Bug in sliceOrder?

[Ana Cugat]

<x-flowed>Sorry to insist, but I have some doubts about the SliceOrder.tcl script. 
Actually, it should change the orientation of a volume without going through 
any flipping even if we mistake the transform we must choose (so we won't 
obtain the desired orientation but there won't be any flipped axis), isn't 
it?

Don't the is (inferior to superior) and the lr (left to right) transforms 
result in x-axis flipping?

Thanks,
Ana


>From: Eric Wies <Eric.Wies at loria.fr>
>CC: vtkusers at gsao.med.ge.com
>Subject: Re: Bug in sliceOrder?
>Date: Wed, 20 Oct 1999 16:27:38 +0200
>
>Ana Cugat wrote:
> >
> > I'm using the sliceOrder.tcl source that we can find in the
> > ~vtk/graphics/examplesTcl/frog directory to get always the same 
>orientation.
> >
> > Isnt' there a bug in the is (inferior to superior) transform?
> > the transform is at follows:
> >
> > 1  0  0  0
> > 0  0 -1  0
> > 0 -1  0  0
> > 0  0  0  1
> >
> > so it flips the image.. shouldn't it be?
> >
> >-1  0  0  0
> > 0  0 -1  0
> > 0 -1  0  0
> > 0  0  0  1
> >
> > Thanks,
> >
> > Ana
> >
> > ______________________________________________________
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> >
> >
>
>Hello, i've got the same problem, Matrix must be inverted before using.
>Does anyone use vtkMatrix4x4 and vtkTransform::SetMatrix ?
>
>If i invert Matrix the picture is corect, else the translation and
>rotations are oposite, i don't know if i made a mistake but if i
>understand the using of matrix, the coordinate are compute by
>premultiply (Matrix * Point). So what's wrong ?
>
>Thanks for answers
>--
>
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>------------------------------------------------------------------
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</x-flowed>