woo yeah yeah woo

_maps/RandomRuins/IceRuins/icemoon_surface_mining_site.dmm

@@ -16,7 +16,7 @@
 /turf/open/floor/wood,
 /area/ruin/unpowered)
 "d" = (
-/turf/open/openspace/icemoon,
+/turf/open/transparent/openspace/icemoon,
 /area/icemoon/surface/outdoors)
 "e" = (
 /obj/item/clothing/suit/hooded/explorer,

_maps/map_files/Snaxi/Snaxi.dmm

@@ -5169,7 +5169,7 @@
 /turf/open/floor/plasteel/dark,
 /area/hallway/secondary/exit/departure_lounge)
 "bum" = (
-/turf/open/openspace/icemoon,
+/turf/open/transparent/openspace/icemoon,
 /area/icemoon/surface/outdoors)
 "buF" = (
 /obj/machinery/light,
@@ -12388,7 +12388,7 @@
 /turf/open/floor/plasteel,
 /area/hallway/primary/port)
 "esY" = (
-/turf/open/openspace/icemoon,
+/turf/open/transparent/openspace/icemoon,
 /area/engine/atmos)
 "ets" = (
 /obj/machinery/atmospherics/components/unary/vent_pump/on{
@@ -34891,7 +34891,7 @@
 /turf/open/floor/plasteel,
 /area/engine/engineering)
 "rUd" = (
-/turf/open/openspace/icemoon,
+/turf/open/transparent/openspace/icemoon,
 /area/science/mixing)
 "rUl" = (
 /obj/structure/cable{
@@ -36338,7 +36338,7 @@
 /turf/open/floor/plasteel/white,
 /area/medical/medbay/central)
 "sTq" = (
-/turf/open/openspace/icemoon,
+/turf/open/transparent/openspace/icemoon,
 /area/engine/atmospherics_engine)
 "sTz" = (
 /obj/effect/turf_decal/bot_white,

_maps/map_files/debug/multiz.dmm

@@ -102,7 +102,7 @@
 /turf/open/floor/plasteel,
 /area/engine/gravity_generator)
 "au" = (
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/space)
 "av" = (
 /obj/structure/stairs{
@@ -1407,7 +1407,7 @@
 	},
 /area/hallway/secondary/service)
 "eC" = (
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/maintenance/department/bridge)
 "eD" = (
 /obj/effect/turf_decal/stripes/asteroid/line{
@@ -1542,7 +1542,7 @@
 /turf/open/floor/plating,
 /area/space)
 "iu" = (
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/hallway/secondary/service)
 "iK" = (
 /turf/open/floor/plasteel{
@@ -1593,7 +1593,7 @@
 	},
 /area/hallway/secondary/service)
 "nx" = (
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/space/nearstation)
 "nz" = (
 /obj/machinery/light{
@@ -1633,7 +1633,7 @@
 /turf/open/floor/plating,
 /area/maintenance/department/bridge)
 "qo" = (
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/engine/storage)
 "qR" = (
 /obj/effect/turf_decal/stripes/white/line{
@@ -1646,7 +1646,7 @@
 /obj/machinery/light{
 	dir = 8
 	},
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/engine/storage)
 "sh" = (
 /turf/open/floor/plasteel{
@@ -1746,7 +1746,7 @@
 /area/construction)
 "Bk" = (
 /obj/structure/grille,
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/space/nearstation)
 "Bm" = (
 /obj/machinery/light{
@@ -1876,7 +1876,7 @@
 "Ob" = (
 /obj/structure/lattice,
 /obj/structure/grille,
-/turf/open/openspace,
+/turf/open/transparent/openspace,
 /area/space/nearstation)
 "Og" = (
 /obj/machinery/airalarm/directional/north,

_maps/multiz_debug.json

@@ -2,5 +2,5 @@
     "map_name": "MultiZ Debug",
     "map_path": "map_files/debug",
     "map_file": "multiz.dmm",
-	"traits": [{"Up": 1}, {"Up": 1, "Down": -1}, {"Down": -1}]
+	"traits": [{"Up" : 1, "Linkage" : "Cross"}, {"Up" : 1, "Down" : -1, "Baseturf" : "/turf/open/transparent/openspace", "Linkage" : "Cross"}, {"Down" : -1, "Baseturf" : "/turf/open/transparent/openspace", "Linkage" : "Cross"}]
 	}

_maps/snaxi.json

@@ -33,7 +33,7 @@
          "Linkage":null,
          "Gravity":true,
          "Ice Ruins Underground":true,
-         "Baseturf":"/turf/open/openspace/icemoon"
+         "Baseturf":"/turf/open/transparent/openspace/icemoon"
       },
       {
          "Down":-1,

code/__DEFINES/is_helpers.dm

@@ -17,7 +17,7 @@ GLOBAL_LIST_INIT(turfs_without_ground, typecacheof(list(
 	/turf/open/chasm,
 	/turf/open/lava,
 	/turf/open/water,
-	/turf/open/openspace
+	/turf/open/transparent/openspace
 	)))
 
 #define isgroundlessturf(A) (is_type_in_typecache(A, GLOB.turfs_without_ground))
@@ -44,6 +44,8 @@ GLOBAL_LIST_INIT(turfs_without_ground, typecacheof(list(
 
 #define isplatingturf(A) (istype(A, /turf/open/floor/plating))
 
+#define istransparentturf(A) (istype(A, /turf/open/transparent))
+
 //Mobs
 #define isliving(A) (istype(A, /mob/living))
 

code/controllers/subsystem/mapping.dm

@@ -113,7 +113,7 @@ SUBSYSTEM_DEF(mapping)
 		// needs to be whitelisted for underground too so place_below ruins work
 		seedRuins(ice_ruins, CONFIG_GET(number/icemoon_budget), list(/area/icemoon/surface/outdoors/unexplored, /area/icemoon/underground/unexplored), ice_ruins_templates)
 		for (var/ice_z in ice_ruins)
-			spawn_rivers(ice_z, 4, /turf/open/openspace/icemoon, /area/icemoon/surface/outdoors/unexplored/rivers)
+			spawn_rivers(ice_z, 4, /turf/open/transparent/openspace/icemoon, /area/icemoon/surface/outdoors/unexplored/rivers)
 
 	var/list/ice_ruins_underground = levels_by_trait(ZTRAIT_ICE_RUINS_UNDERGROUND)
 	if (ice_ruins_underground.len)

code/game/objects/structures/stairs.dm

@@ -3,7 +3,7 @@
 #define STAIR_TERMINATOR_YES 2
 
 // dir determines the direction of travel to go upwards (due to lack of sprites, currently only 1 and 2 make sense)
-// stairs require /turf/open/openspace as the tile above them to work
+// stairs require /turf/open/transparent/openspace as the tile above them to work
 // multiple stair objects can be chained together; the Z level transition will happen on the final stair object in the chain
 
 /obj/structure/stairs
@@ -12,7 +12,7 @@
 	icon_state = "stairs"
 	anchored = TRUE
 
-	var/force_open_above = FALSE // replaces the turf above this stair obj with /turf/open/openspace
+	var/force_open_above = FALSE // replaces the turf above this stair obj with /turf/open/transparent/openspace
 	var/terminator_mode = STAIR_TERMINATOR_AUTOMATIC
 	var/turf/listeningTo
 
@@ -95,20 +95,20 @@
 /obj/structure/stairs/proc/build_signal_listener()
 	if(listeningTo)
 		UnregisterSignal(listeningTo, COMSIG_TURF_MULTIZ_NEW)
-	var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+	var/turf/open/transparent/openspace/T = get_step_multiz(get_turf(src), UP)
 	RegisterSignal(T, COMSIG_TURF_MULTIZ_NEW, .proc/on_multiz_new)
 	listeningTo = T
 
 /obj/structure/stairs/proc/force_open_above()
-	var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+	var/turf/open/transparent/openspace/T = get_step_multiz(get_turf(src), UP)
 	if(T && !istype(T))
-		T.ChangeTurf(/turf/open/openspace, flags = CHANGETURF_INHERIT_AIR)
+		T.ChangeTurf(/turf/open/transparent/openspace, flags = CHANGETURF_INHERIT_AIR)
 
 /obj/structure/stairs/proc/on_multiz_new(turf/source, dir)
 	if(dir == UP)
-		var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+		var/turf/open/transparent/openspace/T = get_step_multiz(get_turf(src), UP)
 		if(T && !istype(T))
-			T.ChangeTurf(/turf/open/openspace, flags = CHANGETURF_INHERIT_AIR)
+			T.ChangeTurf(/turf/open/transparent/openspace, flags = CHANGETURF_INHERIT_AIR)
 
 /obj/structure/stairs/intercept_zImpact(atom/movable/AM, levels = 1)
 	. = ..()

code/game/turfs/openspace/openspace.dm

@@ -11,66 +11,47 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 	mouse_opacity 	= MOUSE_OPACITY_TRANSPARENT
 	layer           = SPLASHSCREEN_LAYER
 
-/turf/open/openspace
+/turf/open/transparent/openspace
 	name = "open space"
 	desc = "Watch your step!"
 	icon_state = "transparent"
-	baseturfs = /turf/open/openspace
+	baseturfs = /turf/open/transparent/openspace
 	CanAtmosPassVertical = ATMOS_PASS_YES
 	//mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	var/can_cover_up = TRUE
 	var/can_build_on = TRUE
 
-/turf/open/openspace/debug/update_multiz()
+/turf/open/transparent/openspace/airless
+	initial_gas_mix = AIRLESS_ATMOS
+
+/turf/open/transparent/openspace/debug/update_multiz()
 	..()
 	return TRUE
 
-/turf/open/openspace/Initialize() // handle plane and layer here so that they don't cover other obs/turfs in Dream Maker
+///No bottom level for openspace.
+/turf/open/transparent/openspace/show_bottom_level()
+	return FALSE
+
+/turf/open/transparent/openspace/Initialize() // handle plane and layer here so that they don't cover other obs/turfs in Dream Maker
 	. = ..()
-	plane = OPENSPACE_PLANE
-	layer = OPENSPACE_LAYER
+
 	vis_contents += GLOB.openspace_backdrop_one_for_all //Special grey square for projecting backdrop darkness filter on it.
-	return INITIALIZE_HINT_LATELOAD
 
-/turf/open/openspace/LateInitialize()
-	update_multiz(TRUE, TRUE)
+/turf/open/transparent/openspace/can_have_cabling()
+	if(locate(/obj/structure/lattice/catwalk, src))
+		return TRUE
+	return FALSE
 
-/turf/open/openspace/Destroy()
-	vis_contents.len = 0
-	return ..()
-
-/turf/open/openspace/update_multiz(prune_on_fail = FALSE, init = FALSE)
-	. = ..()
-	var/turf/T = below()
-	if(!T)
-		vis_contents.len = 0
-		if(prune_on_fail)
-			ChangeTurf(/turf/open/floor/plating)
-		return FALSE
-	if(init)
-		vis_contents += T
+/turf/open/transparent/openspace/zAirIn()
 	return TRUE
 
-/turf/open/openspace/multiz_turf_del(turf/T, dir)
-	if(dir != DOWN)
-		return
-	update_multiz()
-
-/turf/open/openspace/multiz_turf_new(turf/T, dir)
-	if(dir != DOWN)
-		return
-	update_multiz()
-
-/turf/open/openspace/zAirIn()
+/turf/open/transparent/openspace/zAirOut()
 	return TRUE
 
-/turf/open/openspace/zAirOut()
+/turf/open/transparent/openspace/zPassIn(atom/movable/A, direction, turf/source)
 	return TRUE
 
-/turf/open/openspace/zPassIn(atom/movable/A, direction, turf/source)
-	return TRUE
-
-/turf/open/openspace/zPassOut(atom/movable/A, direction, turf/destination)
+/turf/open/transparent/openspace/zPassOut(atom/movable/A, direction, turf/destination)
 	if(A.anchored)
 		return FALSE
 	for(var/obj/O in contents)
@@ -78,13 +59,13 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 			return FALSE
 	return TRUE
 
-/turf/open/openspace/proc/CanCoverUp()
+/turf/open/transparent/openspace/proc/CanCoverUp()
 	return can_cover_up
 
-/turf/open/openspace/proc/CanBuildHere()
+/turf/open/transparent/openspace/proc/CanBuildHere()
 	return can_build_on
 
-/turf/open/openspace/attackby(obj/item/C, mob/user, params)
+/turf/open/transparent/openspace/attackby(obj/item/C, mob/user, params)
 	..()
 	if(!CanBuildHere())
 		return
@@ -98,14 +79,14 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 		if(L)
 			if(R.use(1))
 				to_chat(user, "<span class='notice'>You construct a catwalk.</span>")
-				playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+				playsound(src, 'sound/weapons/genhit.ogg', 50, TRUE)
 				new/obj/structure/lattice/catwalk(src)
 			else
 				to_chat(user, "<span class='warning'>You need two rods to build a catwalk!</span>")
 			return
 		if(R.use(1))
 			to_chat(user, "<span class='notice'>You construct a lattice.</span>")
-			playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+			playsound(src, 'sound/weapons/genhit.ogg', 50, TRUE)
 			ReplaceWithLattice()
 		else
 			to_chat(user, "<span class='warning'>You need one rod to build a lattice.</span>")
@@ -118,7 +99,7 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 			var/obj/item/stack/tile/plasteel/S = C
 			if(S.use(1))
 				qdel(L)
-				playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+				playsound(src, 'sound/weapons/genhit.ogg', 50, TRUE)
 				to_chat(user, "<span class='notice'>You build a floor.</span>")
 				PlaceOnTop(/turf/open/floor/plating, flags = CHANGETURF_INHERIT_AIR)
 			else
@@ -126,7 +107,7 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 		else
 			to_chat(user, "<span class='warning'>The plating is going to need some support! Place metal rods first.</span>")
 
-/turf/open/openspace/rcd_vals(mob/user, obj/item/construction/rcd/the_rcd)
+/turf/open/transparent/openspace/rcd_vals(mob/user, obj/item/construction/rcd/the_rcd)
 	if(!CanBuildHere())
 		return FALSE
 
@@ -139,7 +120,7 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 				return list("mode" = RCD_FLOORWALL, "delay" = 0, "cost" = 3)
 	return FALSE
 
-/turf/open/openspace/rcd_act(mob/user, obj/item/construction/rcd/the_rcd, passed_mode)
+/turf/open/transparent/openspace/rcd_act(mob/user, obj/item/construction/rcd/the_rcd, passed_mode)
 	switch(passed_mode)
 		if(RCD_FLOORWALL)
 			to_chat(user, "<span class='notice'>You build a floor.</span>")
@@ -147,12 +128,12 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 			return TRUE
 	return FALSE
 
-/turf/open/openspace/icemoon
+/turf/open/transparent/openspace/icemoon
 	name = "ice chasm"
-	baseturfs = /turf/open/openspace/icemoon
-	can_cover_up = FALSE
-	can_build_on = FALSE
+	baseturfs = /turf/open/transparent/openspace/icemoon
+	can_cover_up = TRUE
+	can_build_on = TRUE
 	initial_gas_mix = ICEMOON_DEFAULT_ATMOS
 
-/turf/open/openspace/icemoon/can_zFall(atom/movable/A, levels = 1, turf/target)
+/turf/open/transparent/openspace/icemoon/can_zFall(atom/moveable/A, levels = 1, turf/target)
 	return TRUE

code/game/turfs/openspace/transparent.dm

@@ -0,0 +1,73 @@
+/turf/open/transparent
+	baseturfs = /turf/open/transparent/openspace
+	intact = FALSE //this means wires go on top
+
+/turf/open/transparent/Initialize() // handle plane and layer here so that they don't cover other obs/turfs in Dream Maker
+	. = ..()
+	plane = OPENSPACE_PLANE
+	layer = OPENSPACE_LAYER
+
+	return INITIALIZE_HINT_LATELOAD
+
+/turf/open/transparent/LateInitialize()
+	update_multiz(TRUE, TRUE)
+
+/turf/open/transparent/Destroy()
+	vis_contents.len = 0
+	return ..()
+
+/turf/open/transparent/update_multiz(prune_on_fail = FALSE, init = FALSE)
+	. = ..()
+	var/turf/T = below()
+	if(!T)
+		vis_contents.len = 0
+		if(!show_bottom_level() && prune_on_fail) //If we cant show whats below, and we prune on fail, change the turf to plating as a fallback
+			ChangeTurf(/turf/open/floor/plating, flags = CHANGETURF_INHERIT_AIR)
+		return FALSE
+	if(init)
+		vis_contents += T
+	return TRUE
+
+/turf/open/transparent/multiz_turf_del(turf/T, dir)
+	if(dir != DOWN)
+		return
+	update_multiz()
+
+/turf/open/transparent/multiz_turf_new(turf/T, dir)
+	if(dir != DOWN)
+		return
+	update_multiz()
+
+///Called when there is no real turf below this turf
+/turf/open/transparent/proc/show_bottom_level()
+	var/turf/path = SSmapping.level_trait(z, ZTRAIT_BASETURF) || /turf/open/space
+	if(!ispath(path))
+		path = text2path(path)
+		if(!ispath(path))
+			warning("Z-level [z] has invalid baseturf '[SSmapping.level_trait(z, ZTRAIT_BASETURF)]'")
+			path = /turf/open/space
+	var/mutable_appearance/underlay_appearance = mutable_appearance(initial(path.icon), initial(path.icon_state), layer = TURF_LAYER, plane = PLANE_SPACE)
+	underlays += underlay_appearance
+	return TRUE
+
+
+/turf/open/transparent/glass
+	name = "Glass floor"
+	desc = "Dont jump on it, or do, I'm not your mom."
+	icon = 'icons/turf/floors/glass.dmi'
+	icon_state = "floor_glass"
+	smooth = SMOOTH_MORE
+	canSmoothWith = list(/turf/open/transparent/glass, /turf/open/transparent/glass/reinforced)
+	footstep = FOOTSTEP_PLATING
+	barefootstep = FOOTSTEP_HARD_BAREFOOT
+	clawfootstep = FOOTSTEP_HARD_CLAW
+	heavyfootstep = FOOTSTEP_GENERIC_HEAVY
+
+/turf/open/transparent/glass/Initialize()
+	icon_state = "" //Prevent the normal icon from appearing behind the smooth overlays
+	return ..()
+
+/turf/open/transparent/glass/reinforced
+	name = "Reinforced glass floor"
+	desc = "Do jump on it, it can take it."
+	icon = 'icons/turf/floors/reinf_glass.dmi'

tgstation.dme

@@ -1296,6 +1296,7 @@
 #include "code\game\turfs\open.dm"
 #include "code\game\turfs\turf.dm"
 #include "code\game\turfs\openspace\openspace.dm"
+#include "code\game\turfs\openspace\transparent.dm"
 #include "code\game\turfs\simulated\chasm.dm"
 #include "code\game\turfs\simulated\dirtystation.dm"
 #include "code\game\turfs\simulated\floor.dm"