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 13:49:51 GMT
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Viewed:
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1962 times
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Steve Bliss 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.
>
> Question #1: how does the program know that a primitive needs to be
> inverted?
When it finds that any face of a primitive needs to be inverted. We
would have to fix the current primitives so that all faces are pointing
to the same direction. Take a look at the sphere primitive for example,
it has faces pointing inside and outside the sphere.
> Question #2: why is adding "pi\" preferable to substituting a different
> file name (so the inverted primitives are in the p\ directory) or
> inserting a 0 INVERTNEXT statement?
I think the "pi\" dir was just an example, it could have any other
name. Adding a 0 INVERTNEXT would require more time to parse a file.
> > It seems to me that Leonardo's program is up to this task, perhaps with a
> > little improvement.
>
> Have you used Leonardo's program? I've heard of some different programs
> that can help with sorting polygons, but I haven't heard of anyone
> publishing one yet...
If anyone wants to take a look, just ask. I don't have the time to
create a web page and make something official so I'll need some help to
finish the program.
Leonardo
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Message has 2 Replies:
 | | Re: Some Words To BFC
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| (...) The primitives should be the first thing fixed, in any case. :) I think it would be safe for the cleanup program to assume that primitives are BFC-ready. Which could be a help for automatic cleanup of part files. (...) Some technical points: (...) (24 years ago, 6-Apr-00, to lugnet.cad.dev)
| | | Re: Some Words To BFC
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| (...) OK, that sounds reasonable -- it's something that a clean-up program could look for, even though it's not practical for a rendering program to do the same. Steve (24 years ago, 19-Apr-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Some Words To BFC
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| OK. I've thought about most of John's posting, and I think I'm ready to make an intelligible response. Just to be sure I caught everything, here's a (hopefully quick) re-iteration. The major differences between John's proposal and the proposal I (...) (24 years ago, 6-Apr-00, to lugnet.cad.dev)
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