ROS multi robot in Rviz and Gazebo demo
https://github.com/inaciose/multibot_description
roslaunch multibot_description world_1bot.launch
roslaunch multibot_description spawn_bot.launch ns:=sibot2 botcolor:=Blue x:=2
roslaunch multibot_description spawn_bot.launch ns:=sibot3 botcolor:=Red x:=3
roslaunch multibot_description world_2bot.launch