https://cgal.geometryfactory.com/CGAL/Members/wiki/Features/Small_Features/Remove_cluster https://cgal.geometryfactory.com/CGAL/Members/wiki/Features/Small_Features/Structural_filtering Merge also a partial support of: https://cgal.geometryfactory.com/CGAL/Members/wiki/Features/Small_Features/Rt::vertices_inside_conflict_zone (vertices_inside_conflict_zone" is added in Regular_triangulation_3, without documenting it)