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arXiv cs/0110030cs.CGcs.DM
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稠密点集具有稀疏的德洛内三角剖分

Dense point sets have sparse Delaunay triangulations

Jeff Erickson

摘要:

有限点集的扩展是最长和最短成对距离之间的比率。证明了R^3中任意n点集的德洛内三角剖分的复杂性为O(D^3).对于所有D = O(sqrt{n}),这个界在最坏情况下是紧的。特别地,任何稠密点集的德洛内三角剖分都具有线性复杂性.我们还推广这个上界的球,工会的几个密集的点集,和均匀的光滑表面的样本的k层系统的定期三角剖分。另一方面,对于任意n和D=O(n),我们构造了一个复杂度为Omega(nD)的正则三角剖分,其n个顶点扩展了D。

英文摘要:

The spread of a finite set of points is the ratio between the longest and shortest pairwise distances. We prove that the Delaunay triangulation of any set of n points in R^3 with spread D has complexity O(D^3). This bound is tight in the worst case for all D = O(sqrt{n}). In particular, the Delaunay triangulation of any dense point set has linear complexity. We also generalize this upper bound to regular triangulations of k-ply systems of balls, unions of several dense point sets, and uniform samples of smooth surfaces. On the other hand, for any n and D=O(n), we construct a regular triangulation of complexity Omega(nD) whose n vertices have spread D.

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