Here is a bit of example code. This is not based on the texture coordinate, but based on the Raycast hit position. To test:

• Start with a new scene

• Add a sphere with a texture

• Add the script to the sphere

  ---

  pragma strict

  public var speed = 45.0; private var qTo : Quaternion; private var trans : Transform;

  function Start() { trans = transform; qTo = trans.rotation; }

  function Update() { if (Input.GetMouseButtonDown(0)) { var hit : RaycastHit; var ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (Physics.Raycast(ray, hit) && hit.transform == trans) { qTo = Quaternion.FromToRotation(hit.point - trans.position, Camera.main.transform.position - trans.position); qTo = qTo * transform.rotation; } }

     transform.rotation = Quaternion.RotateTowards(trans.rotation, qTo, Time.deltaTime * speed);
   }