diff -r 29859ffd0ac1 -r 334fd47c482e src/cube.rs
--- a/src/cube.rs	Wed Nov 06 22:27:35 2024 -0500
+++ b/src/cube.rs	Thu Nov 07 12:02:24 2024 -0500
@@ -303,16 +303,18 @@
     fn exp(self, tangent : &Self::Tangent) -> Self {
         let mut face = self.face;
         let mut point = self.point;
-        let mut dest = self.point + tangent;
-        loop {
+        let mut tan = *tangent;
+        let dest = loop {
+            let dest = point + tan;
             let (next_face, cross) = face.find_crossing(&point, &dest);
             if next_face == face {
-                break
+                break dest
             }
+            tan -= cross-point;
             point = next_face.convert_adjacent(face, &cross).unwrap();
-            dest = next_face.convert_adjacent(face, &dest).unwrap();
+            //dest = next_face.convert_adjacent(face, &dest).unwrap();
             face = next_face;
-        }
+        };
         OnCube { face, point : dest }
     }