[vtkusers] Rotation does not happen about the center of the image

[Anja Ende]

Hi everyone,

I am unsable to have the rotations at the center of the image.

So, I have a 3D volume and I pass it through the vtkImageChangeInformation
filter. The CenterImageOn() function si called.

The output of this filter is passed to a vtkImageReslice which has a
transformation object that does the scaling and rotation. The scaling works
fine but when I rotate the image I can see the center being shifyted. I
thought that the vtkTransform should do these operations around the image
center.

I printed the vtkImageReslice index matrix and the original matrix is:

Elements:
 1 0 0 0
 0 1 0 0
 0 0 1 62
 0 0 0 1

And after a rotation of one degree:

0.999848        -0.0174524 0            0.0776696
0.0174524       0.999848 0              -4.44969
  0 0 1 62
  0 0 0 1

I was hoping that the center would remain stationary....

If anyone can cast some light on how I can manage this, I would be really
grateful.

Thanks,
Anja
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060918/f9f0634d/attachment.htm>