[vtkusers] How can i get the intersection space as sub-volume

[Ting]

Hi,VTKUsers,
-- 
     I reconstruct a vtkVolume from MR/CT series DICOM images, and have a
3D closed surface defined as vtkActor constructed from vtkPolyData, the
vtkVolume and the vtkActor surface have intersection space. How can i get
the intersection space as sub-volume?
-- 
Best Wishes!
ouyting
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