Folks:

  I'm trying to figure out the best way to do an aquarium.  I want to show
the 'ripple pattern' of light moving across the top surface of the water.
This is a 'reef tank' and has high water flow.  I want this to be in effect
a clear block (withan IOR) with a 'wavy' top surface.  My goal is to put
some bright lights in the center where the 'hood' would be to show the
'glitter lines' tracing down through the turbulent top surface.

  I can get the look I want with MegaPOV and a heightfield using a pattern,
but this doens't do the refraction properly.  I've also considered an
Isosurface, but I need some variable 'noise' added to the ripples so that
they can 'move' across the tank.

  If anyone needs, I can post my heightfield attempts, but I'm not sure this
is the right apprach.

  Any suggestions?

        == John ==

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