[vtkusers] vtkPicker returned actor

[Lonni Besançon]

The spacing is 1 along the three axis.
The origin is -51,-46,0.

GetMapperPosition is always between -0.5 and 0.5 and therefore the
computation I make afterwards as you suggested with the resliceAxesMatrix is
always comprised between 50.5 and 51.5 for the X axis, and 46.5 and 47.5 for
the y axis.



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