(sector
(name "main")
(ambient-light 1 1 1)
+ (background
+ (speed 0.5)
+ (image "images/background/nightsky_middle.png")
+ (image-top "images/background/nightsky_top.png")
+ (image-bottom "images/background/nightsky_bottom.png")
+
+)
(camera
(mode "normal")
)