ImageReslice in vtk23

[Ana Cugat]

Thank you very much David,

If I set OptimizationOff it works.

The second method does not work, I get the same bizarre thing.

I don't quite understand why it worked before anyway. By the way, the 
OutputExtent actualizes on its own  (if it was 0 127 0 127 1 90 then the new 
outputextent is 0 127 1 90 0 127), but the outputorigin gives a strange 
result (goes from 0 0 0 to -3.8147e-06 -0.499996 -0.5 ). What is its meaning 
and must it be modified?

Thanks again,

Ana



>From: David Gobbi <dgobbi at irus.rri.on.ca>
>To: Ana Cugat <c1f6326 at hotmail.com>
>CC: vtkusers at gsao.med.ge.com
>Subject: Re: ImageReslice in vtk23
>Date: Wed, 7 Jul 1999 15:03:48 -0400 (EDT)
>
>Hi Ana,
>
>If this is the bug I think it is, it was fixed a while ago -- but
>probably after vtk2.3 was released.
>
>There are two ways to fix this.  First, try using the OptimizationOff()
>flag on vtkImageReslice (though this will cause the filter to run
>around 50% slower).
>
>The second method:  Instead of doing a rotation by approximately -90
>degrees
>
>   vtkTransform transform
>     transform RotateY -90.0
>
>build a permutation matrix that rotates by exactly -90 degrees
>
>   vtkMatrix4x4 matrix
>     matrix SetElement 0 0  0.0
>     matrix SetElement 0 2 -1.0
>     matrix SetElement 2 2  0.0
>     matrix SetElement 2 0  1.0
>
>   vtkTransform transform
>     transform Concatenate matrix
>
>This should solve your problem, if not, email me back.
>
>Thanks for the bug report.
>
>  - David
>
>--David Gobbi, MSc                    dgobbi at irus.rri.on.ca
>   Advanced Imaging Research Group
>   Robarts Research Institute, University of Western Ontario
>
>On Wed, 7 Jul 1999, Ana Cugat wrote:
>
> > I would like to know if there is any problem with vtkImageReslice. I 
>used
> > with vtk22 and I had no problem, but the same application running with 
>vtk23
> > produces strange results!!!
> >
> > If I do:
> >
> > vtkTransform transform
> > transform Identity
> > transform RotateY -90.0
> >
> > vtkImageReslice reslice
> > reslice SetResliceTransform transform
> > reslice SetInput [reader GetOutput]
> >
> >
> > it doesn't work while it worked with vtk22. I think has to do with
> > SetOutputExtent, but I didn't use it with vtk22 and it worked??!
> >
> >
> >
> >
> >
> > Ana Cugat
> >
> >
> > ______________________________________________________
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> >
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