Handle ice wetting differently. (Fixes #18)

code/ZAS/ZAS_Turfs.dm

@@ -52,7 +52,7 @@
 /turf/simulated/var/tmp/was_icy=0
 
 /turf/simulated/proc/update_visuals()
-	overlays = null
+	overlays.Cut()
 
 	var/siding_icon_state = return_siding_icon_state()
 	if(siding_icon_state)
@@ -61,9 +61,13 @@
 	// ONLY USED IF ZAS_SETTINGS SAYS SO.
 	var/datum/gas_mixture/model = return_air()
 	if(model.graphics & GRAPHICS_COLD)
-		if(!was_icy)
+		// Only make a few tiles ice at a time.
+		if(!was_icy) // && prob(10))
 			wet=3 // Custom ice
 			was_icy=1
+
+		// Only display ice on tiles that are actually icy.
+		if(was_icy)
 			var/o=""
 			//if(is_plating())
 			//	o="snowfloor_s"
@@ -73,32 +77,33 @@
 			if(o!="")
 				overlays += image('icons/turf/overlays.dmi',o)
 	else
-		if(was_icy)
-			wet=0
-			was_icy=0
-			if(prob(10))
-				wet = 1
+		// ALWAYS unset wet and icy.
+		wet=0
+		was_icy=0
+
+		// 10% chance of becoming wet on thawing
+		if(prob(10) && was_icy)
+			wet = 1
+			if(wet_overlay)
+				overlays -= wet_overlay
+				wet_overlay = null
+			wet_overlay = image('icons/effects/water.dmi',src,"wet_floor")
+			overlays += wet_overlay
+
+			spawn(800)
+				if (!istype(src)) return
+				if(wet >= 2) return
+				wet = 0
 				if(wet_overlay)
 					overlays -= wet_overlay
 					wet_overlay = null
-				wet_overlay = image('icons/effects/water.dmi',src,"wet_floor")
-				overlays += wet_overlay
 
-				spawn(800)
-					if (!istype(src)) return
-					if(wet >= 2) return
-					wet = 0
-					if(wet_overlay)
-						overlays -= wet_overlay
-						wet_overlay = null
 	if(model.graphics & GRAPHICS_PLASMA)
 		overlays.Add(plmaster)
-	else
-		overlays -= plmaster
+
 	if(model.graphics & GRAPHICS_N2O)
 		overlays.Add(slmaster)
-	else
-		overlays -= slmaster
+
 	//if(model.graphics & GRAPHICS_REAGENTS)
 	//	overlays.Add(slmaster/*rlmaster*/)