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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Mon, 4 Oct 1999 18:28:12 GMT
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Viewed:
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1018 times
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Steve Bliss wrote in message <37f8c86b.239282689@lugnet.com>...
> On Sun, 3 Oct 1999 15:37:34 GMT, "Gary Williams" <graywolf@pcpros.net>
> wrote:
>
> > No.
> >
> > Our software will detect mirror operations and correct for them.
>
> I've been thinking the exact opposite -- mirroring should be a valid method
> for turning subfiles inside-out, and the software doesn't need to do
> anything special to deal with it (except to notice the inversion, and pass
> that info on to the subfile). That's the reason the 0 INVERT flag would be
> needed -- to tell the rendering program that it needs to correct the
> inversion for the following command.
>
> Steve
But more often than not, when mirroring an element or subassembly, it's not
the intent of the author to turn it inside out. Typical model builders
shouldn't concern themselves with inversion, which should happen totally
behind the scenes.
Parts authors will be the primary group of people who care about inversion.
-Gary
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Message has 2 Replies:
 | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| (...) True. But mirroring is an advanced technique. Well, maybe intermediate-level. Anyway, it's not for beginners. (...) True. Allowing mirroring/inversion for parts authors allows them to use a single set of primitives, while keeping part-files (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
| | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| Gary Williams wrote in message ... (...) I agree with Gary that mirroring should not turn subfiles inside-out. The rendering program should correct (C)CW-ness by looking at the transformation. Part authors should use the INVERT for explicitly (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| (...) I've been thinking the exact opposite -- mirroring should be a valid method for turning subfiles inside-out, and the software doesn't need to do anything special to deal with it (except to notice the inversion, and pass that info on to the (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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