The Demo Camera is a special type of camera. It is used to record gameplay in your level and save it to a .DMO file. This .DMO file will play in the background at the main menu screen in the game.
Place an S[ViewingDistance,27]
at the location and height that you want the camera to be. In the game, this will appear as a floating camera. You may have to experiment with the ViewingDistance value to get it working properly. A value of 7000 works good. Don't worry about placing cameras in every area possible to make sure the entire gameplay is recorded. Any areas not visible by a camera will show up as a first-person camera view in the demo. Note: Don't let two cameras "see" each other. This will cause problems.