> THANKS so much for sharing the details. This kind of heightfield 
> generation
> is new to me, too, and your lucid explanation is extremely helpful, far
> beyond the POV docs. Much appreciated!
>
> Ken W.
>

Thanks.  I came across this capability a few years ago when I was meddling 
with tileable patterns.  I occasionally dig out the code when I see a need. 
I find that they are much more convincing than surface normals (for some 
reason they always seem flat to me) and far faster than isosurfaces. 
However they are somewhat limited to flat surfaces.

-tgq

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