Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Another matrix inverse question
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 11 Apr 2007 04:36:40 GMT
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Viewed:
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1931 times
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In lugnet.cad, Brian Durney wrote:
> handL xform
> 0.98543465 -0.17005472 0.0 0.0
> 0.12024684 0.6968075 0.70710677 0.0
> -0.12024684 -0.6968075 0.70710677 0.0
> 23.558212 25.872986 -10.0 1.0
You might want to check your row/column order for the converted code from
LDView. At least conceptually, I always invision transformation matrices like
so:
A B C X
D E F Y
G H I Z
0 0 0 1
Notice that the translation info is in the last column, not the last row like
your example. The offsets in the LDView code map like so:
0 4 8 12
1 5 9 13
2 6 10 14
3 7 11 15
--Travis
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Message is in Reply To:
 | | Re: Another matrix inverse question
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| (...) I can see the advantages of swapping the off-diagonals for inverting the rotation(s), but that still leaves the question of how to invert translations. In a current example I'm looking at, a minifig hand, the hand is rotated 45 degrees, (...) (17 years ago, 11-Apr-07, to lugnet.cad)
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