The concept of relative density is presented at the first time to control the borderline separatingand to control the mesh density of the whole area further.
本文提出“相对密度”的概念控制区域边界线段的离散，进而控制整个区域的网格密度；
It is characterized with well defined boundary, good shape, easy control of mesh density and high level of automation, and suit for polygons with any shape.
具有边界清晰、单元形状好、网格密度可控和自动程度高的特点，适合于任意形状的凹或凸多边形。
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