Usage:
./ur_gazebo/scripts/gazebo_starter.sh
(This is a hack -- Gazebo must be paused initially to set the robot joints. See https://answers.ros.org/question/248178/can-i-set-initial-joint-positions-in-gazebomoveit-via-configuration/ )
Copy custom sensor models from ur_gazebo/models//.sdf to ~/.gazebo/models//.sdf
To use with the SpaceNavigator, disable Gazebo's link to the SpaceNavigator: