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 17:58:02 GMT
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Viewed:
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470 times
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On Wed, 20 Oct 1999 15:05:37 GMT, Rui Martins <Rui.Martins@link.pt> wrote:
> You didn't knew in the past, because you didn't have the 0 INVERT
> meta-command. So you can only assume it' NOT inverted.
No. With current files, you don't know, so you can't assume anything.
> If for some reason, it is inverted, then the old .DAT file was wrong,
> and should be corrected.
No, inversions are common.
> You can't expect the new renders to be retro-compatible, but when in
> retrocompatible mode, to provide the same NEW functionalities that they
> were built for, as in the new design mode.
Right. So non-wound-up files can't be backface culled. I don't see what
you're getting at here.
> I would say, that an old file, should not use references with inverted
> matrixes, or you won't be able to have a retrocompatible format.
But we don't get to specify what the old files are allowed to look like.
We only get to deal with them as they are. :(
> but if you really, really, want this, you can inforce this on the
> renderer:
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> /* for a specific reference in this file do */
> if ((this file is NOT optimized) and
> (this file has reference, with an inverted, matrix to another file))
> {
> ClIPPING commands should be ignored in all files referenced down
> through this tree branch.
> }
Nope. Whether the subfile's matrix is inverted or not, you can't assume
the intention was to invert the subfile. Or not.
> Now this is getting really backwards compatible. 8)
Yep. That's the most important requirement.
Steve
"Never trust anything that can think for itself, if you can't see where it keeps its brain."
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Message has 1 Reply:
 | | Re: Several replies to CLIPPING / WINDING
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| (...) Sorry, you are right here. I allways think in some form of winding (CW or CCW) so this one slipped me, once again sorry, you are right. Can't assume nothing. (...) what I said was relative to my way of thinking, without the previous sentence, (...) (25 years ago, 21-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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| (...) This is a problem of the current design (the one beeing used now). You didn't knew in the past, because you didn't have the 0 INVERT meta-command. So you can only assume it' NOT inverted. If for some reason, it is inverted, then the old .DAT (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
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