Computational Geometry Algorithms Library

The goal of the CGAL Open Source Project is to provide easy access to efficient and reliable geometric algorithms in the form of a C++ library. CGAL is used in various areas needing geometric computation, such as: computer graphics, scientific visualization, computer aided design and modeling, geographic information systems, molecular biology, medical imaging, robotics and motion planning, mesh generation, numerical methods... More on the projects using CGAL web page.

The Computational Geometry Algorithms Library (CGAL), offers data structures and algorithms like triangulations (2D constrained triangulations, and Delaunay triangulations and periodic triangulations in 2D and 3D), Voronoi diagrams (for 2D and 3D points, 2D additively weighted Voronoi diagrams, and segment Voronoi diagrams), polygons (Boolean operations, offsets, straight skeleton), polyhedra (Boolean operations), arrangements of curves and their applications (2D and 3D envelopes, Minkowski sums), mesh generation (2D Delaunay mesh generation and 3D surface and volume mesh generation, skin surfaces), geometry processing (surface mesh simplification, subdivision and parameterization, as well as estimation of local differential properties, and approximation of ridges and umbilics), alpha shapes, convex hull algorithms (in 2D, 3D and dD), search structures (kd trees for nearest neighbor search, and range and segment trees), interpolation (natural neighbor interpolation and placement of streamlines), shape analysis, fitting, and distances (smallest enclosing sphere of points or spheres, smallest enclosing ellipsoid of points, principal component analysis), and kinetic data structures.

All these data structures and algorithms operate on geometric objects like points and segments, and perform geometric tests on them. These objects and predicates are regrouped in CGAL Kernels.

Finally, the Support Library offers geometric object generators and spatial sorting functions, as well as a matrix search framework and a solver for linear and quadratic programs. It further offers interfaces to third party software such as the GUI libraries Qt, Geomview, and the Boost Graph Library.


CGAL is distributed under a dual-license scheme. CGAL can be used together with Open Source software free of charge. Using CGAL in other contexts can be done by obtaining a commercial license from GeometryFactory. For more details see the License page.


Feb 20, 2015
CGAL-4.6-beta1 is released. This is a testing release, that should not be used in production. Check the changes for details, the manual, and download!
Feb 13, 2015
CGAL-4.5.2 is released. That is a bug-fix release. Please download it!
Dec 22, 2014
CGAL-4.5.1 is released. That is a bug-fix release. Please download it!
Oct 10, 2014
CGAL-4.5 is released. Check the changes for details, the manual, and download!
Aug 12-14, 2014
Visit the CGAL Project on Booth No. 618 at the exhibition of Siggraph 2014, Vancouver Canada, 12-14 August 2014.
May 24, 2013
The CGAL project welcomes 7 GSoC students. Have a look at the Accepted Projects page.
April 4, 2014
CGAL-4.4 is released. Check the changes for details, the manual, and download!
April 01, 2014
The CGAL Project participates in Google Grass.
February 24, 2014
The CGAL Project is a mentoring organization for Google Summer of Code 2014. Have a look at our Project Ideas page.

Older news and announcements...