align object forward with pipe

Hi there, i'm new to unity and to programming, i want to made a game where a ball run un a pipe, in the direction of the pipe, and rotate along the pipe longitudinals, i've succesfully aligned the up vector of the ball with the normal of the mesh through a raycast hit and quaternion rotation, it's possible to align the forward of the object with the texture y? Or with any other method?

 var smoothTime : float = 0.4;
 var speed : float = 500;
 var gravity : float = 50;
 var inputTranslate : boolean = false;
 var inputPhisics : boolean = false;
 
 private var velocity = Vector3.zero;
 private var myNormal : Vector3;
 private var adjustRotation : float = 90;
 
 function Start()
 {
     myNormal = transform.up; // starting character normal 
     
 }
 
 function Update () 
 {
     alignWithNormal();
     if(inputTranslate)
         inputTrans();
     if(inputPhisics)
            inputPhis();    
 }
 
 function inputTrans ()
 {
     if (Input.GetKey    ("up"))
         transform.Translate( Vector3.forward * speed * Time.deltaTime, Space.Self);
         
     if (Input.GetKey    ("down"))
         transform.Translate( -Vector3.forward * speed * Time.deltaTime, Space.Self);
         
     if (Input.GetKey    ("left"))
         transform.Translate( Vector3.left * speed * Time.deltaTime, Space.Self);
         
     if (Input.GetKey    ("right"))
         transform.Translate( Vector3.right * speed * Time.deltaTime, Space.Self);
 }
 
 function inputPhis ()
 {
     if (Input.GetKey("up"))
         rigidbody.AddTorque(transform.forward * speed  );
     if (Input.GetKey("down"))
         rigidbody.AddTorque(-Vector3.forward * speed );
     if (Input.GetKey("left"))
         rigidbody.AddTorque(Vector3.left * speed );
     if (Input.GetKey("right"))
         rigidbody.AddTorque(Vector3.right * speed );
 }
 
 function alignWithNormal ()
 {
     var hit : RaycastHit;
     var ray: Ray;
     var angle : float;
     var angleCorrection : float;
     
     ray = Ray(transform.position, -myNormal);
     if (Physics.Raycast (ray , hit, 10)) 
     {
         myNormal = Vector3.Lerp(myNormal, hit.normal, Time.deltaTime);
         
         rigidbody.AddForce(-hit.normal*gravity);
         var textureCord = hit.textureCoord;
         print(textureCord.y);
         
     }
     
     // rotate character to myNormal...
     var rot = Quaternion.FromToRotation(Vector3.up, myNormal);
     
     transform.rotation = rot;
     
 }