Subject:
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Re: [Parts Tracker] More BFC Primitives
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Sat, 6 Apr 2002 01:22:59 GMT
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Viewed:
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475 times
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In lugnet.cad.dev.org.ldraw, Steve Bliss writes:
> In lugnet.cad.dev.org.ldraw, Tony Hafner writes:
> > In lugnet.cad.dev.org.ldraw, Steve Bliss writes:
> > > > Um... Not to stir the pot or anything but I was reading the BFC proposal on
> > > > your website and noticed that the BFC specification says that all primitves
> > > > must be certified CCW. Did this get revised via discussion and not updated?
> >
> > For starters, I recently tried to track down the BFC specification but
> > couldn't find it (on ldraw.org or on Steve's site). Could someone post the
> > link please?
>
> <http://www.geocities.com/partsref/bfc/>
>
> > > At this point, I'm as inclined to delete the clause from the spec as to
> > > keep it (and modify the primitives specified as CW).
> >
> > If it doesn't matter from a performance perspective, I vote you kill the
> > clause.
>
> I think the only way it would matter for performance is if we decided that
> the *entire* library would be CW or CCW, and so rendering programs wouldn't
> have to check the winding direction at all. And that would be a very small
> difference in speed.
Given the fact that they have to check whether or not a given file has been
mirrored, I can't see that the directionality would make a large difference.
If everything used CCW, then only mirrored ones would need to be reordered
(assuming the renderer is going to reorder them). In any event, I can only
see this having an effect on load time, since I would expect a renderer that
is making use of BFC information to reorder all BFC'd polygons to have the
same winding, after taking mirroring into account.
--Travis Cobbs (tcobbs@REMOVE.halibut.com)
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Message has 1 Reply:
 | | Re: [Parts Tracker] More BFC Primitives
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| Hello, Comments below... Travis Cobbs wrote: > In lugnet.cad.dev.org.ldraw, Steve Bliss writes: > >>In lugnet.cad.dev.org.ldraw, Tony Hafner writes: >> >>>In lugnet.cad.dev.org.ldraw, Steve Bliss writes: >>> >>>>>Um... Not to stir the pot or (...) (23 years ago, 6-Apr-02, to lugnet.cad.dev.org.ldraw)
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Message is in Reply To:
| | Re: [Parts Tracker] More BFC Primitives
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| (...) (URL) (...) I think the only way it would matter for performance is if we decided that the *entire* library would be CW or CCW, and so rendering programs wouldn't have to check the winding direction at all. And that would be a very small (...) (23 years ago, 5-Apr-02, to lugnet.cad.dev.org.ldraw)
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