[vtkusers] Pick, Pick, Pick

[Denny]

hi all
  I have a number of polygons in my data, and now I'm
trying to use vtkRenderWindowInterAtcor to pick one of
the polygons in my data but fail all the time.
In fact I don't know the exact process of picking an
object on the screen in vtk. So, I'm here to beg your
helps. Can anyone show me an example code on picking
object? or any detailed suggestion will be highly
appreciated.


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