Ron Parker <ron### [at] povrayorg> wrote:
:>when two of the vertices or all the three are actually the same point.

: when they fall in a line

: if smooth normals are more than 90 from actual normal or its inverse.

  Ok, thanks. There seems to be three clear cases when a triangle is
degenerate. My program only checks the first one. I have to add the other
two as well.

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

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