17. The apparatus of claim 11 , wherein the selectable position comprises any of starting the path, looping the path, changing direction of the path, changing velocity of the path, pausing motion in the path, or ending the path.
17. The apparatus of claim 11 , wherein the selectable position comprises any of starting the path, looping the path, changing direction of the path, changing velocity of the path, pausing motion in the path, or ending the path. 18. The apparatus of claim 17 , wherein the selectable position of changing direction comprises any of a curve having an estimated radius that is less than a threshold geometry, a comparison of the path direction before and after a curve, a sharp cusp edge in the path, or a comparison of path direction before and after a cusp.