Subject:
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Re: Several replies to CLIPPING / WINDING
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 20 Oct 1999 10:36:25 GMT
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Reply-To:
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rui.martins@link.pt*StopSpam*
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Viewed:
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356 times
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On Tue, 19 Oct 1999, Lars C. Hassing wrote:
> <SNIP>
>
> I am trying to find out when to actually start clipping.
> You say "every .DAT file which has tris or quads is a candidate for CLIPPING",
> but when can a program use that info?
By candidate, I meant, someone could optiomize it, a place a
0 CLIPPING ON meta-command on it, and get some benefit.
If you use enable clipping, but you have no graphic primitives in your
file (assuming clipping is stryctly local), than you wouldn't gain
anything from this act.
> Would you require an unbroken chain of certified DAT files?
NO,
Every file is a closed unit, anynone can be certified or not, and you
can mix them (in a chain), that each one will be drawn/optimized for
itself, no dependent on previous files (in the chain).
The goal is, if this particular file is optimized, then everyone that
uses it will benefit, no matter if the one who uses it, is itself
optimized or not.
> <SNIP>
> > No that is not the case, because as I have already said, an optimized
> > .dat file will have only the meta command "0 CLIPPING ON" [1]
> > The fact that winding is correct does not necessarily allow you to due
> > clipping. It's required by clipping, but WINDING (CCW/CW) does not
> > imply clipping.
>
> No, but what is the sense in making winding correct and turn off clipping?
> /Lars
Prevent that some graphic librarys to DRAW erroneously, or not draw at
all, and also,
because with a correct winding, you know, (or can determine) the
orientation of the polygon (face)
Rui Martins
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Message has 1 Reply:
 | | Re: Several replies to CLIPPING / WINDING
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| (...) That's not true. If a super-file is not certified, then there's no way to tell if the subfile is normal or inverted. So when a file is referenced by a non-certified super-file, it can't be clipped, even if the referenced file is certified. (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Several replies to CLIPPING / WINDING
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| Rui Martins wrote in message ... (...) I am trying to find out when to actually start clipping. You say "every .DAT file which has tris or quads is a candidate for CLIPPING", but when can a program use that info? Would you require an unbroken chain (...) (25 years ago, 19-Oct-99, to lugnet.cad.dev)
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