simulate dawn on the Dune 2000 shellmap

mods/d2k/maps/shellmap/map.yaml

@@ -127,6 +127,7 @@ Rules:
 			Scripts: shellmap.lua
 		MusicPlaylist:
 			StartingMusic: score
+		GlobalLightingPaletteEffect:
 	rockettower:
 		Power:
 			Amount: 100

mods/d2k/maps/shellmap/shellmap.lua

@@ -0,0 +1,26 @@
+WorldLoaded = function()
+	red = 0.95
+	green = 0.85
+	blue = 1.25
+	ambient = 0.5
+end
+
+Tick = function()
+	if (red < 1.0) then
+		red = red + 0.001
+	end
+
+	if (green < 1.0) then
+		green = green + 0.001
+	end
+
+	if (blue > 1.0) then
+		blue = blue - 0.001
+	end
+
+	if (ambient < 1.0) then
+		ambient = ambient + 0.001
+	end
+
+	Effect.ChangeLighting(red, green, blue, ambient)
+end