geom3d的目的是处理和可视化的三维几何图元，如点，线，面，体…它操作3D几何图元提供了低级别的功能，更容易开发的更复杂的几何算法 -The aim of geom3d library is to handle and visualize 3D geometric primitives such as points, lines, planes, polyhedra... It provides low-level functions for manipulating 3D geometr