PingPongs the value t, so that it is never larger than length and never smaller than 0.
The returned value will move back and forth between 0 and length.
JavaScripts
JavaScript
C#
Boo
functionUpdate () { // Set the x position to loop between 0 and 3 transform.position = Vector3( Mathf.PingPong(Time.time, 3), transform.position.y, transform.position.z); }