单击鼠标左键 物体朝向点击点

function Update () {
    var newpoint:Vector3 ;
    var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
    var hit : RaycastHit;
    if (Physics.Raycast (ray, hit, 100)) {
        Debug.DrawLine (ray.origin, hit.point);
    }

    if(Input.GetKeyDown(KeyCode.Mouse0)){
        newpoint =hit.point;
        print(transform.position.y);
        transform.LookAt(Vector3(newpoint[0],transform.position.y,newpoint[2]));

    }
}