This may not help you. But you don't have to to use 'inc' or 'pov' as a file
file attribute. Any three letters will do. I use 'prm' to denote a prism file
and
'pol', 'sor', 'lat', for polygons, surface of revolutions, and lathe objects.
the main thing is if you use your own file attribute names is to be constant.
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Have Fun!
