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多边形网格

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一个用三角形网格表示的海豚

多边形网格Polygon mesh)是三维计算机图形学中表示多面体形状的顶点与多边形的集合,它也叫作非结构网格

这些网格通常由三角形四边形或者其它的简单凸多边形组成,这样可以简化渲染过程。但是,网格也可以包括带有空洞的普通多边形组成的物体。

非结构网格内部表示的例子有:

  • 一组顶点的简单列表,它们带有表示那些顶点组成多边形的信息列表;另外可能带有表示空洞的附加信息。
  • 顶点列表 + 边界列表(一对索引信息)+ 连接边界的多边形列表
  • 翼边数据结构

根据应用程序的不同所选择的数据结构也有所不同:三角形的处理要比普通多边形的处理更加简单,尤其是在计算几何中更是这样。对于优化的算法,可能需要快速访问边线或者相邻表面这样的拓扑信息,这样就需要如翼边表示这样更加复杂的结构。

参见

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多边形网格
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