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 15:23:26 GMT
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Viewed:
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677 times
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Steve Bliss wrote:
> On Sat, 9 Oct 1999, "Lars C. Hassing" wrote:
>
> [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.
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 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.
> > 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.
Yes, in a strict sense, but I don't think we need to be that strict.
> And more importantly, there must be WINDING directives from the
> highest level, or clipping can't process correctly.
Hm, isn't WINDING a local directive, that shouldn't be passed on?
/Lars
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Message has 1 Reply:
 | | Re: CW/CCW, vertex sequence, co-planar, convex
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| (...) 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. (...) If a certified part-file can turn clipping on, (...) (25 years ago, 13-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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| (...) Understood and agreed. (...) Also, the primitive files will (generally) require less work than most part-files. [About introducing processing-by-file-type] (...) Yes, if they didn't have a 0 CLIPPING ON directive. That's why I said a good (...) (25 years ago, 11-Oct-99, to lugnet.cad.dev)
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