[vtkusers] How to Isolate a 3D region in a volume using a vtkSphere or vtkCylinder?

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Hello everyone,

I have rendered a 3d volume(isoSurface) from a set of BMP files,now I
want to Isolate a 3D region in this volume using a vtkSphere or
vtkCylinder. How can I do this?

Can any one give me a suggestion?

Thanks a lot.