def convert_sol_to_geom(sol):
    """ Convert solution array of me_solver into 3D vectors
    @param sol: Solution numpy array greater than 11 items long

    Examples
    -------------------------
    >>> a = np.arange(18)
    >>> convert_sol_to_geom(a)
    (array([0, 1, 2]), array([3, 4, 5]), array([6, 7, 8]), array([ 9, 10, 11]))

    """
    return (sol[:3], sol[3:6], sol[6:9], sol[9:12])