WOW that was fast ;-)

Normals would work, but I want the photons to trace through the 'upper'
surface and show the lines on the bottom of the tank (sand).  I'm trying to
use a surface function so that you can see the sides of the waves through
the side of the tank as well as get the pattern of the lines on the bottom
of the tank.

        == John ==

> Have you thought about using surface normals ? You can also feed an
> isosurface function into a normal statement to modifiy the waveform
> to your liking.
>
> --
> Ken Tyler

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