Subject:
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Re: Detemining Polygon Winding (Was: New Plugin for LDDesignPad)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 9 Aug 2002 14:56:02 GMT
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Viewed:
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1092 times
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In lugnet.cad.dev, Orion Pobursky wrote:
> In lugnet.cad.dev, Steve Bliss writes:
> > Also, once you know the direction for one (or more) polygons, any polygons
> > that share an edge can have their direction determined. If polygon #1 has
> > wrapping ABCD, and polygon #2 has vertices ABEF, then polygon #2's wrapping
> > will involve a B->A transition.
>
> Or I could say that the first polygon in a part must be wound correctly and
> then proceed from there.
Correcting the winding shouldn't be too bad -- if the L3 code is
available (ie, look in the ldglite source code) -- check how Lars
detects bad winding, and how he figured the (more) correct winding.
Steve
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