vtkRenderWindowInteractor *vrwi = bbGetInputRenderer()->GetRenderWindow()->GetInteractor();
vrwi->AddObserver( vtkCommand::EndPickEvent , callPicker );
vrwi->AddObserver( vtkCommand::StartPickEvent , callPicker );
vtkRenderWindowInteractor *vrwi = bbGetInputRenderer()->GetRenderWindow()->GetInteractor();
vrwi->AddObserver( vtkCommand::EndPickEvent , callPicker );
vrwi->AddObserver( vtkCommand::StartPickEvent , callPicker );