to select point clouds by PolytopeIntersector

[zhuzhiyong8679]

https://github.com/zhuzhiyong8679/vsg_polytope.git Due to the lack of polyhedron intersection to select the point cloud, the polyhedron class was written in an emergency. At present, there is a lack of triangulation and lines, and for a novice like me, there is still a lack of relevant mathematical knowledge. Doing..