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 14:39:52 GMT
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Viewed:
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1020 times
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Steve:
> 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.
Hmm??? Yes you're right (again :-).
Play well,
Jacob
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Message has 1 Reply:
 | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| Jacob: (...) Steve: (...) Jacob: (...) It happens every once in awhile. Actually, which approach *would* be better? Examining the transformation matrix to determine the state of inversion, and adjusting the CW/CCW setting to correct for it, would (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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