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蜜雪兰瑭

铜虫 (初入文坛)

[求助] 凹形的平面散乱点作出delaunay网格,怎样把外部多余的delaunay边去掉?急!

这是T形得平面散乱点,作出delaunay三角形后发现原本凹的地方出现了多余的三角形,用什么方法可以去掉?请给出算法,给出相关文献也行!各位大侠帮帮忙!

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acmuser

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小雨萌萌: 金币+2, 3Q~ 2012-05-16 18:58:43
引用回帖:
3楼: Originally posted by 蜜雪兰瑭 at 2012-05-14 23:26:28:
是呀,散乱点在T形内部和边界上都有点

I assume you know how to judge whether or not certain point is inside the T-shape polygon.

I believe there are algorithm to make sure that all the boundary segments are edges of triangles, for example, Matlab DelaunayTri has such options.

Then, if these requirements are satisfied, you can just compute the midpoint of edges, if it is outside the T-shaped polygon, then remove the edge, also the corresponding triangle.
4楼2012-05-14 23:37:56
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acmuser

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【答案】应助回帖


感谢参与,应助指数 +1
小雨萌萌: 金币+1, 谢谢应助~ 2012-05-16 18:58:27
The control points of the boundary of the T-shape polygon also belong to the set of scattered points, right?
2楼2012-05-14 19:15:44
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蜜雪兰瑭

铜虫 (初入文坛)

引用回帖:
2楼: Originally posted by acmuser at 2012-05-14 19:15:44:
The control points of the boundary of the T-shape polygon also belong to the set of scattered points, right?

是呀,散乱点在T形内部和边界上都有点
3楼2012-05-14 23:26:28
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蜜雪兰瑭

铜虫 (初入文坛)

引用回帖:
4楼: Originally posted by acmuser at 2012-05-14 23:37:56:
I assume you know how to judge whether or not certain point is inside the T-shape polygon.

I believe there are algorithm to make sure that all the boundary segments are edges of triangles, for  ...

关键是找不到方法判断内外,来去掉外部的,有什么方法吗?
5楼2012-05-15 11:40:28
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