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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Fri, 18 Jun 2004 00:38:38 GMT
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Viewed:
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2394 times
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In lugnet.cad, Dave Schuler wrote:
> 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.
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 still trying to dredge my linear algebra
out of the dark recesses of my memory.
Thanks,
Carl
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Message has 2 Replies:
 | | Re: Quick way to mirror-image a model?
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| (...) When you ask a stupid question, I'll let you know! 8^) You're right--it would rotate the brick 180 degrees, but I think that's necessary sometimes (like for the 2x2 slope bricks mirrored left-to-right). But you're also right that this isn't (...) (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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| (...) 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 (...) (20 years ago, 17-Jun-04, to lugnet.cad)
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