[Insight-users] Affine Inverse error?

[Bradley Lowekamp]

Emma,

The Offset and the Center are factored into the inverse. Have you tried transforming points to verify your conjecture?

Brad

On Jan 29, 2014, at 6:10 AM, Emma Saunders <emmasaunders123 at gmail.com> wrote:

> Hi am reading an affine transform and printing it's inverse to screen.  The original Translation  [5.66101, 14.0742, -5.731] and inverse Translation Translation: [-5.98632, -15.1146, 6.15185] appear different?  Is this a bug?
> 
> Thanks
> 
> Emma
> 
> Matrix: 
>     0.97688 -0.0114633 0.00221758 
>     0.0017227 0.931566 0.00265812 
>     -0.00067023 0.0265189 0.996092 
>   Offset: [5.66101, 14.0742, -5.731]
>   Center: [0, 0, 0]
>   Translation: [5.66101, 14.0742, -5.731]
> 
> Here is the inverse
> 
>  Matrix: 
>     1.02364 0.0126622 -0.0023127 
>     -0.00189508 1.07352 -0.00286052 
>     0.000739221 -0.0285717 1.004 
>   Offset: [-5.98632, -15.1146, 6.15185]
>   Center: [0, 0, 0]
>   Translation: [-5.98632, -15.1146, 6.15185]
> 
> 
> 
> 
> 
> 
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