cd           Demonstration: a single,
             spinning compact disc.
drive2       Demonstration: two cars swerving on
             a low bridge.  This demonstration
             has multiple light sources and
             effects, which can be enabled
             interactively.
fishman      Demonstration: Shows that light
             sources and their corresponding
             volumes can be modified in real-time.
             This demonstration also makes
             heavy use of alpha channels for
             water effects.
scud         Demonstration: Scud Race world
             model.  Press the Z key to begin
             spinning around the track.  Z
             key again allows you to fly around
             the world with the arrow keys.
