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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Thu, 30 Sep 1999 16:28:48 GMT
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Viewed:
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869 times
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John VanZwieten wrote in message ...
> Your idea for handling two instances of the same primitive would work.
> Another, probably better, way would be to use mirroring to change the
> CW/CCW-ness of the primitive to match the desired direction. For a • primitive
> like 2-4cyli.dat, you'd have to mirror and rotate the primitive to change • the
> CW-ness and still have the primitive function the same.
>
> The key as I see it would be to automate this process, probably with your • ray
> tracing idea. Doing it by hand would be a real drag.
A hypothetical batch dat fixer program could examine the primitives first
and flag the ones that were not closed volumes, since those would be the
only ones that would need to have their reference orientation matrices
mirrored and rotated.
I think there could be problems if some of those non-closed primitives are
asymmetrical.
-Gary
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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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| Gary Williams <graywolf@pcpros.net> wrote in message news:FIvo77.F2B@lugnet.com... (...) In the case I'm talking about, 1 primitive is used in 1 instance to be both an outer face and an inner face. In this case, you'd have to fix it manually by (...) (25 years ago, 30-Sep-99, to lugnet.cad.dev)
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