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Automatic isotropic mesh size field

Arthur Bawin requested to merge octreeSizeField into master

Computes an isotropic mesh size field based on a uniform mesh of a CAD model. The size field is based on the curvature of the CAD surfaces and on their proximity to each other. The size field is stored in an octree, at the center of the cells. The octree has to be computed from a uniform mesh, and the loaded as a background mesh when meshing the geometry.

Requires the library p4est to use the octree routines.

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