[vtkusers] How to extract pixel data that rests after clipping?

[秋云杰]

Hi,

I have finished volume rendering with some images,and have clipped it with
AddClippingPlane().  The result of clipping could be seen in the render
window.  But I cannot extract the pixel data that rests after clipping. Is
there some functions can implement that?

Thanks and Regards,
Jin Le
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