Subject:
|
Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
|
Newsgroups:
|
lugnet.cad.dev
|
Date:
|
Sun, 3 Oct 1999 02:56:28 GMT
|
Viewed:
|
887 times
|
| |
![Post a public reply to this message](/news/icon-reply.gif) | |
> Steve:
>
> > 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.
Jacob:
> Because our clever rendering programs will notice that the
> first transformation matrix has negative determinant, and
> therefore will swap the CW and CCW checks.
Why? Having a negative determinate *should* turn subfiles inside-out.
IMO. That's a useful function. Having programs checking determinates is
not useful, and wastes rendering time.
Steve
|
|
Message has 1 Reply:
Message is in Reply To:
![](/news/x.gif) | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
|
| 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)
|
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)
![](/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 (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/46.gif) ![You are here](/news/here.gif) ![](/news/46.gif) ![Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) -Jacob Sparre Andersen (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/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)
![](/news/x.gif) ![](/news/268.gif) ![(Cancelled)](/news/x.gif) ![](/news/46.gif) ![(Cancelled)](/news/x.gif)
![](/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)
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|