[vtkusers] Display model coordinate with vtkImagePlaneWidget

[Xianjin Yang]

Hi vtkusers,

I found that vtkImagePlaneWidget is very useful for slicing an image data
set. The cursor data enabled by vtkCellPicker shows the CELL-coordinate, but
I really want to see my model cartesian (X, Y, Z) in the model coordinate
system. The cell coordinate is mesh (grid) size dependent and gives a
relative location only. Is there any way to display the model coordinate
while clicking the left mouse button? Thank you for your help.

Yang
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