In unit 3 of URDF the section where launch file to launch urdf in gazebo is explained , there is statement as shown below
This first launch spawns the given URDF file into the given point in space, if a gazebo simulation is running. You can call this first launch through a second launch, passing the necessary arguments to it
so it means if i have to use this launch file in spawning a urdf in gazebo in my local machine i have start Gazebo before hand ?
If thats the case can i use this command to launch gazebo and the use the spawn.launch to spawn the urdf in gazebo in my local machine ?
roslaunch gazebo_ros empty_world.launch