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 23:33:00 GMT
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Viewed:
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6890 times
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On Apr 7, 2007, at 10:18 PM, Travis Cobbs wrote:
> 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
Hehehe, cool, I'll try that. Thanks!
James
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Message is in Reply To:
 | | Re: Inverse matrix?
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| (...) 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 (...) (18 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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