CAD Development : 7634


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Subject:	Re: Detemining Polygon Winding (Was: New Plugin for LDDesignPad)
Newsgroups:	lugnet.cad.dev
Date:	Wed, 7 Aug 2002 22:23:56 GMT
Viewed:	601 times

Error: read: Count how many *other* polygons this line segment intersects. for Count how many polygons this line segment intersects. Or, if counting your own polygon, switch even and odd.

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		Re: Detemining Polygon Winding (Was: New Plugin for LDDesignPad)
The simple algorithm: Project a normal from any vertex of the polygon to some point far beyond the object. Count how many polygons this line segment intersects. If odd, the normal was pointing in, if even, the normal was pointing out. This assumes (...) (22 years ago, 7-Aug-02, to lugnet.cad.dev)

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