ROS中訂閱兩個消息，發佈一個數據。

今天測試轉換出來的點雲數據，利用Rviz顯示不出來結果。提示錯誤以下：測試 no message received in Rviz Status:Error. Points Showing [0] points from [0] messages. Topic No messages received. Transform For frame[]: Frame[] does not exis

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