学习java时写的点云和3维线段的3D显示，算法是自己用初中知识写的所以性能不咋的，编码不规范，有一点bug。我需要上传这个来开通帐号，就给大家看看(Learning java when writing point cloud and 3 dimensional line segment 3D shows that the algorithm is written by junior high school knowledge, so the performance is not good, t