Subject:
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Re: Line in the Sand
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 9 Nov 1999 17:45:03 GMT
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Viewed:
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2953 times
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On Mon, 8 Nov 1999 16:38:50 GMT, Rui Martins <Rui.Martins@link.pt> wrote:
> > > > UNKNOWN = winding direction is unknown or variable. This setting will
> > > > disable clipping, until the winding is reset.
> > >
> > > Using someones expression, the UNKNOWN is 'syntatic sugar', because this
> > > will be implemented internally as CLIPPING OFF.
> > > If the user want's to inform that the 'winding' is not known,
> > > then he can make a regular comment, and use CLIPPING OFF
> >
> > This sounds correct, but do we want to eliminate this
> > syntactic sugar?
>
> why not ?
> Could you give a good reason !
Yes. WINDING UNKNOWN allows a DAT author to specify what is happening in the
file more precisely than CLIPPING OFF. Adding WINDING DOUBLE-SIDED would allow
even more author-precision, but there is no practical difference between
DOUBLE-SIDED and UNKNOWN, AFAIK.
There is a slight practical difference between WINDING UNKNOWN and CLIPPNG OFF
-- WINDING is a file-specific setting; the file's author can assume that they
always know the current WINDING setting. CLIPPING is passed down the reference
branch, and the current file should make *as few* assumptions about the CLIPPING
setting as possible.
Steve
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Message has 1 Reply:
 | | Re: Line in the Sand
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| Steve Bliss wrote... (...) the (...) allow (...) OFF (...) they (...) reference (...) CLIPPING (...) Good point! (...) Or you could write: 0 CERTIFY BFC | 0 CERTIFY NOBFC 0 WINDING CW | 0 WINDING CCW | 0 WINDING UNKNOWN (I don't think "0 WINDING" (...) (25 years ago, 10-Nov-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Line in the Sand
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| (...) Agreed, it's logical. Should is too strong ! not like must, but strong anyway. (...) of course, but all files start on one root, if that is no BFC certified, than no acceleration. (...) but a certified part can have sub parts not certified ! (...) (25 years ago, 8-Nov-99, to lugnet.cad.dev)
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