Subject:
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Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 1 Oct 1999 17:37:53 GMT
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Viewed:
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670 times
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On Fri, 1 Oct 1999 14:02:26 GMT, "Lars C. Hassing" <lch@ccieurope.com>
wrote:
> Then STUD2.DAT could use:
> 0 CCW
> 1 16 0 -4 0 4 0 0 0 4 0 0 0 4 4-4cyli.dat
> 0 CW
> 1 16 0 -4 0 6 0 0 0 4 0 0 0 6 4-4cyli.dat
Why not simply:
> 1 16 0 -4 0 -4 0 0 0 4 0 0 0 4 4-4cyli.dat
> 1 16 0 -4 0 6 0 0 0 4 0 0 0 6 4-4cyli.dat
Assuming the primitives are all defined so their faces are turned outward.
I would see allowing both CW and CCW as a convenience for parts authors.
There's no real difference between one way and the other.
CW has a slight advantage because it's 33% shorter to write, and it doesn't
confuse those "anti-clockwise" people. ;-)
Steve
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Message has 1 Reply:
 | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| Steve: (...) Because our clever rendering programs will notice that the first transformation matrix has negative determinant, and therefore will swap the CW and CCW checks. Play well, Jacob ---...--- -- E-mail: sparre@cats.nbi.dk -- -- Web...: (...) (25 years ago, 1-Oct-99, to lugnet.cad.dev)
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