Get Last Value

Hey, all!

I need to tell if my character is moving uphill or downhill and change the speed accordingly. However, when I debug my values, the normal of the last measurement is ALWAYS identical to the normal of the current one. Is there something wrong with my code?

Thanks!- YA

     void Align( Transform player, RaycastHit2D hit ){
         float groundAngle = Vector3.Angle ( Vector3.up, hit.normal);
         Debug.Log ( "Last angle was: " + lastAngle );
         Debug.Log ("This angle is: " + groundAngle );
         if( groundAngle < angleLimit ){
             //Align player to surface norma
             player.transform.rotation = Quaternion.FromToRotation ( Vector3.up, hit.normal );
 
             float newSpeed = moveSpeed + ((groundAngle/angleLimit)*Mathf.Sign( groundAngle*lastAngle ))*speedFlux;
             transform.Translate( newSpeed*Time.deltaTime*Input.GetAxisRaw ("Horizontal"), 0, 0);
 
             //Move player
             Vector3 newPos = new Vector3( transform.position.x, hit.point.y-0.1f, transform.position.z);
             //Stick to face on y axis
             transform.position = newPos;
             lastAngle = groundAngle;
             Debug.Log ( "New speed is: " + newSpeed );
         }
         else Debug.Log("POOP");
         }