Subject:
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Re: Comprehensive meta-command list
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 8 Oct 1999 07:02:11 GMT
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Viewed:
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494 times
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Gary Williams wrote in message ...
>
> Lars C. Hassing wrote in message <939050465.592693@ns.cci.dk>...
> > Since INVERT is directly related to the CW and CCW parameters of the FACE
> > meta-command, why not let it be yet another parameter to FACE ?
>
>
> Because INVERT and FACE have very different meanings.
>
> > I think the INVERT is only meant as a convenience, since
> > 0 FACE CCW
> > ...
> > 0 FACE INVERT
> > 1 16 ...
> > 0 FACE INVERT
> >
> > is the same as
> >
> > 0 FACE CCW
> > ...
> > 0 FACE CW
> > 1 16 ...
> > 0 FACE CCW
>
>
> No, it isn't.
>
> FACE only affects polygons in the same file. Ideally this meta-command
> would only occur once in a given dat file.
>
> INVERT inverts polygons from other files.
Well, my assumption was that CCW was the default and that the current
facing was passed to the subfile. Under these circumstances I think
that my two examples are equivalent!
But I admit that the idea that FACE (C)CW only affects the triangles/
quads of the current file, and that INVERT only affects subfiles
is much easier to comprehend and thus is a better solution.
/Lars
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Message has 1 Reply:
 | | Re: Comprehensive meta-command list
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| Lars C. Hassing wrote in message <939367581.966085@ns.cci.dk>... (...) In addition to being easier to comprehend, it has the advantage that each part and primitive file only has to concern itself with its own vertex order, and is not dependent on (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Comprehensive meta-command list
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| Lars C. Hassing wrote in message <939050465.592693@ns.cci.dk>... (...) True. But when manually examining a file, if you come across a 0 INVERT you wouldn't know whether this was the beginning or the end of the inverted references, without a bit of (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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