U3D场景摄像机旋转缩放

var target : Transform;
var xSpeed = 250.0;
var ySpeed = 120.0;

var yMinLimit = -20;
var yMaxLimit = 80;

var initDis = 20;
var minDis = 3.0;
var maxDis = 50.0;

var wheelSpeed = 5;

static var x = 0.0;
static var y = 0.0;

static  var distance;

private var position;
private var rotation;

function Start () {

 x = 130;
 y = 30;
 

 transform.rotation = Quaternion.Euler(y, x, 0);;
 transform.position = Quaternion.Euler(y, x, 0) * Vector3(0.0, 0.0, -initDis) + target.position;

 // Make the rigid body not change rotation
    if (rigidbody)
  rigidbody.freezeRotation = true;

}

function Update () {
    if (target) {
  distance = Vector3.Distance(target.position,transform.position);
  if(Input.GetMouseButton(1)){
   x += Input.GetAxis("Mouse X") * xSpeed * 0.02;
   y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02;
   
   y = ClampAngle(y, yMinLimit, yMaxLimit);
  }   
 
  distance-= Input.GetAxis("Mouse ScrollWheel")*wheelSpeed;    //获取鼠标中建响应
  distance = Mathf.Clamp(distance,minDis,maxDis);              //距离取最大值和最小值
 
  rotation = Quaternion.Euler(y, x, 0);
  position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
   
  transform.rotation = rotation;
  transform.position = position;
 
 }
}

static function ClampAngle (angle : float, min : float, max : float) {
 if (angle < -360)
  angle += 360;
 if (angle > 360)
  angle -= 360;
 return Mathf.Clamp (angle, min, max);
}