19.1.2
CGAL
The Computational Geometry Algorithms Library or CGAL provides efficient and
reliable geometric algorithms in C++. It is extremely comprehensive, offering a rich
variety of triangulations, Voronoi diagrams, operations on polygons and polyhedra,
line/curve arrangements, alpha-shapes, convex-hull algorithms, geometric search
structures, and more. Many work in three dimensions and some beyond.
CGAL (www.cgal.org) should be the first place to go for serious geometric com-
puting, although you should expect to spend some start-up time getting oriented
to the CGAL way of thinking. CGAL is distributed under a dual-license scheme.
It can be used together with open source software free of charge but using CGAL
in other contexts requires obtaining a commercial license.
1 9 . 1
S O F T W A R E S Y S T E M S
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