Poly2Tri is a sweepline constrained Delaunay Polygon Triangulation Library.
Used in Qt 3D.
The sources can be found in qt/qt3d/src/3rdparty/assimp/contrib/poly2tri.
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Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors
BSD 3-clause "New" or "Revised" License.