先挖坑，过了这段时间再把关键论文细节补上
单体约束，切割模拟，视频地址如下
http://v.youku.com/v_show/id_XMzkxOTMxMjE3Ng==.html?spm=a2hzp.8244740.0.0
双边约束，运动模拟，视频地址如下
http://v.youku.com/v_show/id_XMzg5MDIyMTg1Ng==.html?spm=a2hzp.8244740.0.0
