[ros-users] Is gazebo/apply_joint_effort cumulative?
John Hsu
johnhsu at willowgarage.com
Tue Feb 1 00:43:26 UTC 2011
You're right, the wiki documentation is incorrect, the supplied request
should be of type gazebo.srv.JointRequest, not gazebo.srv.ClearJointForces.
I'll update the wiki.
Thanks,
John
On Mon, Jan 31, 2011 at 4:35 PM, Jim Rothrock <
jim.rothrock at wunderkammerlab.com> wrote:
> On 01/28/2011 05:44 PM, John Hsu wrote:
>
>
> Is my understanding correct?
>>
>
> yes, the forces applied are cumulative. I've updated the wiki to reflect
> so.
>
> Thank you.
>
>
> I tried to use gazebo/clear_joint_forces instead of applying a -0.01
>> effort, but it appears that clear_joint_forces is no longer in ROS, even
>> though it is in the Gazebo package documentation in the ROS wiki.
>>
>
> which release are you running? I see the clear_joint_forces service
> calls in both cturtle<https://code.ros.org/svn/ros-pkg/stacks/simulator_gazebo/tags/cturtle/gazebo/src/gazeboros.cpp>and
> unstable<https://code.ros.org/svn/ros-pkg/stacks/simulator_gazebo/tags/unstable/gazebo/src/gazeboros.cpp>(diamondback
> alpha) files.
>
> I am running C-Turtle for Ubuntu. "rosnode info gazebo" shows
> /gazebo/clear_joint_forces in the service list, but "rossrv package gazebo"
> does not list gazebo/ClearJointForces.
> "locate ClearJointForces" doesn't find anything, but "locate
> ApplyJointEffort" shows:
>
>
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/src/gazebo/srv/_ApplyJointEffort.py
>
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/src/gazebo/srv/_ApplyJointEffort.pyc
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/srv/ApplyJointEffort.srv
>
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/srv/lisp/gazebo/.ApplyJointEffort.asd-dep
>
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/srv/lisp/gazebo/ApplyJointEffort.lisp
>
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/srv/lisp/gazebo/_package_ApplyJointEffort.lisp
>
> /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/srv_gen/cpp/include/gazebo/ApplyJointEffort.h
>
> "ls /opt/ros/cturtle/stacks/simulator_gazebo/gazebo/srv" lists:
>
> ApplyBodyWrench.srv GetModelProperties.srv SetLinkProperties.srv
> ApplyJointEffort.srv GetModelState.srv SetLinkState.srv
> BodyRequest.srv GetPhysicsProperties.srv SetModelConfiguration.srv
> DeleteModel.srv GetWorldProperties.srv SetModelState.srv
> GetJointProperties.srv JointRequest.srv SetPhysicsProperties.srv
> GetLinkProperties.srv lisp SpawnModel.srv
> GetLinkState.srv SetJointProperties.srv
>
> This works:
>
> rospy.wait_for_service("gazebo/apply_joint_effort")
> _apply_joint_effort = rospy.ServiceProxy("gazebo/apply_joint_effort",
> gazebo.srv.ApplyJointEffort)
>
> but this:
>
> rospy.wait_for_service("gazebo/clear_joint_forces")
> _clear_joint_forces = rospy.ServiceProxy("gazebo/clear_joint_forces",
> gazebo.srv.ClearJointForces)
>
> results in this:
>
> Traceback (most recent call last):
> File "truck.py", line 141, in <module>
> gazebo.srv.ClearJointForces)
> AttributeError: 'module' object has no attribute 'ClearJointForces'
>
> --
> Jim Rothrock | Wunderkammer Laboratoryjim.rothrock at wunderkammerlab.com
>
>
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>
>
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