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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Thu, 6 Apr 2000 20:41:45 GMT
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Viewed:
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3265 times
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In lugnet.cad.dev, Leonardo Zide wrote:
> Steve Bliss wrote:
> >
> > > Can Michael or any other programmers estimate the time savings from being
> > > able to assume all parts as BFC compliant, rather than having to check each
> > > one?
> >
> > Good point. We definitely *should* muddy this discussion up with some
> > real facts. ;)
>
> I can't speak for the other programs but if you allow a part to have
> CCW and CW faces in any OpenGL program, it's going to be slower (but as
> LeoCAD's library is pre-processed than it won't be a problem). If you
> have some parts BFC compliant and some not than it won't make a big
> difference in the total rendering time.
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'm also against requiring all parts to be BFC compliant unless
> there's a *completely automatic* way of checking.
That's good to know.
Steve
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Message has 1 Reply:
 | | Re: Some Words To BFC [DAT]
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| (...) 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. (...) (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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| (...) I can't speak for the other programs but if you allow a part to have CCW and CW faces in any OpenGL program, it's going to be slower (but as LeoCAD's library is pre-processed than it won't be a problem). If you have some parts BFC compliant (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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