xacro是urdf模型文件的升级版。如果想要在gazebo中用ros的spawn-model以<group ns="$arg(namespace)">同时打开多个这个xacro模型，要注意xacro文件中不要设置绝对的命名空间！
<gazebo>
<plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
<legacyModeNS>true</legacyModeNS>
<robotSimType>gazebo_ros_control/DefaultRobotHWSim</robotSimType>
<!--robotNamespace>/racecar</robotNamespace--> <!-- by spx, do not use absolute namespace-->
</plugin>
</gazebo>
这是xacro中的一段，用了gazebo_ros_control的plugin，不要设置namespace为/racecar这种绝对路径，否则launch文件里给这个模型的group ns就只能是racecar，无法打开多个模型了。
下面给一个打开两个racecar的xacro文件的示例，注意robot_description不能加后缀，不同的robot因为在不同的命名空间里，不存在robot_description冲突。其实spawn_urdf后面也不用区分ID。
<launch>
<arg name="world_path" default="$(find uavros_gazebo)/worlds/lawn.world" />
<arg name="vehicle" default="iris" />
<include file="$(find gazebo_ros)/launch/empty_world.launch">
<!--arg name="world_name" value="$(arg world_path)"/-->
</include>
<group ns="ugv3">
<arg name="ID" value="3"/>
<arg name="x_pos" default="0"/>
<arg name="y_pos" default="0"/>
<arg name="z_pos" default="0"/>
<arg name="yaw" default="0"/>
<!-- 在gazebo中加载机器人模型-->
<param name="robot_description" command="$(find xacro)/xacro --inorder '$(find uavros_gazebo)/models/racecar_description/urdf/racecar.urdf.xacro'"/> <!--do not name as 'robot_description_3".etc-->
<node name="spawn_urdf_$(arg ID)" pkg="gazebo_ros" type="spawn_model" args="-urdf -model racecar$(arg ID) -x $(arg x_pos) -y $(arg y_pos) -z $(arg z_pos) -Y $(arg yaw) -param robot_description"/>
<param name ="racecarID" value="$(arg ID)"/>
<node pkg="uavros_gazebo" type="racecar_gazebo_odometry.py" name="racecar_gazebo_odometry" output="screen">
</node>
<!-- 从yaml文件加载联合控制器的参数 -->
<rosparam file="$(find uavros_gazebo)/config/racecar_config/ctrl.yaml" command="load"/>
<!-- 加载控制器 spawner -->
<node name="controller_manager" pkg="controller_manager" type="spawner"
respawn="false" output="screen"
args="left_rear_wheel_velocity_controller right_rear_wheel_velocity_controller
left_front_wheel_velocity_controller right_front_wheel_velocity_controller
left_steering_hinge_position_controller right_steering_hinge_position_controller
joint_state_controller"/>
<node pkg="uavros_gazebo" type="servo_commands.py" name="servo_commands" output="screen">
</node>
</group>
<group ns="ugv4">
<arg name="ID" value="4"/>
<arg name="x_pos" default="1"/>
<arg name="y_pos" default="0"/>
<arg name="z_pos" default="0"/>
<arg name="yaw" default="0"/>
<!-- 在gazebo中加载机器人模型-->
<param name="robot_description" command="$(find xacro)/xacro --inorder '$(find uavros_gazebo)/models/racecar_description/urdf/racecar.urdf.xacro'"/> <!--do not name as 'robot_description_1".etc-->
<node name="spawn_urdf_$(arg ID)" pkg="gazebo_ros" type="spawn_model" args="-urdf -model racecar$(arg ID) -x $(arg x_pos) -y $(arg y_pos) -z $(arg z_pos) -Y $(arg yaw) -param robot_description"/>
<param name ="racecarID" value="$(arg ID)"/>
<node pkg="uavros_gazebo" type="racecar_gazebo_odometry.py" name="racecar_gazebo_odometry" output="screen">
</node>
<!-- 从yaml文件加载联合控制器的参数 -->
<rosparam file="$(find uavros_gazebo)/config/racecar_config/ctrl.yaml" command="load"/>
<!-- 加载控制器 spawner -->
<node name="controller_manager" pkg="controller_manager" type="spawner"
respawn="false" output="screen"
args="left_rear_wheel_velocity_controller right_rear_wheel_velocity_controller
left_front_wheel_velocity_controller right_front_wheel_velocity_controller
left_steering_hinge_position_controller right_steering_hinge_position_controller
joint_state_controller"/>
<node pkg="uavros_gazebo" type="servo_commands.py" name="servo_commands" output="screen">
</node>
</group>
</launch>
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