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This is a port of Jonathan Shewchuk's Triangle library to R. From his description: "Triangle generates exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations, Voronoi diagrams, and highquality triangular meshes. The latter can be generated with no small or large angles, and are thus suitable for finite element analysis."
Package details 


Author  Jonathan Richard Shewchuk [ctb, cph], David C. Sterratt [cph, aut, cre], Elias Pipping [ctb] 
Maintainer  David C. Sterratt <[email protected]> 
License  CC BYNCSA 4.0 
Version  1.60.10 
URL  https://github.com/davidcsterratt/RTriangle http://www.cs.cmu.edu/~quake/triangle.html 
Package repository  View on CRAN 
Installation 
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