Mac下运行的点云查看器，可以观看三维坐标点云，可以切割、拷贝点云。-Point cloud viewer running under Mac, you can watch a three-dimensional coordinate point cloud, you can cut, copy point cloud.

点云查看器，实现点云数据（.ply格式）的导入和导出、清除当前点云数据、显示每个点的法向、根据每个点法向对应的颜色值，赋予这个点颜色、对当前窗口截屏。(Point cloud viewer, to realize the import and export of point cloud data (.Ply format), to clear the current point cloud data, to display the normal of each point, to give th