AutoWalk Oculus Rift

Hi: I0m new with Oculus Rift, I have made some games with Google Cardboard, and I have found an script for moving my character when he looks down with de headset, I'm trying to do the same thing in Oculus, when I look down I can star walking forward. Can anyone help me? I made this script but didn't work when I tried it with the Oculus DK2. Thanks for your help.

ublic class AutoWalk : MonoBehaviour {

 private const int RIGHT_ANGLE = 90;

 // This variable determinates if the player will move or not 
 private bool isWalking = false;

 Camera head;

 
 public float speed;
 public bool walkWhenLookDown;
 public double thresholdAngle;

 
 public bool freezeYPosition;

 public float yOffset;

 void Start() {

     head = gameObject.GetComponent<Camera>();
 }

 void Update()
 {
    

     // Walk when player looks below the threshold angle 
     if (walkWhenLookDown && !isWalking && head.transform.eulerAngles.x >= thresholdAngle && head.transform.eulerAngles.x <= RIGHT_ANGLE)
     {
         isWalking = true;
     }
     else if (walkWhenLookDown && isWalking &&
              (head.transform.eulerAngles.x <= thresholdAngle ||
              head.transform.eulerAngles.x >= RIGHT_ANGLE))
     {
         isWalking = false;
     }


     if (isWalking)
     {
         Vector3 direction = new Vector3(head.transform.forward.x, 0, head.transform.forward.z).normalized * speed * Time.deltaTime;
         Quaternion rotation = Quaternion.Euler(new Vector3(0, -transform.rotation.eulerAngles.y, 0));
         transform.Translate(rotation * direction);
     }

     if (freezeYPosition)
     {
         transform.position = new Vector3(transform.position.x, yOffset, transform.position.z);
     }
 }

}