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<launch>
<group ns="turtlebot1">
<arg name="model" default="$(env TURTLEBOT3_MODEL)" doc="model type [burger, waffle]"/>
<arg name="x_pos" default="0.0"/>
<arg name="y_pos" default="2.0"/>
<arg name="z_pos" default="0.0"/>
default="0.0"/>
 
<param name="robot_description" command="$(find xacro)/xacro.py $(find turtlebot3_description)/urdf/turtlebot3_$(arg model).urdf.xacro" />
  
<node name="spawn_urdf_1" pkg="gazebo_ros" type="spawn_model" args="-urdf -model turtlebot3_burger -x $(arg x_pos) -y $(arg y_pos) -z $(arg z_pos) -param robot_description"/>
</group>robot_description" />
</group>
  
<group ns="turtlebot2">
<arg name="model" default="$(env TURTLEBOT3_MODEL)" doc="model type [burger, waffle]"/>
<arg name="x_pos_2" default="2.0"/>
<arg name="y_pos_2" default="0.0"/>
<arg name="z_pos_2" default="0.0"/>default="0.0"/>
 
 <param name="robot_description_2" command="$(find xacro)/xacro.py $(find turtlebot3_description)/urdf/turtlebot3_$(arg model).urdf.xacro" />
  
 <node name="spawn_urdf" pkg="gazebo_ros" type="spawn_model" args="-urdf -model turtlebot3_burger_2 -x $(arg x_pos_2) -y $(arg y_pos_2) -z $(arg z_pos_2) -param robot_description_2"/>
robot_description_2" />
 </group></group>
  
<include file="$(find gazebo_ros)/launch/empty_world.launch">
<arg name="world_name" value="$(find turtlebot3_gazebo)/models/empty.world"/>
<arg name="paused" value="false"/>
<arg name="use_sim_time" value="true"/>
<arg name="gui" value="true"/>
<arg name="headless" value="false"/>
<arg name="debug" value="false"/>
</include>
</launch></launch>