[vtkusers] How to get the coordinate in the volume data by mouse click?

[Guotai Wang]

Hello,
    I have a volume data(3D medical image) and visualize one slice by VTK, I
want to edit that slice by user interaction, i.e., the user can click
certain point in the render window, and the corrdinate of of the
corresponding pixel in the volume data can be calculated and then the pixel
value can be edited. But how to get the corresponding coordinate of the
pixel by mouse click?
   



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