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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Mon, 11 Oct 1999 14:03:57 GMT
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Viewed:
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621 times
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On Sat, 9 Oct 1999 00:04:50 GMT, "Lars C. Hassing" <lch@ccieurope.com>
wrote:
> What I meant to stress was, that you cannot say subfile references are
> compliant unless the orientations (inside/outside-ness) of the subfiles
> are known.
Understood and agreed.
> > Having said that, I do agree that the primitives should get the first
> > attention, because those files get used more than any others.
> [1] ;-)
Also, the primitive files will (generally) require less work than most
part-files.
[About introducing processing-by-file-type]
> My suggestion is a pragmatic approach to enable the numerous existing
> models to benefit from backface-culling.
> OK, a good rendering program could implicitly add a 0 CLIPPING ON,
> but what about submodels? Won't they introduce a CLIPING OFF hole
> in the recursive chain?
Yes, if they didn't have a 0 CLIPPING ON directive. That's why I said a
good editing program will automatically add the CLIPPING ON directive to
new files.
> That's why I think the parts should be the starting point for clipping.
>
> There is nothing stopping knowledgeable modellers from using the
> advanced features by initiating clipping ealier in the chain, but by
> default clipping would start with the parts (the certified ones).
By default, clipping won't start at all. There must be a CLIPPING ON
directive to enable clipping. And more importantly, there must be WINDING
directives from the highest level, or clipping can't process correctly.
Steve
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Message has 1 Reply:
 | | 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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Message is in Reply To:
| | Re: CW/CCW, vertex sequence, co-planar, convex
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| (...) Yes, you can of course settle for checking only the tris/quads of a file and put UNKNOWN around subfile references. But then you would miss the most important speed boost coming from the primitives, which are responsible for the majority of (...) (25 years ago, 9-Oct-99, to lugnet.cad.dev)
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