ros-galactic-desktop, ros-galactic-gazebo-ros, ros-galactic-gazebo-plugins
gazebo --verbose -s libgazebo_ros_factory.so world.sdf
python spawn_entity.py camera_array cam.sdf
ros2 service call /delete_entity gazebo_msgs/srv/DeleteEntity "{'name': 'camera_array'}"
python spawn_entity.py camera_array cam.sdf
First time spawning the camera_array, it will have a camera sensor attached with visualization enabled.
Repeating steps 3-4, usually just once, will cause the camera sensor visualization to disappear.