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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Mon, 21 Jun 2004 13:55:35 GMT
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Viewed:
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3730 times
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In lugnet.cad, Steve Bliss wrote:
> In lugnet.cad, Don Heyse wrote:
> > In lugnet.cad, Steve Bliss wrote:
> > > You could make mirror.ini more human-readable if the 'normal' parts
> > > were just flagged. Something like:
> > >
> > > 2546.DAT default
> > > 41770.DAT exception 41769.DAT 0 1 0 0 0 1 0 0 0 1 0 0 0
> >
> > Actually I was thinking of deleting them from the file to make it
> > smaller. The only problem is remembering which ones were deleted and
> > which ones are new at update time. I'm not sure how to automate
> > additions either way. Probably have to use the sorted properties of
> > parts.lst
>
> Keep a full.mirror.ini, with all the default entries. A simple grep
> drop the extra lines, giving us mirror.ini.
Or generate a parts.lst (and stash it somewhere) before adding parts,
then diff it with the new parts.lst. I'm not sure how grep fits into
your plan though...
> > I think that makes sense. Apply the mirror transform and/or substitution
> > from MIRROR.INI individually to all parts in the subfile, then apply a
> > global mirror (across whatever axis you want) to the whole subfile.
> >
> > It sounds so simple. Could it be?
>
> Well, it depends entirely on whether or not applying two mirroring
> transformations always gives an un-mirrored result. If that's true,
> then we're good.
My math intuition says it should be. There are only two choices for
the sign of the determinant, and I think multiplying a negative matrix
by a negative matrix must result in a positive. Two wrongs *do* make
a right. Right?
Don
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Message is in Reply To:
 | | Re: Quick way to mirror-image a model?
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| (...) Keep a full.mirror.ini, with all the default entries. A simple grep drop the extra lines, giving us mirror.ini. (...) Well, it depends entirely on whether or not applying two mirroring transformations always gives an un-mirrored result. If (...) (20 years ago, 21-Jun-04, to lugnet.cad)
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