> 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?
>
>
If possible, try to only use 2D coordinate for your polygon, then, apply 
any required rotation.

Yes, there is some margin error that is tolerated, it's the epsilon 
value. It's rather small, around 1e-9 I think.

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