unity 仿3DMax鼠标操作

var target:Transform;
var targetOffset:Vector3;
var distance = 5.0f;
var maxDistance = 2000;
var minDistance = -1000f;
var xSpeed = 300.0f;
var ySpeed = 300.0f;
var yMinLimit = -180;
var yMaxLimit = 180;
var zoomRate = 40;
var aa = 0;
var xdeg = 0;
var ydeg = 0;
var panSpeed = 0.3f;
var zoomDampening = 8.0f;
var xDeg = 0.0f;
var yDeg = 0.0f;
var currentDistance:float;
var desiredDistance:float;
var currentRotation:Quaternion;
var desiredRotation:Quaternion;
var rotation:Quaternion;
var position:Vector3;
var go:GameObject; 

function Start() { Init(); }
function OnEnable() { Init(); }
//***************************摄像机角度计算*************************************//
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);
}
function Init()
    {
        //If there is no target, create a temporary target at 'distance' from the cameras current viewpoint
        if (!target)
        {
            go = new GameObject("Cam Target");
            go.transform.position = transform.position + (transform.forward * distance);
            target = go.transform;
        }

        distance = Vector3.Distance(transform.position, target.position);
        currentDistance = distance;
        desiredDistance = distance;
        currentDistance=265.00;   
        desiredDistance=265.00;
        //be sure to grab the current rotations as starting points.
        position = transform.position;
        rotation = transform.rotation;
        currentRotation = transform.rotation;
        desiredRotation = transform.rotation;
        
        xDeg = Vector3.Angle(Vector3.right, transform.right );
        yDeg = Vector3.Angle(Vector3.up, transform.up );
    }