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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Sun, 3 Oct 1999 02:56:28 GMT
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Viewed:
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991 times
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> 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
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Message has 1 Reply:
Message is in Reply To:
 | | 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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