Subject:
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Re: Quick way to mirror-image a model?
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 23 Jun 2004 15:12:46 GMT
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Viewed:
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4125 times
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In lugnet.cad, Carl Nelson wrote:
> In lugnet.cad, Don Heyse wrote:
> > > To unmirror, the C element should be -1.
> >
> > Err, I'm not sure what you mean by unmirror. I got
> > (0 0 1 0 1 0 1 0 0 0 0 0) for a mirror.ini exception matrix, which
> > looks yours except for the sign of that one number.
>
> Unreflect is a better word--just undo the X coordinate swap that
> -1 0 0 0 1 0 0 0 1 does.
Would that work in general cases, or just for right-left reflection?
> I believe they're equivalent things--I'm doing a clockwise rotation, then
> negating the X coordinate swap, you're doing the opposite rotation. I think
> both work for the part.
Actually, I think they're not - "Steve's algorithm" (ha!) requires that both the
MP and ME transforms be mirroring, so that the MF transform would be
non-mirroring.
Steve
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Message has 2 Replies:
 | | Re: Quick way to mirror-image a model?
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| (...) It would need to determine the plane of reflection, and do the second reflection on the X components for left-right or Z components for front-back. (...) I've come up with the same results in all cases so far. I'll do some thinking as to which (...) (20 years ago, 23-Jun-04, to lugnet.cad)
| | | Re: Quick way to mirror-image a model? [DAT]
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| (...) Can you or Don check my work? I'm trying to figure out why the ME transform that I did works in my program and the ME that Don put in mirror.ini works in his code, but not vice-versa. The most likely explanation is that I'm doing something (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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Message is in Reply To:
| | Re: Quick way to mirror-image a model?
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| (...) Unreflect is a better word--just undo the X coordinate swap that -1 0 0 0 1 0 0 0 1 does. I believe they're equivalent things--I'm doing a clockwise rotation, then negating the X coordinate swap, you're doing the opposite rotation. I think (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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