[Sidefx-houdini-list] HDK : Matrix Inverse Problem

Mario Marengo mario at axyzfx.com
Fri Aug 1 12:07:25 EDT 2008


On Friday 01 August 2008 07:29:05 am Jaideep Khadilkar wrote:
> Hi.....
> My Matrix A is
>
> 1 0 0 0 0 1 0 0 0 0 -1 0 0 0 20 1
>
> I am using A.invert(B) to invert A and place the result in B.
>
> When I print B, it is same as A
>
> 1 0 0 0 0 1 0 0 0 0 -1 0 0 0 20 1
> Why I am not getting the right inverse???

I could be wrong, but I believe that's an orthogonal matrix (is that the right 
name for these? -> det=-1) and is its own inverse. In your case, A*A=I.
So you might actually be seeing its inverse... it just looks the same as the 
original.

-- 
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Mario Marengo                                  mailto:mario at axyzfx.com
AXYZ ANIMATION                                 http://www.axyzfx.com
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