public final void headTo(Tuple3d p){
  double angle=Geometric.angle(this.location,p);
  turnTo(Math.toDegrees(angle));
}

public final void headTo ( Tuple3d p ) { double angle = Geometric . angle ( this . location , p ) ; turnTo ( Math . toDegrees ( angle ) ) ; }
head to the direction of the given point .
