public void UserLookAt(UserLookAtArguments e)
 {
     var _target = this.Target(e.user);
     if (_target == null) return;
     _target.UserLookAt(this.user, e.arc);
 }
 public void UserLookAt(UserLookAtArguments e)
 {
     this.Target.UserLookAt(this.user, e.arc);
 }