Fail with movedirection of Character Controller

I add character controller to scene, and try to make it to patrol. Moreover character should rotate over terrain. And how can I provide coordinates of Point(to move) as direction. In my case it doesn't work, character moves rapidly somewhere

     var i: int;
 public var point_arr: Vector3[];
 var point_move: Vector3;
 var myTarget:GameObject;
 var myDistance;
 var speed : float = 6.0;
 var jumpSpeed : float = 8.0;
 var gravity : float = 10.0;
 var normal_q: Quaternion;
 var terr_q: Quaternion;
 var moveDirection:Vector3;
 
 function Start(){
 i = 0;
 point_move = point_arr[0];
 }
 
 function myMove(mytarget: Vector3){
 var controller : CharacterController = GetComponent(CharacterController);
 if (controller.isGrounded) {
 moveDirection = transform.TransformDirection(mytarget);
 //moveDirection *= speed;
 }
 
 moveDirection.y -= gravity * Time.deltaTime;
 controller.Move(moveDirection * Time.deltaTime);
 
 var hit: RaycastHit;
 if(Physics.Raycast (transform.position, -Vector3.up, hit, 10.0))
 {
 
         normal_q = Quaternion.FromToRotation(Vector3.up, hit.normal);
         terr_q = normal_q * Quaternion.AngleAxis(transform.rotation.eulerAngles.y, hit.normal);
         transform.rotation = Quaternion.Slerp(transform.rotation, terr_q, Time.deltaTime);
 
 }
 
 }
 
 
 function Update() {
 point_move = point_arr[i];
 point_move.y = transform.position.y;
 myDistance  = Vector3.Distance(transform.position,point_move);
 
 if(myDistance>1){
 myMove(point_arr[i]);
 }
 else{
 if(i==point_arr.length-1){i=0;}
 else{i ++;}
 }
 
 }

Thanks