[ros-users] "could not find common time"-problem with tf

[Wim Meeussen]

Hi Sabrina,

The tf_monitor tool will give you more detailed info about timestamps,
publishing frequencies and delays. In the tf package, run:

./bin/tf_monitor  base_link map

Check the output of this tool at the time your node fails to transform
between map and base_link.  If it still does not work for you, please
attach the output of this tool to your email.

Wim





On Sat, Apr 17, 2010 at 2:55 AM,  <sabrinakliegl at innok.de> wrote:
> Hi Tully,
>
>> Could you check some of the debugging outputs from tf.  There are debugging
>> methods here:  http://www.ros.org/wiki/tf/Debugging%20tools  Of particular
>> interest is the output of view_frames.
>
> I did check the output of view_frames and there is only ONE tree, also
> the TF-display of rviz display the tree correctly.
>
>> Also, are you running in simulation?  If so do you have /using_sim_time set
>> to true?  This can cause a race condition at startup and cause the "no
>> common time" error.  See documentation here http://www.ros.org/wiki/Clock
>
> No, I am not running in simulation but on the real robot (a P3AT).
>
> The most strange thing is - in my opinion - that I can get the correct
> transformation with tf_echo while my code is throwing this error.
>
> Regards,
> Sabrina
>
>
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-- 
--
Wim Meeussen
Willow Garage Inc.
<http://www.willowgarage.com)