[vtkusers] picking from resliced output

[Greg Book]

I'm manipulating a 3D volume using the vtkImagePlaneWidgets and am
displaying the resliced output as a separate image. It seems if I do picking
the new image, it doesn't correctly pick points based on the original 3D
coordinates, instead it uses the new 2D coordinates.
How can I pick 3D points from a 2D resliced image?
-Greg
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