SmoothFollowCollisionCamera

var target : Transform;
var distance = 10.0;
var minDistance = 1;
var maxDistance = 10;
var height = 5.0;
var heightDamping = 2.0;
var rotationDamping = 3.0;
var wallMask: LayerMask;
private var defaultPos : Vector3;
@script AddComponentMenu("Camera-Control/Smooth Follow")
function Start (){
if(target==null)
 target = GameObject.FindWithTag("Player").transform;
}

function LateUpdate ()
{
    if (!target)
        return;
    var wantedRotationAngle = target.eulerAngles.y;
    var wantedHeight = target.position.y + height;
    var currentRotationAngle = transform.eulerAngles.y;
    var currentHeight = transform.position.y;
    currentRotationAngle = Mathf.LerpAngle (currentRotationAngle, wantedRotationAngle, rotationDamping * Time.deltaTime);
    currentHeight = Mathf.Lerp (currentHeight, wantedHeight, heightDamping * Time.deltaTime);
    var currentRotation = Quaternion.Euler (0, currentRotationAngle, 0);
   // transform.position = target.position;
    //transform.position -= currentRotation * Vector3.forward * distance;
    //transform.position.y = currentHeight;
    defaultPos = target.position;
    defaultPos -= currentRotation * Vector3.forward * distance;
    defaultPos.y = currentHeight;
    var hit : RaycastHit;
    if(Physics.Linecast(target.position,transform.position, hit,wallMask))
    {
        Debug.Log("hitWall");
        Debug.DrawLine(transform.position, target.position, Color.cyan);
        distance = Mathf.Clamp(hit.distance, minDistance, maxDistance);
    }
    transform.position = defaultPos;
    transform.LookAt (target);
}