Hi Eitan, I've attached the results of view_frames. I have also tried the other stuff on the troubleshooting guide. Transformations between the laser frame and every other frame work fine. Across the longest tf-chain (/front_laser to /map) the average delay is approx 25ms and the maximal delay is approx. 55ms. From this it appears to me that the tf-tree is correctly set up, but maybe there is something else I can check? Regards, Jan Elseberg Eitan Marder-Eppstein wrote: > > Jan, > > It sounds like something may be wrong with your transform tree. Can > you try running "rosrun tf view_frames"? This will generate a PDF of > the current transform tree structure. You may also want to check the > troubleshooting link on the sidebar of this page: http://www > .ros.org/wiki/tf for more information on > useful tf debugging strategies. > > Hope this helps, > > Eitan > >> On May 20, 2010 3:38 AM, "Jan Elseberg" >> > > wrote: >> >> Hi everyone, >> >> I am trying to get our robot to work with the navigation stack of ros. >> I've been following the tutorial on >> http://www.ros.org/wiki/navigation/Tutorials/RobotSetup . After setting >> up the robot with a tf-tree and sensor nodes , I have noticed a problem >> with rviz. I am unable to display the laserscan messages in any frame >> other than the laser coordinate system itself, i.e., whenever I select a >> other than /front_laser the status of the laser scan >> display shows the error: >> >> "Unknown reason for transform failure". >> >> Also, this warning appears in the bash: >> >> [WARN] 1274341043.701801000: MessageFilter [target=/base_link ]: Dropped >> 99.03% of messages so far. Please turn the [ros.rviz.message_notifier] >> rosconsole logger to DEBUG for more information. >> >> Doing so gives me these repeating debug messages: >> >> MessageFilter [target=/base_link ]: Added message in frame /front_laser >> at time 1274341252.994, count now 10 >> MessageFilter [target=/base_link ]: Removed oldest message because >> buffer is full, count now 10 (frame_id=/front_laser, >> stamp=1274341252.813649). >> >> This suggests a problem with the tf-tree to me. However, when using the >> "transformPoint(...)" function of tf::TransformListener in my own nodes >> to transform the laser scan into the global frame everything works as >> intended with no errors/warnings. >> >> Does someone have an idea what I am doing wrong? >> >> Thank you for any help! >> >> >> Jan Elseberg >> >> _______________________________________________ >> ros-users mailing list >> ros-users@code.ros.org >> https://code.ros.org/mailman/listinfo/ros-users