By the very nature of height_field you'll never really get rid of the rough
edges. You can go to a higher resolution image for it, but between pixels the
field will still have rough edges, which will come out as a bit of moire. aa can
counter that but it'd be slow, and a huge hf takes memory.
When I have something like this, I approximate it with a prism.

--
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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