Special:
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[DAT] (requires LDraw-compatible viewer)
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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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Thu, 17 Jun 2004 20:23:36 GMT
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Viewed:
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2454 times
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In lugnet.cad, Dave Schuler wrote:
> In lugnet.cad, Carl Nelson wrote:
> > In lugnet.cad, Dave Schuler wrote:
> > > For simple mirroring of the parts from left-to-right. This only works for parts
> > > oriented along the X, Y, and Z axes. If parts are rotated at odd angles (like
> > > 30 degrees, or whatever), then this won't quite work, but it should get you
> > > started.
>
> > Dave, I tried your method in Excel and it appears to work with some caveats,
> > though I don't really understand the column mappings:
> >
> > For left-to-right, you said to use columns D and G--that's corresponding to the
> > Y position and the B rotation parameter. Shouldn't that be the X position and C
> > parameter?
>
> You know, I think you're correct about that. I think I'm the last person who
> still uses LEdit as his primary LDraw platform, and for reasons of my own I
> always orient my parts and models rotated 90 degrees relative to the true LDraw
> standard orientation.
>
> Maybe I should give a specific example of the default orientation, with the 2x4
> brick at cursor position x=100, y=0, and z=-10. The letters correspond to the
> Excel columns:
>
> A B C D E F G H I J K L M N O P
>
> 1 16 100 0 -10 1 0 0 0 1 0 0 0 1 3001.DAT
>
> The mirrored left-to-right, the line would read this way:
>
> A B C D E F G H I J K L M N O P
>
> 1 16 100 0 -10 -1 0 0 0 1 0 0 0 -1 3001.DAT
Dumb, dumb, dumb. To be a true "mirror" as you've requested, the second example
should have read this way:
A B C D E F G H I J K L M N O P
1 16 -100 0 -10 -1 0 0 0 1 0 0 0 -1 3001.DAT
The way I originally posted it, the 3001 brick would be flipped left-to-right,
but it would be at the same location as the non-flipped brick.
Sorry about that.
Dave!
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Message has 1 Reply:
 | | Re: Quick way to mirror-image a model?
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| (...) Wouldn't that still be a 180 degree rotation rather than a flip, since -1 0 0 (x y z) * 0 1 0 = (-x y -z) 0 0 -1 ? Or am I laying out my rotation matrix incorrectly (is the first line a b c or a d g)? Sorry for all the stupid questions, I'm (...) (20 years ago, 18-Jun-04, to lugnet.cad)
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Message is in Reply To:
| | Re: Quick way to mirror-image a model? [DAT]
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| (...) You know, I think you're correct about that. I think I'm the last person who still uses LEdit as his primary LDraw platform, and for reasons of my own I always orient my parts and models rotated 90 degrees relative to the true LDraw standard (...) (20 years ago, 17-Jun-04, to lugnet.cad)
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