caustics again.

[vlado]

The problem for the scene was that the water was set to invisible for GI, and also as not shadow casting. Once I enabled these options, the caustics appeared, but they don't really do anything interesting - the light sources just produce quite a bit of ambient light, which is not focused anywhere. If I create a single small sphere light and add some more interesting bump pattern on the water, I can get something more interesting, but I guess that's not the point

Best regards,
Vlado