There are many ways I've seen to simulate water, but all are really
illusions on a uniform surface.  So if you have a vertical surface coming
straight up out of the 'water', you get a perfectly straight line at the
intersection.  What options are there that will form actual height-ripples
in a surface?  I know of bump_map and height_field, all of which require an
image for the height field, but I'd rather not go that way.

Thanks!
-Eric

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