double edge_length_variation_cost(const Vertices vertices, int section);
double prop_edge_length_variation_cost(const Vertices vertices, int section);
double rim_proximity_cost(const Vertices vertices, int section);
+double rim_twist_cost(const Vertices vertices, int section);
double edge_angle_cost(const Vertices vertices, int section);
double small_triangles_cost(const Vertices vertices, int section);
double nonequilateral_triangles_cost(const Vertices vertices, int section);