[vtkusers] Get the point position in the coordinate before reslicing.

[superzz]

vtkImageReslice can present resliced images to GUI very well when
AutoCropOutput is turned on. However, when user click a point(x1,y1,z1) in
the resliced image, how to know its position (x0,y0,z0) in the coordinate
before reslicing?

I've tried different pickers but its seems that none of them works.

Thanks

zlf
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