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MoveIt: get current desired end effector pose

asked 2014-08-07 10:15:28 -0500

arennuit gravatar image

updated 2017-02-24 19:32:26 -0500

130s gravatar image

Hello there,

I am trying to get access to the current desired end effector's transform output by MoveIt (actually my goal is to compute the tracking error). My feeling is that I need to do the following steps:

  • Get the desired joint angles from MoveIt
  • Parse the urdf (to build a direct geometric model), or is there a package which computes the direct geometric model of the robot out of its urdf?
  • Compute the end effector's desired transform from the geometric model and the desired joint angles

Am I right?

Now a question more related to code:

I guess the desired joint angles are provided by moveit in topic /arm_controller/follow_joint_trajectory/goal, no? This topic is of type control_msgs/FollowJointTrajectoryActionGoal (api in ROS Kinetic). I also guess the trajectory is in field goal.trajectory.points.positions. fields points and positions are arrays: do you know how I should interpret them? Also does the fact that these are arrays mean that the whole desired trajectory is sent at one and not per small time steps?

Thansk!

Antoine.

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answered 2017-02-24 19:34:03 -0500

130s gravatar image

Could be just English wording, but I guess by "desired" you mean "commanded", or the order MoveIt! sends to ROS network. If I'm right, then you basically get things right I think.

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If 'commanded', then yes (although this would be at the level MoveIt<->controller, not controller<->hw). If 'current', then no.

gvdhoorn gravatar imagegvdhoorn ( 2017-02-25 03:51:37 -0500 )edit

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Asked: 2014-08-07 10:15:28 -0500

Seen: 874 times

Last updated: Feb 24 '17