...的集合．通常顶点的邻接形成开或闭的简单的多边形线，如果顶点的邻接 是开的多边形线，称这个顶点是边界顶点（Boundary vertex），否则是内顶点（Internal vertex）．一条边只属于一个面，称这条边为边界边（Boundary edge），否则称为内部边 （Interior edge...
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干的泡沫由多边形的泡泡组成，而底部湿泡沫则都是圆形气泡，因为普拉托边界和顶点都充满了液体。
Dry foams are made of polyhedral bubbles; wet foams, as seen near the bottom, have rounder bubbles because liquid has inflated the Plateau borders and vertices.
算法还结合临近边界点合并等原则，删除对表达场景几何特征重要度低的顶点。
To further improve the simplification, vicinity vertices on the border of the area are merged.
然后，判断每个矩形区域内的目标物边界是否包含手动选取的两个对角顶点，若不包含，则边界生长直至包含该对顶点；
At thes third step, for every rectangular, we check whether boundary include two apex which is selected at first step, if not included, then the boundary grow until that contains the apex.
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