GZ Docs

ur_simulation_gz/doc/index.rst

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+ur_simulation_gz
+================
+
+This package contains configurations and example files for Gazebo simulation of Universal Robots manipulators.
+
+Structure of the repository
+---------------------------
+
+To set up the simulation the used files are:
+
+- ``urdf/ur_gz.ros2_control.xacro`` - macro for ros2_control configuration, defining the initial joint positions and the hardware interface plugin for the simulation
+- ``urdf/ur_gz.urdf.xacro`` - main file that contains the robot description, defines reference for the Gazebo world and initializes ros2_control Gazebo plugin.
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   installation
+   usage

ur_simulation_gz/doc/installation.rst

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+Installation
+============
+
+Skip any of below steps is not applicable.
+
+Setup ROS2 Workspace
+--------------------
+
+1. Create a colcon workspace:
+
+.. code-block:: console
+
+   $ export COLCON_WS=~/workspaces/ur_gz
+   $ mkdir -p $COLCON_WS/src
+
+.. note::
+   Feel free to change ``~/workspaces/ur_gz`` to whatever absolute path you want.
+
+.. note::
+
+   Over time you will probably have multiple ROS workspaces, so it makes sense to them all in a subfolder.
+
+   Also, it is good practice to put the ROS version in the name of the workspace, for different tests you could just add a suffix to the base name ``ur_gz``.
+
+2. Download the required repositories and install package dependencies:
+
+.. code-block:: console
+
+    $ cd $COLCON_WS
+    $ git clone -b ros2 https://github.com/UniversalRobots/Universal_Robots_ROS2_GZ_Simulation.git src/ur_simulation_gz
+    $ vcs import --input src/ur_simulation_gz/ur_simulation_gz-not-released.rolling.repos src # only required for rolling
+    $ rosdep update && rosdep install --ignore-src --from-paths src -y
+
+Configure and build Workspace
+-----------------------------
+
+To configure and build the workspace execute following commands:
+
+.. code-block:: console
+
+   $ source /opt/ros/rolling/setup.bash # necessary after installing gz-sim-vendor
+   $ cd $COLCON_WS
+   $ colcon build --symlink-install
+
+and finally source your workspace before launching anything else
+
+.. code-block:: console
+
+    $ source $COLCON_WS/install/setup.bash

ur_simulation_gz/doc/resources/test_world.sdf

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+<sdf version='1.10'>
+  <world name='default'>
+    <gravity>0 0 -9.8000000000000007</gravity>
+    <magnetic_field>5.5644999999999998e-06 2.2875799999999999e-05 -4.2388400000000002e-05</magnetic_field>
+    <atmosphere type='adiabatic'/>
+    <physics type='ode'>
+      <max_step_size>0.001</max_step_size>
+      <real_time_factor>1</real_time_factor>
+      <real_time_update_rate>1000</real_time_update_rate>
+    </physics>
+    <scene>
+      <ambient>0.400000006 0.400000006 0.400000006 1</ambient>
+      <background>0.699999988 0.699999988 0.699999988 1</background>
+      <shadows>true</shadows>
+    </scene>
+    <model name='charmander'>
+      <pose>0.29999999999999999 1 0.050000000000000003 0 0 0</pose>
+      <link name='box_link'>
+        <inertial>
+          <inertia>
+            <ixx>0.16666</ixx>
+            <ixy>0</ixy>
+            <ixz>0</ixz>
+            <iyy>0.16666</iyy>
+            <iyz>0</iyz>
+            <izz>0.16666</izz>
+          </inertia>
+          <mass>1</mass>
+          <pose>0 0 0 0 0 0</pose>
+        </inertial>
+        <collision name='box_collision'>
+          <geometry>
+            <box>
+              <size>0.050000000000000003 0.050000000000000003 0.050000000000000003</size>
+            </box>
+          </geometry>
+          <surface>
+            <friction>
+              <ode/>
+            </friction>
+            <bounce/>
+            <contact/>
+          </surface>
+        </collision>
+        <visual name='box_visual'>
+          <geometry>
+            <box>
+              <size>0.050000000000000003 0.050000000000000003 0.050000000000000003</size>
+            </box>
+          </geometry>
+          <material>
+            <ambient>0.300000012 0.300000012 0.300000012 1</ambient>
+            <diffuse>0.699999988 0.699999988 0.699999988 1</diffuse>
+            <specular>1 1 1 1</specular>
+          </material>
+        </visual>
+        <pose>0 0 0 0 0 0</pose>
+        <enable_wind>false</enable_wind>
+      </link>
+      <static>true</static>
+      <self_collide>false</self_collide>
+    </model>
+    <model name='bulbasaur'>
+      <pose>0 1 0.050000000000000003 0 0 0</pose>
+      <link name='box_link'>
+        <inertial>
+          <inertia>
+            <ixx>0.16666</ixx>
+            <ixy>0</ixy>
+            <ixz>0</ixz>
+            <iyy>0.16666</iyy>
+            <iyz>0</iyz>
+            <izz>0.16666</izz>
+          </inertia>
+          <mass>1</mass>
+          <pose>0 0 0 0 0 0</pose>
+        </inertial>
+        <collision name='box_collision'>
+          <geometry>
+            <box>
+              <size>0.050000000000000003 0.050000000000000003 0.050000000000000003</size>
+            </box>
+          </geometry>
+          <surface>
+            <friction>
+              <ode/>
+            </friction>
+            <bounce/>
+            <contact/>
+          </surface>
+        </collision>
+        <visual name='box_visual'>
+          <geometry>
+            <box>
+              <size>0.050000000000000003 0.050000000000000003 0.050000000000000003</size>
+            </box>
+          </geometry>
+          <material>
+            <ambient>0.300000012 0.300000012 0.300000012 1</ambient>
+            <diffuse>0.699999988 0.699999988 0.699999988 1</diffuse>
+            <specular>1 1 1 1</specular>
+          </material>
+        </visual>
+        <pose>0 0 0 0 0 0</pose>
+        <enable_wind>false</enable_wind>
+      </link>
+      <static>true</static>
+      <self_collide>false</self_collide>
+    </model>
+    <model name='squirtle'>
+      <pose>-0.29999999999999999 1 0.050000000000000003 0 0 0</pose>
+      <link name='box_link'>
+        <inertial>
+          <inertia>
+            <ixx>0.16666</ixx>
+            <ixy>0</ixy>
+            <ixz>0</ixz>
+            <iyy>0.16666</iyy>
+            <iyz>0</iyz>
+            <izz>0.16666</izz>
+          </inertia>
+          <mass>1</mass>
+          <pose>0 0 0 0 0 0</pose>
+        </inertial>
+        <collision name='box_collision'>
+          <geometry>
+            <box>
+              <size>0.050000000000000003 0.050000000000000003 0.050000000000000003</size>
+            </box>
+          </geometry>
+          <surface>
+            <friction>
+              <ode/>
+            </friction>
+            <bounce/>
+            <contact/>
+          </surface>
+        </collision>
+        <visual name='box_visual'>
+          <geometry>
+            <box>
+              <size>0.050000000000000003 0.050000000000000003 0.050000000000000003</size>
+            </box>
+          </geometry>
+          <material>
+            <ambient>0.300000012 0.300000012 0.300000012 1</ambient>
+            <diffuse>0.699999988 0.699999988 0.699999988 1</diffuse>
+            <specular>1 1 1 1</specular>
+          </material>
+        </visual>
+        <pose>0 0 0 0 0 0</pose>
+        <enable_wind>false</enable_wind>
+      </link>
+      <static>true</static>
+      <self_collide>false</self_collide>
+    </model>
+  </world>
+</sdf>

ur_simulation_gz/doc/resources/ur_controllers_test.yaml

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+controller_manager:
+  ros__parameters:
+    update_rate: 500  # Hz
+
+    joint_state_broadcaster:
+      type: joint_state_broadcaster/JointStateBroadcaster
+
+    joint_trajectory_controller:
+      type: joint_trajectory_controller/JointTrajectoryController
+
+
+joint_trajectory_controller:
+  ros__parameters:
+    joints:
+      - alice_shoulder_pan_joint
+      - alice_shoulder_lift_joint
+      - alice_elbow_joint
+      - alice_wrist_1_joint
+      - alice_wrist_2_joint
+      - alice_wrist_3_joint
+    command_interfaces:
+      - position
+    state_interfaces:
+      - position
+      - velocity
+    state_publish_rate: 100.0
+    action_monitor_rate: 20.0
+    allow_partial_joints_goal: false
+    constraints:
+      stopped_velocity_tolerance: 0.2
+      goal_time: 0.0
+      alice_shoulder_pan_joint: { trajectory: 0.2, goal: 0.1 }
+      alice_shoulder_lift_joint: { trajectory: 0.2, goal: 0.1 }
+      alice_elbow_joint: { trajectory: 0.2, goal: 0.1 }
+      alice_wrist_1_joint: { trajectory: 0.2, goal: 0.1 }
+      alice_wrist_2_joint: { trajectory: 0.2, goal: 0.1 }
+      alice_wrist_3_joint: { trajectory: 0.2, goal: 0.1 }

ur_simulation_gz/doc/usage.rst

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+Usage
+=====
+
+Launch Files
+------------
+
+To launch the simulation, two files can be used:
+
+- ``launch/ur_sim_control.launch.py``
+- ``launch/ur_sim_moveit.launch.py``
+
+They both start Gazebo, but only the second launches MoveIt! together with it, allowing to plan motions using either MoveGroup interfaces or the Motion Planning panel in Rviz.
+
+So, if only Gazebo and Rviz are needed:
+
+.. code-block:: console
+
+   $ ros2 launch ur_simulation_gz ur_sim_control.launch.py ur_type:=ur10e
+
+Which can be tested by using a test script from ``ur_robot_driver`` (if installed), in a new terminal:
+
+.. code-block:: console
+
+   $ ros2 launch ur_robot_driver test_joint_trajectory_controller.launch.py
+
+If we also want to be able to use MoveIt!, then:
+
+.. code-block:: console
+
+    $ ros2 launch ur_simulation_gz ur_sim_moveit.launch.py ur_type:=ur10e
+
+.. image:: resources/gz_simulation_moveit.png
+   :width: 95%
+   :alt: Gazebo with MoveIt!
+
+.. note::
+
+   All the additional launch arguments are described in the launch files themselves.
+
+Customization
+-------------
+
+Beyond the default usage, the package offers some customization options.
+
+Custom Description
+^^^^^^^^^^^^^^^^^^
+
+To use a custom robot / scene description, the launch argument ``description_file`` can be specified,  which allows to pass the absolute path of a custom description to both launchers. Together with it, it could be useful to choose a custom Rviz configuration file and the launch argument ``rviz_config_file`` can be passed for that. An example of their usage:
+
+.. code-block:: console
+
+   $ ros2 launch ur_simulation_gz ur_sim_control.launch.py ur_type:=ur10e description_file:="/home/ubuntu/ur_gz_test.urdf.xacro" rviz_config_file:="/home/ubuntu/rviz_test.rviz"
+
+tf_prefix
+^^^^^^^^^
+
+Also here, like in the driver package, it is possible to specify a tf_prefix using the ``tf_prefix`` launch argument, but for this package this is not the only step required. Since controller loading is handled differently, it is necessary to define a custom controllers file with the desired tf_prefix. Assuming ``tf_prefix:="alice_"``, an example of such file could be:
+
+.. literalinclude:: resources/ur_controllers_test.yaml
+   :language: yaml
+   :emphasize-lines: 15-20, 32-37
+
+To load the newly defined file, it is possible to specify its absolute path with the ``controllers_file`` argument. Together with it the desired prefix should be also be specified as argument, like in the following example:
+
+.. code-block:: console
+
+   $ ros2 launch ur_simulation_gz ur_sim_control.launch.py ur_type:=ur10e tf_prefix:="alice_" controllers_file:="/home/ubuntu/ur_controllers_test.yaml"
+
+.. note::
+
+   The ``tf_prefix`` argument is not available for ``ur_sim_moveit.launch.py``, since it would require a custom definition of the moveit config package for properly setting it up.
+
+Custom World
+^^^^^^^^^^^^
+
+The last customization option allows to instantiate the robot in a proper setup instead of an empty world, like the given launch files do by default. The first step to create a complete simulation is to define a world file (.sdf): for this example we can use a simple custom world ``test_world.sdf``, located it in ``ur_gz_simulation/doc/resources``. For more details about building worlds in Gazebo, it's possible to check the `related tutorial <https://gazebosim.org/docs/harmonic/sdf_worlds>`_.
+To use the new world changes it's enough to specify its absolute path in the ``world_file`` argument:
+
+
+.. code-block:: console
+
+   $ ros2 launch ur_simulation_gz ur_sim_control.launch.py ur_type:=ur10e world_file:=<path_to_gz_simulation>/doc/resources/test_world.sdf
+
+or using MoveIt!
+
+.. code-block:: console
+
+   $ ros2 launch ur_simulation_gz ur_sim_moveit.launch.py ur_type:=ur10e world_file:=<path_to_gz_simulation>/doc/resources/test_world.sdf
+
+In this way, when launching the simulation, Gazebo will use the indicated custom world instead of the default empty, like in the following picture.
+
+.. image:: resources/gz_simulation_custom_world.png
+   :width: 95%
+   :alt: Gazebo custom world