Camera zoom

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//zoom camera
var distance : float = 60;
var sensitivityDistance : float = 50;
var damping : float = 5;
var minFOV : float = 40;
var maxFOV : float = 60;

function Start () {
    distance = camera.fieldOfView;
}

function Update () {

    distance -= Input.GetAxis("Mouse ScrollWheel") * sensitivityDistance;
    distance = Mathf.Clamp(distance, minFOV, maxFOV);
    camera.fieldOfView = Mathf.Lerp(camera.fieldOfView, distance, Time.deltaTime * damping);
}