in news:web.5c94b1c06dda92c81b6c6b3a0@news.povray.org Bill Pragnell
wrote: 

> Ha, not an option I'd considered. Looks like quite a roundabout way
> of doing it, 

The other option is to use TwoVarSurf from meshmaker.inc

an example:
http://chiselapp.com/user/ingo/repository/POV-Ray-
Various/artifact/537ee12ca557206e

I.i.r.c you can also declare a macro (with trace) as __Fuv. You may have 
to fiddle a bit with that though.

ingo

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