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按点－ 线－ 面的层次数据结构，选取几种有代表性的曲线曲面，实现了三维复杂外形的表面描述。采用曲面到平面的保形变换，在平面内由阵面推进法自动生成三角形网格，实现了三维复杂外形的表面三角形网格自动生成
By point - line - surface level data structure, select several representative curves and surfaces to achieve a three-dimensional complex surface description of the shape. Using surface-to-plane conformal transformation, a triangular mesh is automatically generated in the plane by the matrix advancement method, and a surface triangular mesh with a three-dimensional complex appearance is automatically generated