SmoothFollow2D.js

var target : Transform;
var distance = 3.0;
var height = 3.0;
var damping = 5.0;
var smoothRotation = true;
var rotationDamping = 10.0;
var lockRotation :boolean;
private var cam;

function Start(){
	cam = Camera.main;
}

function Update () {
	var wantedPosition = target.TransformPoint(-0, height, -distance);
	transform.position = Vector3.Lerp (transform.position, wantedPosition, Time.deltaTime * damping);

	if (smoothRotation) {
		var wantedRotation = Quaternion.LookRotation(target.position - transform.position, target.up);
		transform.rotation = Quaternion.Slerp (transform.rotation, wantedRotation, Time.deltaTime * rotationDamping);
	}

	else transform.LookAt (target, target.up);
	
	if (lockRotation){
		transform.localRotation = Quaternion.Euler(0,0,0);
	}

	if (Input.GetKey(KeyCode.Equals)){ // back
		if (cam.orthographicSize > 5){
		    	cam.orthographicSize -= 0.5;
		}
	}
	if (Input.GetKey(KeyCode.Minus)){ // forward
		if (cam.orthographicSize < 12){
			cam.orthographicSize += 0.5;
		}
	}
}