var collision = m_ctl.create_collision_sensor(obj, null, true);

var collision_cb = function(obj, id, pulse) {
    if (pulse == 1) {
        var coll_dist = m_ctl.get_sensor_payload(obj, id, 0).coll_dist;
        if (coll_dist < 0) {
            var coll_norm = m_ctl.get_sensor_payload(obj, id, 0).coll_norm;
            var recover_offset = _vec3_tmp;
            m_vec3.scale(coll_norm, -0.25 * coll_dist, recover_offset);
            var trans = m_trans.get_translation(obj, _vec3_tmp2);
            m_vec3.add(trans, recover_offset, trans);
            m_trans.set_translation_v(obj, trans);
        }
    }
}
m_ctl.create_sensor_manifold(obj, "COLLISION", m_ctl.CT_CONTINUOUS,
        [collision], null, collision_cb);