左键点击插值旋转，不影响右键控制视角

var newpoint:Vector3;
static var xover:boolean=false;
function Start (){
    newpoint=Vector3.zero;
}

function Update () {
    print(transform.rotation);
    if(Input.GetKey(KeyCode.Mouse0)){
        var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        var hit : RaycastHit;
        if (Physics.Raycast (ray, hit, 100)) {
            newpoint=hit.point;
            xover=true;
        }
    }
    if(xover==true){
        var newpointRotation=Quaternion.LookRotation(newpoint-transform.position,Vector3.up);
        transform.rotation=Quaternion.Slerp(transform.rotation,newpointRotation,Time.deltaTime*10.0);
        var targetDir =newpoint-transform.position;
        var forward = transform.forward;
        var angle = Vector3.Angle(forward,targetDir);
        if(angle <5){
            xover=false;
        }
    }
}