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# Chapter 6
dD Convex Hulls and Delaunay Triangulations

Susan Hert and Michael Seel

A subset S 3 is convex if for any two points p and q in the set the line segment with endpoints p and q is contained in S. The convex hull of a set S is the smallest convex set containing S. The convex hull of a set of points P is a convex polytope with vertices in P. A point in P is an extreme point (with respect to P) if it is a vertex of the convex hull of P.

CGAL provides functions for computing convex hulls in two, three and arbitrary dimensions as well as functions for testing if a given set of points in is strongly convex or not. This chapter describes the class available for arbitrary dimensions and its companion class for computing the nearest and furthest side Delaunay triangulation.

### Concepts

ConvexHullTraits_d
DelaunayLiftedTraits_d
DelaunayTraits_d

### Classes

CGAL::Convex_hull_d_traits_3<R>
CGAL::Convex_hull_d<R>
CGAL::Delaunay_d< R, Lifted_R >

### Alphabetical Listing of Reference Pages

- ConvexHullTraits_d

- Convex_hull_d<R>

- Convex_hull_d_traits_3<R>

- DelaunayLiftedTraits_d

- DelaunayTraits_d

- Delaunay_d< R, Lifted_R >

Next chapter: Polygons and Polygon Operations

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The CGAL Project . Tue, December 21, 2004 .