vtkRenderWindowInteractor *iren = static_cast<vtkRenderWindowInteractor*>(caller);
int* pos = iren->GetEventPosition();
vtkCellPicker *picker = vtkCellPicker::New();
vtkRenderWindowInteractor *iren = static_cast<vtkRenderWindowInteractor*>(caller);
int* pos = iren->GetEventPosition();
vtkCellPicker *picker = vtkCellPicker::New();