code: def get_max_ballcount(cls, ball_diam, rolling_radius, min_gap=0.):
          
  
          min_arc = asin(((ball_diam + min_gap) / 2) / rolling_radius) * 2
          return int((2 * pi) / min_arc)
docs: The maximum number of balls given ``rolling_radius`` and ``ball_diam``
  
          :param min_gap: minimum gap between balls (measured along vector between
                          spherical centers)
          :type min_gap: :class:`float`
          :return: maximum ball count
          :rtype: :class:`int`