cdt_edges               Unique edges of a triangulation
cdt_interpolate         Interpolate per-vertex attributes onto points
cdt_pslg                Triangulate an RTriangle pslg with the CDT
                        backend
cdt_triangulate         Constrained Delaunay triangulation with
                        refinement (CDT backend)
cdt_triangulate_attr    Triangulate with per-vertex attributes carried
                        onto new vertices
default_min_edge_length
                        Default refinement edge-length floor
