We used to play this game when I was a kid only the hands were rocks!

The rough water is two HF one textured for the wave tops the other the
water. The result when you add reflection, transparency and normals is very
complex and hard to predict. However this is as close as I've been or likely
to get.

Thanks Ken for the sugestion the wavetop HF is simply a hih contrast version
of the first.

I did momentarily consider using the trace command but the memory hit is
ridiculous.

If any one has any ideas on how to improve the shape of the foam please let
me know...

Mick

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