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放置摄像机后，回到开始的TICK，但是不是摄像机视角，摄像机的轨迹显示在运动怎么办
mirv_input camera关了没
多按几次I，多按几次I，多按几次I，有时候是有点问题 ，或者保存轨迹重进demo就可以了
