Geometric Traits Class for Projections

The classes CGAL_Triangulation_euclidean_traits_xy_2<R> is a geometric traits class allowing to build a two dimensional triangulation of the projections on the $xy$ plane of three dimensional points. This is the usual case when dealing with GIS terrains. Instead of really projecting the 3D points and maintaining a map between them (which costs space and is error prone) this class supplies geometric predicates that ignore the z-coordinate of the points.

#include <CGAL/Triangulation_euclidean_traits_xy_3.h>

Types

typedef CGAL_Point_3<R>
	Point;
typedef CGAL_Segment_3<R>
	Segment;
typedef CGAL_Triangle_3<R>
	Triangle;