Joint origin: a circle given by its centre (#393) (#1686)

Thanks @SychPL.

crates/kernel/src/lib.rs

@@ -181,7 +181,7 @@ pub use surfaces::{
     sweep_sheet_points, sweep_sheet_points_with, sweep_sheet_with, thicken, trim, unstitch,
 };
 pub use sweep_path::{SweepControl, SweepOrientation, sweep_path, sweep_path_with};
-pub use topo::{CylinderFace, cylinder_face_at};
+pub use topo::{CylinderFace, cylinder_end_at, cylinder_face_at};
 pub use topo::{TopoCounts, merged_topology, seam_flags};
 pub use tspline::tspline_sheet;