slicing volumes

[David Gobbi]

On Tue, 24 Aug 1999, Dr Tian-Qing Ye wrote:

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

One is part of the graphics pipeline, while the other is part
of the imaging pipeline.  Both should provide the same result.

 - David
  
> 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
> > >
> > >
> > >
> > > -----------------------------------------------------------------------------
> > > This is the private VTK discussion list.  Please keep messages on-topic.
> > > Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
> > > To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
> > > <majordomo at gsao.med.ge.com>.  For help, send message body containing
> > > "info vtkusers" to the same address.     Live long and prosper.
> > > -----------------------------------------------------------------------------
> > >
> > 
> > -----------------------------------------------------------------------------
> > This is the private VTK discussion list.  Please keep messages on-topic.
> > Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
> > To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
> > <majordomo at gsao.med.ge.com>.  For help, send message body containing
> > "info vtkusers" to the same address.     Live long and prosper.
> > -----------------------------------------------------------------------------
> 
> 
> -----------------------------------------------------------------------------
> This is the private VTK discussion list.  Please keep messages on-topic.
> Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
> To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
> <majordomo at gsao.med.ge.com>.  For help, send message body containing
> "info vtkusers" to the same address.     Live long and prosper.
> -----------------------------------------------------------------------------
> 




-----------------------------------------------------------------------------
This is the private VTK discussion list.  Please keep messages on-topic.
Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
<majordomo at gsao.med.ge.com>.  For help, send message body containing
"info vtkusers" to the same address.     Live long and prosper.
-----------------------------------------------------------------------------