slicing volumes

[Dr Tian-Qing Ye]

Hi 

I am using vtkExtractVOI to get the slices out of a volume.
What's the difference between vtkExtractVOI and vtkImageClip?

Tianqing
 
David Gobbi wrote:
> 
> Hi John,
> 
> It's definitely vtkImageClip that you want to use here.  There
> is virually zero overhead involved in using a vtkImageClip
> to extract an image slice.
> 
> You might find that VTK is more sluggish working with X
> slices than with Y or Z slices.  There is no easy way around
> this.  When you extract an X slice, the filter (or imager)
> immediately after vtkImageClip has to deal with highly
> discontiguous data.
> 
>  - David
> 
> --David Gobbi, MSc                    dgobbi at irus.rri.on.ca
>   Advanced Imaging Research Group
>   Robarts Research Institute, University of Western Ontario
> 
> On Mon, 23 Aug 1999, John Biddiscombe wrote:
> 
> > Dear All,
> >
> > To slice a volume along the axes with no resamplig or interpolation, just a
> > simple extraction of slices, should one
> >
> > vtkImageReslice (seems a bit overkill)
> > SP->GeometryFilter (don't want polygons output)
> > vtkImageClip (I think I want this one)
> >
> > is ImageClip the one I want or are there others that will do the job.
> >
> > Thanks
> >
> > John B
> >
> >
> >
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