Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Some Words To BFC
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 7 Apr 2000 14:47:17 GMT
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Viewed:
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2556 times
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Steve Bliss wrote:
>
> As someone pointed out once, it's not a big deal to get all windings the
> same before passing the data to OpenGL. Just swap the order of the
> points. For quads, switch points 2 and 4. For triangles, switch points
> 2 and 3. This could/should be done while parsing the input files. For
> LeoCAD, I guess that would be when you convert them to your binary
> format.
I don't mind that because I preprocess the files anyway and anyone who
wants to get a good speed increase should do the same. But it's not a
good idea to turn on/off BFC several times and in some cases, it's nicer
to have the faces reversed. Imagine a file like this:
4 16 1 1 1 1 1 1 1
0 INVERSE
4 16 1 1 1 1 1 1 1
4 16 1 1 1 1 1 1 1
4 16 1 1 1 1 1 1 1
0 INVERSE
4 16 1 1 1 1 1 1 1
It would be nicer to have the quads reversed, this could be done by a
program if a person finds it easier to add 0 INVERSE statements.
Leonardo
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Message has 1 Reply:
 | | Re: Some Words To BFC
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| On Fri, 7 Apr 2000, Leonardo Zide wrote: [...SNIP...] (...) Actually I think you missunderstood something (or maybe I did), but the 0 INVERSE meta command is to be used ONLY with file references, that is: 0 INVERSE 1 16 x y z a b c d e f g h i (...) (25 years ago, 7-Apr-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Some Words To BFC
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| (...) As someone pointed out once, it's not a big deal to get all windings the same before passing the data to OpenGL. Just swap the order of the points. For quads, switch points 2 and 4. For triangles, switch points 2 and 3. This could/should be (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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