Hi Ted,
> I'm wondering of there is a general approach at all, within the world
> of groff/PostScript.
There's 3DLDF which takes a textual description of a 3D object and
produces MetaPost output.
http://www.gnu.org/software/3dldf/LDF.html
There's also "G3 - A Language for Typesetting Three Dimensional
Graphics" mentioned at the very bottom of http://troff.org/papers.html
Cheers,
Ralph.
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