[vtkusers] how can i clip the vtkImageData using the vtkPolyData? thank you in advance~

[Ye Jun]

hi, everyone. i want to clip the vtkImageData using the self-created
vtkPolyData. i want to get the vtkImageData as result. but i find that there
is only a class named vtkClipVolume to clip the imagedata, but its output is
vtkUnstructuredGrid which is not what i expected. what can i do to get the
result imagedata? Any advice is  required~ thank you in advance.
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