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Elevator problem

I am a Chinese, not English, so use Chinese to ask questions, please forgive me.
电梯困绕我这菜鸟好几天了,有没有哪位大神给个简单明了的蓝图,
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这个蓝图还是做不到电梯的效果,昨晚睡不好,想到能否获得ACTOR的当前坐标,沿Z轴到达目标点(1.2.3)层,这样不是更简单明了吗?可是要怎么用蓝图来实现呢?