VTK--vtkCellPicker selects the line segment/point method

Preface: When vtkCellPicker is used to directly select Line or PolyLine in vtk, the object obtained through GetActor() is empty. This blog post introduces a new way to select polylines - vtkPickerManager.

Table of contents

1. Create a new vtkCellPicker object

2. Add candidates

3. Add vtkCellPicker object to vtkPickerManager