David,

        That is really cool.  I can't wait for you to
post the source code.  In the mean time, I've tried to
re-create a similar shape.
        The big problem with my version is the facets:
you can see that they are actually two noncoplaner
triangles.  I tried to use a smooth triangle to cover
that but someone I can't get the normals to work.  No
modeler used: this is all pov coding.

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