Preface: In the interactive operation of vtk, it is often necessary to obtain the world coordinate system of the interaction point. This blog post mainly describes how to obtain the world coordinate system of the interaction point in several cases, and the difference between the two.
The main interfaces involved in this blog post are vtkCellPicker, vtkPointPlacer and so on.
Table of contents
1. Get the world coordinate system of the interaction point on the object (