For any who find this thread in the future, it was asked and solved on ROS
Answers:
http://answers.ros.org/question/906/tf-spits-a-lookup-exception
- Eric
On Mon, May 16, 2011 at 12:11 AM, Tully Foote <
tfoote@willowgarage.com>wrote:
> Hi Dimitar,
>
> I expect that this error comes from improper usage of the library in your
> code. I suggest that you isolate it down to as small a test case as you can
> reproduce and ask it on answers.ros.org. If it is determined to be a bug
> then a ticket can be filed to fix it.
>
> Tully
>
> On Tue, May 10, 2011 at 6:26 AM, Dimitar Simeonov <
> simeonov.dimitar@gmail.com> wrote:
>
>> Hello,
>> I'm not sure whether this is better asked at answers.ros.org, but since
>> it looks like a bug I'm sending it here
>>
>> I'm using the tf package and specifically the tf.TransformerROS class in
>> Python.
>> If I try calling its methods transformPose or transformPointCloud it
>> returns a LookupException
>>
>> tf.LookupException: Frame id /map does not exist! When trying to
>> transform between /base_link and /map.
>>
>> However if I try running the tf_monitor right after that I see that tf has
>> knowledge of the frame
>>
>> ~>rosrun tf tf_monitor base_link map
>> Waiting for transform chain to become available between /base_link and
>> /map
>>
>> RESULTS: for /base_link to /map
>> Chain is: /base_link -> /base_footprint -> /odom_combined -> /map
>> Net delay avg = 0.00684423: max = 0.054
>>
>> Frames:
>> Frame: /base_footprint published by /robot_pose_ekf Average Delay:
>> 0.0185 Max Delay: 0.026
>> Frame: /base_link published by /robot_state_publisher Average Delay:
>> 0.0075 Max Delay: 0.008
>> Frame: /odom_combined published by /slam_gmapping Average Delay: 0 Max
>> Delay: 0
>>
>> All Broadcasters:
>> Node: /robot_pose_ekf 33.5196 Hz, Average Delay: 0.0185 Max Delay:
>> 0.026
>> Node: /robot_state_publisher 55.5556 Hz, Average Delay: 0.0075 Max
>> Delay: 0.008
>> Node: /slam_gmapping 25 Hz, Average Delay: 0 Max Delay: 0
>>
>> I'm running gazebo simulation and have ROBOT=sim set.
>>
>> Best,
>> Dimitar
>> _______________________________________________
>> ros-users mailing list
>> ros-users@code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>>
>
>
> --
> Tully Foote
> Systems Engineer
> Willow Garage, Inc.
> tfoote@willowgarage.com
> (650) 475-2827
>
> _______________________________________________
> ros-users mailing list
> ros-users@code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>
>