請問平移(伸縮)關節要點做呢?

[popig]

睇書就甘將box link好,
再去hierarchy個IK set sliding joint同rotational joint,
再按一個按鈕就整好.
但我搵搵個IK都系得rotational joint, 無sliding joint...

另外...本書系max2.5, 那個按鈕是3個藍球有兩條紅線聯埋,
去到max9仲有無那個按鈕呢?