基于质点-弹簧模型的曲面准对称化展开算法展开三角化曲面；
Surfaces are flattened with quasi-symmetrically distributed triangle strips based on a mass-spring model.
基于双向映射的曲面层次网格化展开算法展开高度复杂的三角化曲面。
High complex surfaces are flattened with hierarchy meshes based on bi-mapping.
三角化曲面上的网格顶点和网格边被抽象为质点-弹簧模型，用来控制网格形状。
Vertices and edges on the triangulated surface are abstracted into a mass-spring model which is used to control the shape of triangles.
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