[vtkusers] Question about Pick

[杨清云]

Hi,

When I use fuction pick( ) of vtkPointPicker, I have found one question that
the result of GetPickPosition is not the same with the result in the pick( )
fuction.

this->PickedPositions->InsertNextPoint
              ((1.0 - t)*p1World[0] + t*p2World[0],
               (1.0 - t)*p1World[1] + t*p2World[1],
               (1.0 - t)*p1World[2] + t*p2World[2]);

How does this happen? Thanks!
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