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 15:15:05 GMT
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Viewed:
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356 times
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In lugnet.cad.dev, Larry Pieniazek wrote:
> In lugnet.cad.dev, Ildefonso Junior Zanette writes:
> > Hi,
> >
> > I've created a program to automaticaly BFC certify ldraw parts. Before
> > release this program, I need to make more tests and improve its performace.
>
> I would like to identify if a much simpler program exists... given a
> red/green render like L3Lab mytest6 can produce and a way to tell which
> quad/tri goes with which render, let me point at a quad/tri and just reverse
> the order of the vertices (change the winding, that is) the user would go
> around shooting all "red" polys until the entire part was green.
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. So you click one red
polygon, and all the polygons around resettle themselves. Greenies stay
green, and reds turn green. :)
> Quad2Dat produces surfaces without trying to decide what winding to use, I
> guess.
Yes, unfortunately. :/
> Does anyone know if such a program as I described actually exists?
Yes, I think there is such a program. Or rather, there *was* such a
program. Or maybe maybe my memory is going on me. I seem to remember a
program that would automatically fix polygons, then allow you to adjust
any of them manually. But I don't remember where that was, or who wrote
it, or where it might be now. :(
So, practically speaking, the answer is, "no, there isn't such a
program".
Steve
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Message has 2 Replies:
 | | 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)
| | | Re: Detemining Bad Vertex Sequence
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| (...) Well, my program does exactly this when it finds the correct winding of one polygon. (...) Well, I remember this thread, where Leonardo said that it created such a program: (URL) It's a long and old thread, so, search for the word "green" two (...) (22 years ago, 12-Sep-02, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Detemining Bad Vertex Sequence
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| (...) I would like to identify if a much simpler program exists... given a red/green render like L3Lab mytest6 can produce and a way to tell which quad/tri goes with which render, let me point at a quad/tri and just reverse the order of the vertices (...) (22 years ago, 12-Sep-02, to lugnet.cad.dev)
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