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Tf library in ROS 2 future release

Will all transform related code in future ROS 2 relases be based on tf2 library ? Or will the tf library from ROS 1 be ported to ROS 2 in any future release ?

The short answer is: no, it is not planned to support tf1 in ROS 2.

The slightly longer answer: tf2 is the successor of tf and available for a long time. The use of tf is deprecated and it should be fairly easy to upgrade any code. It might even be the case that tf 1 won’t be released in a future ROS 1 release. Therefore spending any effort on support tf 1 in ROS 2 is considered not worth it.