Subject:
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Re: Detemining Bad Vertex Sequence
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 12 Sep 2002 16:45:28 GMT
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Viewed:
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439 times
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In lugnet.cad.dev, Don Heyse writes:
> In lugnet.cad.dev, Steve Bliss writes:
> > What would be especially good is if there was an option to test and flip
> > adjacent polygons. Once the winding of one polygon is known, adjacent
> > polygons can be automatically wound correctly.
>
> I'm not so sure this is completely true because we allow overlapping
> and intersecting polygons. In fact, there is nothing which prevents
> a single polygon face from being partly on the outside and partly on
> the inside. You can't automagically fix that without breaking up the
> polygon.
Right. There are definitely situations in ldraw parts that won't fit the
nice all-polygons-in-a-mesh model. That's why I said that auto-rewind
should be an 'option'. Meaning, the user can turn it off.
Although for a part to be BFC compliant, it *can't* have any polygons that
are both inside and outside. In this case, it wouldn't matter if the
program had auto-rewind or not - the user would have to break up the polygon
manually, then apply correct winding.
Steve
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Message is in Reply To:
 | | Re: Detemining Bad Vertex Sequence
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| (...) I'm not so sure this is completely true because we allow overlapping and intersecting polygons. In fact, there is nothing which prevents a single polygon face from being partly on the outside and partly on the inside. You can't automagically (...) (22 years ago, 12-Sep-02, to lugnet.cad.dev)
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