Subject:
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Re: CW/CCW, vertex sequence, co-planar, convex
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 13 Oct 1999 21:19:12 GMT
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Viewed:
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661 times
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On Mon, 11 Oct 1999 15:23:26 GMT, "Lars C. Hassing" <lch@ccieurope.com>
wrote:
> Will you really require all existing models to go through a new good
> editing program, before they could benefit from backface-culling?
Sure. But I also feel that it would make sense for rendering programs to
give the user control, so that clipping can be set to default to off, or
default to on, or to be totally disabled.
> I don't think that is necessary. Once an old model references a certified
> part, clipping can be done for that part and its subfiles. Referencing an
> uncertified part would turn clipping off for that part and its subfiles.
If a certified part-file can turn clipping on, then any certified file can
use clipping. Where's the difference between a certified part, and any
other certified file?
> Hm, isn't WINDING a local directive, that shouldn't be passed on?
Ergg, you're right. That seems to be a shortcoming (for us) of the
CLIPPING/WINDING approach -- there's nothing to clearly indicate that a
file is certified. The presence of a WINDING meta-statement *could* be
taken as a clear indication that the file has been checked (or not-checked,
in the case of 0 WINDING UNKNOWN).
Hmm. Let me take a step back, and think about it. I'll post tomorrow.
Steve
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Message has 1 Reply:
 | | Re: CW/CCW, vertex sequence, co-planar, convex
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| Steve Bliss wrote... (...) Yes, rendering programs should have these reasonable options. But I think it is safe to start clipping from opaque certified parts. (...) Parts are objects with obvious orientation. You are not in doubt what is (...) (25 years ago, 14-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: CW/CCW, vertex sequence, co-planar, convex
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| (...) Yes, this works for *new* models/submodels. Will you really require all existing models to go through a new good editing program, before they could benefit from backface-culling? I don't think that is necessary. Once an old model references a (...) (25 years ago, 11-Oct-99, to lugnet.cad.dev)
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