and share your results

[seghier]

test

hdri environment with sky and sun for lighting

[Mihai]

Part of the problem is that you won't be able to see caustics through a refractive material, this is an old problem with unbiased renderers, unless you let it render for a really long time. Search the forums for "pool caustics" for example for some discussions about this and tips.