[vtkusers] Clip Volume using freehand 2D Curve ROI

[longbowzhang]

"freehand 2D curve": I think vtkImageTracerWidget will do the job.
Together with vtkPolyDataToImageStencil, it is likely that you will get a
stencil, which could be employed to clip the 3D volume.

I am not sure whether this will finally work or not. But give it a try.





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