[vtkusers] Placing vtkLineWidget at renderer window center

[manzohar]

I use a vtkInteractorStyleTrackballCamera interactor.When placing a new line
widget it will initially placed at the center of volume. If the center of
the volume is not within the renderer window ( panned and zoomed ) the line
widget is not seen ( using vtkInteractorStyleTrackballActor it is initially
placed at the center of the rendering window ) .  Is there a way to place it
initially at the center of the rendering window ?

Thanks zohar




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