Subject:
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Re: Inverse matrix?
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Newsgroups:
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lugnet.cad.ray, lugnet.cad
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Date:
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Sat, 7 Apr 2007 22:18:16 GMT
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Viewed:
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1341 times
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In lugnet.cad.ray, James Reynolds wrote:
> Does anyone know how to generate an inverse matrix. By inverse I mean it will
> undo the rotation of the original matrix. I thought the inverse of
> <1,0,0,0,1,0,0,0,1,0,0,0> was <-1,0,0,0,-1,0,0,0,-1,0,0,0>. In other words,
> multiply every value by -1.
>
> I know POV-Ray 3.6 has an inverse matrix function but it doesn't work in 3.1,
> which is what I'm using.
There really is no easy way to do it. Feel free to look at
TCVector::invertMatrix in the LDView code if you want to see code that does it
on a 4x4 matrix. To convert a 3x3 matrix into a 4x4 matrix, put the 3x3 in the
top left, put a 1 in the bottom right, and fill in the other empty cells with 0.
--Travis
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Message has 1 Reply:
Message is in Reply To:
 | | Inverse matrix?
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| Does anyone know how to generate an inverse matrix. By inverse I mean it will undo the rotation of the original matrix. I thought the inverse of <1,0,0,0,1,0,0,0,1,0,0,0> was <-1,0,0,0,-1,0,0,0,-1,0,0,0>. In other words, multiply every value by -1. (...) (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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