Re: interior swimming pool, caustics problem
I don't think I have anything done with it since 2003... a lifetime ago.
Basically, you follow the above suggestions - use the generator to create your projection map by setting the background color to black.
I would change the defaults to about 128 subdivisions, 16x supersampling, a high resolution and then blur it more in photoshop afterward a bit or downsample to smooth it out.
most of the settings are pretty obvious - depth is the distance from the water surface to the receiving plane, amplitude is the amount of water surface disturbance, etc.
you can export out a tileable animation sequence to use for animations as well - lots of fun!
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