if obs_type is PyBulletObservationType.BODY_POS \
               or obs_type is PyBulletObservationType.BODY_LIN_VEL \
               or obs_type is PyBulletObservationType.BODY_ANG_VEL:
                n_dim = 7 if obs_type is PyBulletObservationType.BODY_POS else 3
                low += [-np.inf] * n_dim