# 倒角距离 Chamfer Distance
**3D点云中的倒角距离**：
3D空间的倒角距离主要用于点云重建或者3D重建工作。定义如下：
以上公式的S1,S2分别表示两组3D点云
第一项代表S1中任意一点x到S2的最小距离之和 (S1任意点找S2中距离最近的点作为距离)\
第二项则表示S2 中任意一点y 到S1 的最小距离之和
如果该距离较大，则说明两组点云区别较大；如果距离较小，则说明重建效果较好。一般来说，该距离用作3D重建网络的损失函数。
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