CAD Development : 7635


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Subject:	Re: Detemining Polygon Winding (Was: New Plugin for LDDesignPad)
Newsgroups:	lugnet.cad.dev
Date:	Wed, 7 Aug 2002 22:28:06 GMT
Viewed:	642 times

In lugnet.cad.dev, Erik Olson writes: > 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. Thanks for the info, but it's easier written than applied. It'll take an entire revamp of my code. -Orion

Message has 1 Reply:

		Re: Detemining Polygon Winding (Was: New Plugin for LDDesignPad)
(...) I wouldn't bother. This well known algorithm is based on an assumption that simply isn't true for the parts files. The assumption is that there is one single enclosed space inside of each part. But I think the studs are open at one end and are (...) (22 years ago, 8-Aug-02, to lugnet.cad.dev)

Message is in Reply To:

		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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