Add fake ambient occlusion

code/game/objects/effects/effects.dm

@@ -16,6 +16,7 @@
 	return FALSE
 
 /obj/effect/decal
+	plane = FLOOR_PLANE
 	var/no_scoop = FALSE   //if it has this, don't let it be scooped up
 	var/no_clear = FALSE    //if it has this, don't delete it when its' scooped up
 	var/list/scoop_reagents = null

code/game/objects/effects/temporary_visuals/cult.dm

@@ -37,4 +37,5 @@
 
 /obj/effect/temp_visual/cult/turf/open/floor
 	icon_state = "floorglow"
-	duration = 5
+	duration = 5
+	plane = FLOOR_PLANE