[vtkusers] vtkClipVolume: Clip the whole volume or only its contour?

[Laurent Paul]

Hi users,

I have still some problem to clip a volume.
I don't really know if it works fine with Image data.
I have an ImageDataSet (almost 200 images) and I want to cut parts of my
volume with planes or sphere.
So I use vtkClipVolume. Then, I give the output to
vtkUnstructurdGridVolumeRayCastMapper but consumes a lot of memory. I
tried with only 3 images and after some time (about 20 secondes),
something appears in my 3D window. A big blue cube clipped with a plane.
I suppose the unstructuredGrid contains pixels outside of the patient (the
air) and that's why it is very time and memory consuming.

So how vtkClipVolume works?
Can I really clip a volume or do I have to contour the volume?
Please tell me how it really works, I think I'm using the clipper in a
poor way...

Can I use another way?
So far, I added the clipping plane to the mapper. It works but how to do
with a sphere??

Please I really need help, any advice about vtkClipVolume will be much
appreciated.

Thanks,

Laurent.