How to set tolerance for vtkPropPicker

I want to pick actor in VTK.

Firstly, I use vtkCellPicker, but it do not work as expected. vtkCellPicker can not pick vtk.vtkActor - Support - VTK And I still don’t know why.

Then, I try vtkPropPicker, and it works fine. However, I need to be very careful to pick a line. And I can not find the SetTolerance method as in vtkCellPicker. How can I set tolerance for vtkPropPicker? Or is there any other picker which can pick actor/prop correctly and has the the SetTolerance method.

Any suggestion is appreciated!