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As far as I know, TF has not been ported yet to the native implementation of rosjava, but the transformBroadcaster should be pretty easy to implement because it doesn't need any fancy transform calculations and bookkeeping to support time traveling. It just publishes a message. All you need to do is creating a publisher to the /tf topic with type tf/tfMessage and publish the transform you want to broadcast by hand.

If you need more features, e.g. requesting the transform between two frames, you can think about porting the old TF implementation for the JNI based rosjava. You can find it here: http://code.in.tum.de/indefero/index.php//p/client-rosjava/source/tree/master/tfjava.