alpha_shape_test

求解带洞平面点云的轮廓，使用滚球法。此办法速度较慢。参考博文： https://blog.csdn.net/Mahabharata_/article/details/78130511?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0.topblog&spm=1001.2101.3001.4242.1&utm_relevant_index=3 https://blog.csdn.net/zjjsd195/article/details/122390210