//    Instruction Example :      track.key.light.mode.set (long)


        screen.resolution.set (512,384)

        screen.resolution.set (512,384)

        @camera=camera.create (100,70,-200,0,0,0)
        @viewport=viewport.create ()
        viewport.camera.set (@viewport,@camera)
        viewport.display (@viewport)

        @cube=mesh.cube.create (100)

        @light=light.direct.create (200,150,-100,0,0,0)

        mesh.display (@cube)

        mesh.light.assign (@cube,@light)

        @track=track.create (TRACK_LOOP)
          track.key.set (0)
            track.key.light.mode.set (LIGHT_ATTENUATEON)
          track.key.set (1)
            track.key.light.mode.set (LIGHT_ATTENUATEOFF)
          track.key.set (2)
            track.key.light.mode.set (LIGHT_ATTENUATEON)
        track.end ()

        @sequence=sequence.play (@track,@light)

        screen.set (FRONT)
          text.display ("Press a key to exit.",CENTER,350)
        screen.end ()

        keyboard.wait ()

        script.stop ()