[vtkusers] Modify extent of vtkImageClip output

[Jothybasu Selvaraj]

Hi,

I am using vtkImageClip to clip the vtkImageData to selcet the required
volume of interest (VOI).

But I am always getting the extent of the vtkImaegClip as the original one.

How can I make the vtkImageClips's output's exten to reflect the new
extents.

For instance, after clipping the extent are from (20,60,30,70,10,30). I
want it to be (0,40,0,40,0,20).

There is no method either in vtkImageChangeInformation to do this.

I tried vtkImageClip::ClipDataOn() and OFF().


I alos tried vtkImageReslice, with setOutputExtent() and the corresponding
SetOutputorigin().

The results are same!

Any hints?

Thanks

-- 
Jothy
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