libgeometry 
Downloads: Source Code (Visual Studio 2008 SP1, C++) [Zip]
Details 
libgeometry is a computer graphics software library, which implements a wide range of graphics capabilities, primarily focusing on 3D mesh processing. For some examples of what has been done with libgeometry, see DragDropTool, CloneTool, and SegTool. Other people have successfully used libgeometry in their projects, so despite minimal documentation, it can't be that hard.... libgeometry includes the following capabilities/components (some of these are class names, others just rough categories):
libgeometry is built on top of the WildMagic4 Foundation library, which is included in the source distribution. WildMagic4 Foundation is a fullyfeatured math library developed by Dave Eberly at GeometricTools.com. It includes too many capabilities list in detail, but the core components include vector math, geometric primitives, various curve/surface/mesh representations, intersection and distance tests, containment and approximatefitting computations, various types of numerical solvers, many interpolation schemes, and some computational geometry like convex hull and delaunay algorithms. All code is double/float templated, and most things are provided for both 2D and 3D. I use WildMagic for just about everything, and so should you. (Note that WildMagic5 is available, but the basic math library is largely unchanged save for some bug fixes. The library structure changed though, so it takes an afternoon to do the port.) Build Instructions To build libgeometry you will need to follow three steps:
Note that precompiled static libraries from my GSI solver package are included. These are built for Visual Studio 2008 SP1 and are unlikely to work with other versions (but they might  who knows!). You could build libgeometry on OSX or linux without too much effort. There is no platformdependent code, save for in WildMagic (which includes OSX xcodeproj and linux makefiles). However you would need to deal with the GSI solver dependency (which is also much easier in unix/posix environments than in windows). Known Bugs Too many to list. This is research software. It is not robust or efficient. Good luck! Licenses This majority of this code is released under the Boost 1.0 License, so you can use it for any purpose, commercial or noncommercial. However, some of the code is taken from other sources and you will need to respect their individual licenses: The subdirectory libgeometry\WildMagic4 is taken from the WildMagic library (version 4) developed and distributed by Dave Eberly at GeometricTools.com. WildMagic contains, quite simply, the best lowlevel math library ever, and you should use it for everything. It is similarly under the Boost 1.0 License. The subdirectory libgeometry\external\eigen contains the Eigen 3 distribution, a C++ headersonly math library. Eigen may be used under the LGPL3 or GPL3 licenses (FAQ). The subdirectory libgeometry\external\SparseMatrix contains precompiled libraries that themselves contain compiled versions of many other math libraries, including LAPACK, BLAS, TAUCS, METIS, UMFPACK, and more. Please see the GSI page for details. The file libgeometry\mesh_processing\Triangulator2D.cpp contains the source code to the TRIANGLE software, copyright Jonathan Richard Shewchuk. This code may not be used in commercial products without permission from the copyright owner. Please contact him, not me. If you want to reference TRIANGLE, here is a citation: Jonathan Richard Shewchuk, Triangle: Engineering a 2D Quality Mesh Generator and Delaunay Triangulator, in ``Applied Computational Geometry: Towards Geometric Engineering'' (Ming C. Lin and Dinesh Manocha, editors), volume 1148 of Lecture Notes in Computer Science, pages 203222, SpringerVerlag, Berlin, May 1996. (From the First ACM Workshop on Applied Computational Geometry.) [PostScript] [HTML].

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