Edmund Horner <ejr### [at] paradisenetnz> wrote:
: The shape is defined by four points, with a surface made of straight lines
: forming a grid over the "square".  Apparently this is a quite reasonable
: shape, and is useful for making surfaces.

: But I do not think pov-ray provides it.  Anyone got any advice on how I best
: go about adding it?

  There's this kind of shape in VanSickle's matrix page. It may be exactly what
you are looking for. It's also fast to create and render.
  Look at the section called "The saddle" at:
http://users4.50megs.com/enphilistor/matrix.htm

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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