标签：
- Since we perform elimination after every step of subdivision, the only hanging nodes that we encounter
are those where the level of subdivision differs by 1.
- http://www.flipcode.com/archives/The_Half-Edge_Data_Structure.shtml
Notes on view-dependent Catmull-Clark subdivision surfaces
标签：
原文地址：http://www.cnblogs.com/len3d/p/4298127.html
