It covers not only triangle normals around vertex but also other geometrical characteristic, such as triangle area to calculate cost of collapse, which efficiently simplifies mesh models.

• 该算法除了考虑顶点周围三角形的法向量外还考虑其他几何特征如三角形面积等来计算边的折叠代价，能够有效地对网格模型进行简化；