Hackily handle avg_norm == 0

printrun/gl/libtatlin/actors.py

@@ -335,6 +335,9 @@ class GcodeModel(Model):
                         avg_move = move_normalized / 2 + prev_move / 2
                         norm = numpy.linalg.norm(avg_move)
                         # FIXME: handle norm == 0 or when paths go back (add an extra cap ?)
+                        if norm == 0:
+                            avg_move_normal = move_normal
+                        else:
                             avg_move = avg_move / norm
                             avg_move_normal = numpy.array([- avg_move[1], avg_move[0]])
                         # Compute vertices