rb_manifold_filter_backface( man, len );
rb_manifold_filter_joint_edges( man, len, 0.03f );
rb_manifold_filter_pairs( man, len, 0.03f );
rb_manifold_filter_backface( man, len );
rb_manifold_filter_joint_edges( man, len, 0.03f );
rb_manifold_filter_pairs( man, len, 0.03f );