[vtkusers] Coordinates Of Vector that is perpendicular ( normal ) to the display

[manzohar]

How can I find the coordinates of unit vector ( its origin is given in X,Y
that are display coordinates ) the X,Y,Z of the origin in world coordinates
can be found by using the vtkInteractorObserver::ComputeWorldToDisplay ) 
that is perpendicular ( normal )  to the display

Thanks
Zohar




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