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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 in 2D and 3D, periodic triangulations in 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.
License
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.
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News
- December 19, 2009
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Attend a Course on CGAL at SIGGRAPH ASIA 2009, Yokohama, Japan.
- November 4-6, 2009
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Attend a CGAL demo session at the 17th ACM
SIGSPATIAL, Seattle, Washington.
- October 5, 2009
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CGAL-3.5 is released.
Check the changes,
the manual,
and download!
- September 25 and 27, 2009
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Attend a CGAL demo session on Point Set Processing and Surface Reconstruction at ACCV2009, Xi'an, China.
- August 4-6, 2009
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Visit the CGAL booth at SIGGRAPH 2009, New Orleans.
- March 10, 2009
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The new Matlab 2009a now uses CGAL triangulations. Watch the video.
- January 22, 2009
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CGAL-3.4 is released.
- January 12, 2009
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A CGAL users group has been created on the LinkedIn social network.
Older news and announcements
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