unity3d中使用鼠标滑轮键的代码，Unity3d Mouse Wheel Zoom

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下面是java代码，原文转自老外博客，可以考虑下，要在什么时候用下鼠标中键的功能了。
var target : Transform;

var MouseWheelSensitivity = 5;

var MouseZoomMin = 1;

var MouseZoomMax = 7;

private var x = 0.0;

private var y = 0.0;

private var distance = 5.0;
function Start (){
var playerAngle = transform.eulerAngles;

x = playerAngle.y;

y = playerAngle.x;

}
function LateUpdate (){
if (Input.GetAxis("Mouse ScrollWheel") != 0) {
//Debug.Log(Input.GetAxis("Mouse ScrollWheel"));

//Debug.Log(distance);

if (distance >= MouseZoomMin && distance <= MouseZoomMax){
distance -= Input.GetAxis("Mouse ScrollWheel") * MouseWheelSensitivity;
if (distance < MouseZoomMin){distance = MouseZoomMin;}

if (distance > MouseZoomMax){distance = MouseZoomMax;}

}

}
rotation = Quaternion.Slerp(transform.rotation, Quaternion.Euler(y, x, 0), Time.deltaTime * 3);

position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
transform.rotation = rotation;

transform.position = position;

}

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