---
title: Nice point sets can have nasty Delaunay triangulations
url: https://www.emergentmind.com/papers/0103017
type: paper
arxiv_id: '0103017'
arxiv_url: https://arxiv.org/abs/0103017
published: '2001-03-23'
categories:
- cs.CG
---

# Nice point sets can have nasty Delaunay triangulations

## Abstract

We consider the complexity of Delaunay triangulations of sets of points in R^3 under certain practical geometric constraints. The spread of a set of points is the ratio between the longest and shortest pairwise distances. We show that in the worst case, the Delaunay triangulation of n points in R^3 with spread D has complexity Omega(min{D^3, nD, n^2}) and O(min{D^4, n^2}). For the case D = Theta(sqrt{n}), our lower bound construction consists of a uniform sample of a smooth convex surface with bounded curvature. We also construct a family of smooth connected surfaces such that the Delaunay triangulation of any good point sample has near-quadratic complexity.