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 13:33:39 GMT
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Viewed:
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2174 times
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John VanZwieten wrote:
>
> Hey, this idea might work in conjuction with your program that fixes parts.
> If we had a parallel directory (/pi/?) with a copy of each primitive with the
> winding opposite, then whenever the fixer program finds a primitive which
> needs to be inverted, it could just add "pi/" to the primitive name in that
> line. Part authors wouldn't have to mess with this; it would all be done in
> the post-processing stage.
That would be the fastest option for rendering.
> So here's my suggestion for a simplified BFC regime:
>
> 1. We handle BFC certification at the parts level (/parts directory), and
> fix all the parts at "once." New parts would be fixed before they are
> released. By "fixed," I mean that all outward faces are wound CW, and a
> second set of primitives are used to model "inner" faces. Cases of
> double-sided quads would have to be ferreted out and fixed.
>
> It seems to me that Leonardo's program is up to this task, perhaps with a
> little improvement.
If anyone wants to take a look and help, I can send the source to what
I have done so far (it needs VC++ 5.0). I have started working and I
won't have much time to improve it.
> 2. If the rendering program can assume that all parts are correctly CW, then
> it doesn't have to waste time checking for certification, winding direction,
> BFC on/off, etc. If a part is used in a model file with an inverted matrix,
> then that part must be CCW, and the rendering engine can account for that.
> As Michael pointed out, primitives, quads, etc. used in a model cannot be
> BFC'd. Likewise, mock-ups need to be kept out of the /parts directory so
> they won't be BFC'd either.
I still think that the program must check each part for a CCW in the
beginning of the files. We can't assume that all parts are CCW yet and
we shouldn't force authors to verify their parts.
Leonardo
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Message is in Reply To:
 | | Re: Some Words To BFC
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| Leonardo Zide <leonardo@centroin.com.br> wrote in message news:38EB3EB8.D81D2C....com.br... (...) here, (...) Hey, this idea might work in conjuction with your program that fixes parts. If we had a parallel directory (/pi/?) with a copy of each (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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