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Am 09.11.2016 um 09:41 schrieb stevenvh:
> I recently bumped into a problem when working on polygons. Most of my pentagons
> weren't generated. In the end changing the points' coordinates from 8
> significant digits to 15 significant digits solved the problem. Shouldn't 8
> digits be sufficient? That's enough to describe a 100 mm object with a 1 micron
> accuracy. Shouldn't POVray take some margin of error into account?
Maybe you're simply using an unsuited scale. POV-Ray uses fixed absolute
margins for many purposes, rather than margins relative to the
magnitudes involved (though I think this is not the problem here).
Also, the absolute location of the polygons may play a role. If you're
specifying vertex coordinates with 8 significant digits, but your
polygon contains a pair of vertices that differ only in, say, the last 2
of those 8 digits, then rounding can be expected to introduce a
deviation from the plane of about 1%.
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