Add a new set of points to the existing one without removing it.
        
        :param points: Points to be added.
        :type points: ndarray (shape=(N, 3))
        :returns: None

def add_set_of_points(self, points):
        """
        Add a new set of points to the existing one without removing it.
        
        :param points: Points to be added.
        :type points: ndarray (shape=(N, 3))
        :returns: None
        """
        self.set_of_points = np.concatenate((self.set_of_points, points))