例如加载turtlebot机器人launch文件如下：(在gazebo仿真中最后都是通过这种方式加载xacro文件的)
<launch>
<arg name="base"/>
<arg name="stacks"/>
<arg name="3d_sensor"/>
<arg name="urdf_file" default="$(find xacro)/xacro.py '$(find turtlebot_description)/robots/$(arg base)_$(arg stacks)_$(arg 3d_sensor).urdf.xacro'"/>
<param name="robot_description" command="$(arg urdf_file)"/>
<!-- Gazebo model spawner -->
<node name="spawn_turtlebot_model" pkg="gazebo_ros" type="spawn_model"
args="$(optenv ROBOT_INITIAL_POSE) -unpause -urdf -param robot_description -model mobile_base -P 1 "/>
<!-- Velocity muxer -->
<node pkg="nodelet" type="nodelet" name="mobile_base_nodelet_manager" args="manager"/>
<node pkg="nodelet" type="nodelet" name="cmd_vel_mux"
args="load yocs_cmd_vel_mux/CmdVelMuxNodelet mobile_base_nodelet_manager">
<param name="yaml_cfg_file" value="$(find turtlebot_bringup)/param/mux.yaml"/>
<remap from="cmd_vel_mux/output" to="mobile_base/commands/velocity"/>
</node>
<!-- Bumper/cliff to pointcloud (not working, as it needs sensors/core messages) -->
<include file="$(find turtlebot_bringup)/launch/includes/kobuki/bumper2pc.launch.xml"/>
</launch>
当设置xyz时，如下：
<node name="spawn_turtlebot_model" pkg="gazebo_ros" type="spawn_model"
args="$(optenv ROBOT_INITIAL_POSE) -unpause -urdf -param robot_description -model mobile_base -x ${arg value1} -y ${arg value2} -z ${arg value3}"/>
当设置rpy(roll/pitch/yaw)时,如下：
<node name="spawn_turtlebot_model" pkg="gazebo_ros" type="spawn_model"
args="$(optenv ROBOT_INITIAL_POSE) -unpause -urdf -param robot_description -model mobile_base -R ${arg value1} -P ${arg value2} -Y ${arg value3}"/>
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