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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769 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: ![](/news/x.gif) | | 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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Message is in Reply To:
53 Messages in This Thread: ![CW/CCW, vertex sequence, co-planar, convex, (115kB) -Lars C. Hassing (29-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Leonardo Zide (29-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -John VanZwieten (29-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Lars C. Hassing (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -John VanZwieten (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -John VanZwieten (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Steve Bliss (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (1-Oct-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Steve Bliss (3-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (3-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Bram Lambrecht (3-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (3-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Steve Bliss (4-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (4-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Steve Bliss (5-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (5-Oct-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Lars C. Hassing (8-Oct-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Leonardo Zide (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Lars C. Hassing (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Jacob Sparre Andersen (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -John VanZwieten (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Leonardo Zide (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Jeff Boen (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Leonardo Zide (1-Oct-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Steve Bliss (1-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Jacob Sparre Andersen (1-Oct-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/268.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Gary Williams (1-Oct-99 to lugnet.cad.dev)](/news/x.gif)
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![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Jeff Boen (29-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Steve Bliss (30-Sep-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Leonardo Zide (30-Sep-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Jeff Boen (1-Oct-99 to lugnet.cad.dev)](/news/x.gif)
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![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -John VanZwieten (4-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Gary Williams (4-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Lars C. Hassing (8-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/246.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Jacob Sparre Andersen (8-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Lars C. Hassing (8-Oct-99 to lugnet.cad.dev)](/news/x.gif)
![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Steve Bliss (8-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Lars C. Hassing (9-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Steve Bliss (11-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Lars C. Hassing (11-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Steve Bliss (13-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Lars C. Hassing (14-Oct-99 to lugnet.cad.dev)](/news/x.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex -Steve Bliss (15-Oct-99 to lugnet.cad.dev)](/news/x.gif)
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