// We will turn on our special effects when the platform is raising, but if it is moving side
  // to side, how fast does it have to be moving to cause our special effects to turn on?
  var horizontalSpeedToEnableEmitters = 1.0;
  
  // A true/false (boolean) variable to keep track of whether or not our special effects are
  // currently turned on.
  private var areEmittersOn : boolean;
  
  //  We are going to use these later to calculate the current velocity.
  private var oldPosition : Vector3;
  private var currentVelocity : Vector3;
  
  function Start() {
          // Grabs the initial position of the platform.
          oldPosition = transform.position;
  }
  
  function Update() {
           // Remember if our emitters were on, then we'll see if they are currently on.
          wereEmittersOn = areEmittersOn;
          
          // The emitters are on if the vertical (y) velocity is greater than 0 (positive), or if the
          // horizontal velocity in either direction (positive or negative speed) is greater than
          // our horizontalSpeedToEnableEmitters threshold.
          areEmittersOn = (currentVelocity.y > 0) || (Mathf.Abs(currentVelocity.x) > horizontalSpeedToEnableEmitters);
          
          // We only have to update the particle emitters if the state of them has changed.
          // This saves needless computation.
          if (wereEmittersOn != areEmittersOn) {
                  // Get every child ParticleEmitter in the moving platform.
                  for (var emitter in GetComponentsInChildren(ParticleEmitter)) {
                          //Simply set them to emit or not emit depending on the value of areEmittersOn
                          emitter.emit = areEmittersOn;
                  }
          }
  }
  
  function LateUpdate () {
          currentVelocity = transform.position - oldPosition;
          oldPosition = transform.position;
  }
  
  // This line tells Unity to nicely place this script in a submenu of the Component menu.
  @script AddComponentMenu("2D Platformer/Moving Platform/Moving Platform Effects")