There is an include file devotes completely to tetrahedra
at:

http://quark.vpplus.com/~redbeard/raytrace/POVRay-Util.html

called :

http://quark.vpplus.com/~redbeard/raytrace/utils/pyramid.zip

I haven't tried it, though.... it advertises offering
pyramids in a variety of coordinate specifications.
It is dated 27 Oct 1996, so will need macro conversion
to make it competitive with Mark's version.

Dan


-- 
http://www.flash.net/~djconnel/

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