Enable multi-sector lavaland. (#28358)

* Enable multi-sector lavaland.

* fix exclude ci paths

* remove old lavaland

* Lewc review and other cleanups, add GPS stuff

* rebuild tgui

* fix ash storm no eligible areas

* update test config, don't skip out on test level creation

* unfuck example config

* whoops

* add north entrances to legion arena for easier traversal

* TM config -- REVERT BEFORE MERGE

* Make SSweather work on traits directly

* flip order of procgen/ruin placement

* fix GPS

* fix budget in code

* clobber prod config for lavaland ruin budget for TM

* add relay to gulag

* some more guards for procgen

* separate relays

* make gulag and base one ruin

* bridge improvements

* actually remove gulag map

* make linter happy

* harden ruin placement against failing

Config changes made. Bypassing code ownership.

code/modules/admin/verbs/space_transitions.dm

@@ -34,8 +34,18 @@
 	if(choice == "No")
 		return
 
+	var/static/list/sectortypes = list(TRANSITION_TAG_SPACE, TRANSITION_TAG_LAVALAND)
+	var/sectortype = tgui_input_list(usr, "Please select sector type", "", sectortypes)
+
+	if(!(sectortype in sectortypes))
+		return
+
 	message_admins("[key_name_admin(usr)] made a space map")
 
-
-	GLOB.space_manager.map_as_turfs(get_turf(usr))
+	GLOB.space_manager.map_as_turfs(get_turf(usr), sectortype)
 	log_admin("[key_name(usr)] made a space map")
+
+
+/proc/save_lavaland_maps()
+	for(var/zlvl in levels_by_trait(ORE_LEVEL))
+		GLOB.maploader.save_map(locate(1, 1, zlvl), locate(world.maxx, world.maxy, zlvl), "lavaland_[zlvl]")

code/modules/hydroponics/grown/towercap.dm

@@ -184,14 +184,14 @@
 			var/obj/O = A
 			if(dangerous)
 				O.fire_act(1000, 500)
-			else 
+			else
 				O.temperature_expose(exposed_temperature = 400)
 		else if(isliving(A))
 			var/mob/living/L = A
 			if(dangerous)
 				L.adjust_fire_stacks(fire_stack_strength)
 				L.IgniteMob()
-			else 
+			else
 				L.adjust_bodytemperature(10, 310)
 
 /obj/structure/lightable/process()
@@ -288,4 +288,14 @@
 	qdel(src)
 	..()
 
+/obj/structure/lightable/torch/lava_bridge
+	anchored = TRUE
+
+/obj/structure/lightable/torch/lava_bridge/Initialize(mapload)
+	. = ..()
+	StartBurning()
+
+/obj/structure/lightable/torch/lava_bridge/CheckOxygen()
+	return TRUE // these load before SSair sets up atmos on Lavaland
+
 #undef MIN_OXY_IGNITE

code/modules/lavaland/caves_theme.dm

@@ -93,18 +93,18 @@ GLOBAL_LIST_INIT(caves_default_flora_spawns, list(
 
 /datum/caves_theme/proc/setup()
 	var/result = rustg_dbp_generate("[seed]", "[perlin_accuracy]", "[perlin_stamp_size]", "[world.maxx]", "[perlin_lower_range]", "[perlin_upper_range]")
-	var/z = level_name_to_num(MINING)
-	for(var/turf/T in block(1, 1, z, world.maxx, world.maxy, z))
-		if(!istype(get_area(T), /area/lavaland/surface/outdoors/unexplored))
-			continue
-		if(!istype(T, /turf/simulated/mineral))
-			continue
-		var/c = result[world.maxx * (T.y - 1) + T.x]
-		if(c == "1")
-			T.ChangeTurf(/turf/simulated/floor/plating/asteroid/basalt/lava_land_surface)
-			on_change(T)
+	for(var/zlvl in levels_by_trait(ORE_LEVEL))
+		for(var/turf/T in block(1, 1, zlvl, world.maxx, world.maxy, zlvl))
+			if(!istype(get_area(T), /area/lavaland/surface/outdoors/unexplored))
+				continue
+			if(!istype(T, /turf/simulated/mineral))
+				continue
+			var/c = result[world.maxx * (T.y - 1) + T.x]
+			if(c == "1")
+				T.ChangeTurf(/turf/simulated/floor/plating/asteroid/basalt/lava_land_surface)
+				on_change(T)
 
-		CHECK_TICK
+			CHECK_TICK
 
 /datum/caves_theme/proc/on_change(turf/T)
 	if(prob(2))
@@ -115,6 +115,8 @@ GLOBAL_LIST_INIT(caves_default_flora_spawns, list(
 /datum/caves_theme/proc/safe_replace(turf/T)
 	if(T.flags & NO_LAVA_GEN)
 		return FALSE
+	if(istype(T, /turf/template_noop))
+		return TRUE
 	if(!istype(get_area(T), /area/lavaland/surface/outdoors/unexplored))
 		return FALSE
 	if(istype(T, /turf/simulated/floor/chasm))

code/modules/lavaland/lavaland_theme.dm

@@ -5,6 +5,7 @@
 	var/turf/simulated/floor/primary_turf_type
 	/// Icon state of planet present on background of station Z-level
 	var/planet_icon_state
+	var/list/built_bridges
 	/// Icon for glass floors
 	var/primary_turf_type_icon
 
@@ -14,12 +15,75 @@
 	else if(!ispath(primary_turf_type))
 		stack_trace("Wrong turf type `[primary_turf_type.type]` in `[type]` lavaland theme")
 
+	built_bridges = list()
+
 /**
  * This proc should do all theme specific thing.
  * Now it only generates rivers, but it can do all stuff you desire.
  */
 /datum/lavaland_theme/proc/setup()
-	return
+	SHOULD_CALL_PARENT(TRUE)
+	setup_multisector()
+
+/datum/lavaland_theme/proc/setup_multisector()
+	var/bridge_diameter = 14
+	var/interval = 20
+	for(var/zlvl in levels_by_trait(ORE_LEVEL))
+		var/datum/space_level/level = GLOB.space_manager.get_zlev(zlvl)
+		if(!built_bridges["[zlvl]"])
+			built_bridges["[zlvl]"] = list()
+
+		for(var/d in level.neighbors)
+			if(d == Z_LEVEL_SOUTH)
+				var/datum/space_level/connected = level.get_connection(Z_LEVEL_SOUTH)
+				if(!built_bridges["[connected.zpos]"])
+					built_bridges["[connected.zpos]"] = list()
+				var/left_margin = TRANSITIONEDGE + 5
+				while(left_margin < world.maxx - TRANSITIONEDGE)
+					if(prob(50))
+						var/left_edge = rand(left_margin, left_margin + bridge_diameter)
+						var/loc = locate(left_edge, bridge_diameter / 2 + 1, level.zpos)
+						var/datum/map_template/ruin/lavaland/zlvl_bridge/template = GLOB.lavaland_zlvl_bridge_templates["lavaland_zlvl_bridge_vertical_1.dmm"]
+						template.load(loc, centered = TRUE)
+						// now make sure we line up another bridge on the linked map
+						loc = locate(left_edge, world.maxy - (bridge_diameter / 2) + 1, connected.zpos)
+						template.load(loc, centered = TRUE)
+
+					left_margin += interval
+
+				built_bridges["[zlvl]"]["[connected.zpos]"] = Z_LEVEL_SOUTH
+				built_bridges["[connected.zpos]"]["[zlvl]"] = Z_LEVEL_NORTH
+
+			else if(d == Z_LEVEL_EAST)
+				var/datum/space_level/connected = level.get_connection(Z_LEVEL_EAST)
+				if(!built_bridges["[connected.zpos]"])
+					built_bridges["[connected.zpos]"] = list()
+				var/north_margin = TRANSITIONEDGE + 5
+				while(north_margin < world.maxy - TRANSITIONEDGE)
+					if(prob(50))
+						var/north_edge = rand(north_margin, north_margin + bridge_diameter)
+						var/loc = locate(bridge_diameter / 2, north_edge, level.zpos)
+						var/datum/map_template/ruin/lavaland/zlvl_bridge/template = GLOB.lavaland_zlvl_bridge_templates["lavaland_zlvl_bridge_horizontal_1.dmm"]
+						template.load(loc, centered = TRUE)
+						// now make sure we line up another bridge on the linked map
+						loc = locate(world.maxx - (bridge_diameter / 2) + 1, north_edge, connected.zpos)
+						template.load(loc, centered = TRUE)
+
+					north_margin += interval
+
+				built_bridges["[zlvl]"]["[connected.zpos]"] = Z_LEVEL_EAST
+				built_bridges["[connected.zpos]"]["[zlvl]"] = Z_LEVEL_WEST
+
+/datum/lavaland_theme/proc/get_bridge_direction(z1, z2)
+	if(z1 == z2)
+		return null
+
+	if(("[z1]" in built_bridges) && ("[z2]" in built_bridges["[z1]"]))
+		return built_bridges["[z1]"]["[z2]"]
+	if(("[z2]" in built_bridges) && ("[z1]" in built_bridges["[z2]"]))
+		return built_bridges["[z2]"]["[z1]"]
+
+	return null
 
 /datum/lavaland_theme/lava
 	name = "lava"
@@ -28,8 +92,10 @@
 	primary_turf_type_icon = 'icons/turf/floors/lava.dmi'
 
 /datum/lavaland_theme/lava/setup()
-	var/datum/river_spawner/lava_spawner = new(level_name_to_num(MINING))
-	lava_spawner.generate()
+	. = ..()
+	for(var/zlvl in levels_by_trait(ORE_LEVEL))
+		var/datum/river_spawner/lava_spawner = new(zlvl)
+		lava_spawner.generate()
 
 /datum/lavaland_theme/plasma
 	name = "plasma"
@@ -38,9 +104,11 @@
 	primary_turf_type_icon = 'icons/turf/floors/liquidplasma.dmi'
 
 /datum/lavaland_theme/plasma/setup()
-	var/datum/river_spawner/spawner = new(level_name_to_num(MINING))
-	spawner.generate(nodes = 2)
-	spawner.generate(nodes = 2) // twice
+	. = ..()
+	for(var/zlvl in levels_by_trait(ORE_LEVEL))
+		var/datum/river_spawner/spawner = new(zlvl)
+		spawner.generate(nodes = 2)
+		spawner.generate(nodes = 2) // twice
 
 /datum/lavaland_theme/chasm
 	name = "chasm"
@@ -49,5 +117,7 @@
 	primary_turf_type_icon = 'icons/turf/floors/Chasms.dmi'
 
 /datum/lavaland_theme/chasm/setup()
-	var/datum/river_spawner/spawner = new(level_name_to_num(MINING), spread_prob_ = 10, spread_prob_loss_ = 5)
-	spawner.generate(nodes = 6, min_x = 50, min_y = 7, max_x = 250, max_y = 225)
+	. = ..()
+	for(var/zlvl in levels_by_trait(ORE_LEVEL))
+		var/datum/river_spawner/spawner = new(zlvl, spread_prob_ = 10, spread_prob_loss_ = 5)
+		spawner.generate(nodes = 6, min_x = 50, min_y = 7, max_x = 250, max_y = 225)

code/modules/mapping/mapping_helpers.dm

@@ -86,7 +86,7 @@
 	. = ..()
 
 	var/turf/T = get_turf(src)
-	if(istype(T) && T.z == level_name_to_num(MINING))
+	if(istype(T) && (T.z in levels_by_trait(ORE_LEVEL)))
 		var/obj/effect/landmark/river_waypoint/waypoint = new(T)
 		GLOB.river_waypoint_presets += waypoint
 

code/modules/shuttle/navigation_computer.dm

@@ -27,8 +27,9 @@
 	GLOB.navigation_computers += src
 	if(access_station)
 		jumpto_ports += list("nav_z[level_name_to_num(MAIN_STATION)]" = 1)
-	if(access_mining && GLOB.configuration.ruins.enable_lavaland)
-		jumpto_ports += list("nav_z[level_name_to_num(MINING)]" = 1)
+	if(access_mining)
+		for(var/zlvl in levels_by_trait(ORE_LEVEL))
+			jumpto_ports += list("nav_z[zlvl]" = 1)
 
 /obj/machinery/computer/camera_advanced/shuttle_docker/Destroy()
 	GLOB.navigation_computers -= src

code/modules/shuttle/shuttle.dm

@@ -572,11 +572,11 @@
 
 	//update mining and labor shuttle ash storm audio
 	if(mobile_port.id in list("mining", "laborcamp"))
-		var/mining_zlevel = level_name_to_num(MINING)
-		var/datum/weather/ash_storm/W = SSweather.get_weather(mining_zlevel, /area/lavaland/surface/outdoors)
-		if(W)
-			W.update_eligible_areas()
-			W.update_audio()
+		for(var/zlvl in levels_by_trait(ORE_LEVEL))
+			var/datum/weather/ash_storm/W = SSweather.get_weather(zlvl, /area/lavaland/surface/outdoors)
+			if(W)
+				W.update_eligible_areas()
+				W.update_audio()
 
 	mobile_port.unlockPortDoors(S1)
 

code/modules/space_management/level_traits.dm

@@ -72,10 +72,10 @@ GLOBAL_LIST_INIT(default_map_traits, list(CC_TRANSITION_CONFIG))
   *
   * Returns a list of zlevel numbers which can be accessed from travelling space naturally
   */
-/proc/get_all_linked_levels_zpos()
+/proc/get_all_linked_levels_zpos(transit_tag = TRANSITION_TAG_SPACE)
 	var/list/znums = list()
 	for(var/i in GLOB.space_manager.z_list)
 		var/datum/space_level/SL = GLOB.space_manager.z_list[i]
-		if(SL.linkage == CROSSLINKED)
+		if(SL.transition_tag == transit_tag && SL.linkage == CROSSLINKED)
 			znums |= SL.zpos
 	return znums

code/modules/space_management/space_level.dm

@@ -9,6 +9,7 @@
 	// It's UNAFFECTED by default because none of the space turfs are normally linked up
 	// so we don't need to rebuild transitions if an UNAFFECTED level is requested
 	var/linkage = UNAFFECTED
+	var/transition_tag
 	// # imaginary placements on the grid - these reflect the point it is linked to
 	var/xi
 	var/yi
@@ -17,22 +18,37 @@
 	var/list/transit_east = list()
 	var/list/transit_west = list()
 
+	var/transition_border_north
+	var/transition_border_east
+	var/transition_border_south
+	var/transition_border_west
+
 	// Init deferral stuff
 	var/dirt_count = 0
 	var/list/init_list = list()
 
-/datum/space_level/New(z, level_name, transition_type = SELFLOOPING, traits = list(BLOCK_TELEPORT))
+/datum/space_level/New(z, level_name, transition_type = SELFLOOPING, traits = list(BLOCK_TELEPORT), transition_tag_)
 	name = level_name
 	zpos = z
 	flags = traits
+	transition_tag = transition_tag_
+
+	set_transition_borders()
 	build_space_destination_arrays()
 	set_linkage(transition_type)
 	set_navbeacon()
 
+/datum/space_level/proc/set_transition_borders()
+	// can't set these in declaration because world.maxx/y are null for some reason
+	transition_border_north = TRANSITION_BORDER_NORTH
+	transition_border_east = TRANSITION_BORDER_EAST
+	transition_border_south = TRANSITION_BORDER_SOUTH
+	transition_border_west = TRANSITION_BORDER_WEST
+
 /datum/space_level/Destroy()
 	if(linkage == CROSSLINKED)
-		if(GLOB.space_manager.linkage_map)
-			remove_from_space_network(GLOB.space_manager.linkage_map)
+		if(GLOB.space_manager.linkage_maps[transition_tag])
+			remove_from_space_network(GLOB.space_manager.linkage_maps[transition_tag])
 
 	GLOB.space_manager.unbuilt_space_transitions -= src
 	GLOB.space_manager.z_list -= "[zpos]"
@@ -41,60 +57,60 @@
 /datum/space_level/proc/build_space_destination_arrays()
 	// We skip `add_to_transit` here because we want to skip the checks in order to save time
 	// Bottom border
-	for(var/turf/space/S in block(locate(1,1,zpos),locate(world.maxx,TRANSITION_BORDER_SOUTH,zpos)))
+	for(var/turf/S in block(locate(1,1,zpos),locate(world.maxx,transition_border_south,zpos)))
 		transit_south |= S
 
 	// Top border
-	for(var/turf/space/S in block(locate(1,world.maxy,zpos),locate(world.maxx,TRANSITION_BORDER_NORTH,zpos)))
+	for(var/turf/S in block(locate(1,world.maxy,zpos),locate(world.maxx,transition_border_north,zpos)))
 		transit_north |= S
 
 	// Left border
-	for(var/turf/space/S in block(locate(1,TRANSITION_BORDER_SOUTH + 1,zpos),locate(TRANSITION_BORDER_WEST,TRANSITION_BORDER_NORTH - 1,zpos)))
+	for(var/turf/S in block(locate(1, transition_border_south + 1, zpos), locate(transition_border_west, transition_border_north - 1, zpos)))
 		transit_west |= S
 
 	// Right border
-	for(var/turf/space/S in block(locate(TRANSITION_BORDER_EAST,TRANSITION_BORDER_SOUTH + 1,zpos),locate(world.maxx,TRANSITION_BORDER_NORTH - 1,zpos)))
+	for(var/turf/S in block(locate(transition_border_east, transition_border_south + 1, zpos),locate(world.maxx, transition_border_north - 1, zpos)))
 		transit_east |= S
 
-/datum/space_level/proc/add_to_transit(turf/space/S)
-	if(S.y <= TRANSITION_BORDER_SOUTH)
+/datum/space_level/proc/add_to_transit(turf/S)
+	if(S.y <= transition_border_south)
 		transit_south |= S
 		return
 
 	// Top border
-	if(S.y >= TRANSITION_BORDER_NORTH)
+	if(S.y >= transition_border_north)
 		transit_north |= S
 		return
 
 	// Left border
-	if(S.x <= TRANSITION_BORDER_WEST)
+	if(S.x <= transition_border_west)
 		transit_west |= S
 		return
 
 	// Right border
-	if(S.x >= TRANSITION_BORDER_EAST)
+	if(S.x >= transition_border_east)
 		transit_east |= S
 
-/datum/space_level/proc/remove_from_transit(turf/space/S)
-	if(S.y <= TRANSITION_BORDER_SOUTH)
+/datum/space_level/proc/remove_from_transit(turf/S)
+	if(S.y <= transition_border_south)
 		transit_south -= S
 		return
 
 	// Top border
-	if(S.y >= TRANSITION_BORDER_NORTH)
+	if(S.y >= transition_border_north)
 		transit_north -= S
 		return
 
 	// Left border
-	if(S.x <= TRANSITION_BORDER_WEST)
+	if(S.x <= transition_border_west)
 		transit_west -= S
 		return
 
 	// Right border
-	if(S.x >= TRANSITION_BORDER_EAST)
+	if(S.x >= transition_border_east)
 		transit_east -= S
 
-/datum/space_level/proc/apply_transition(turf/space/S)
+/datum/space_level/proc/apply_transition(turf/S)
 	if(src in GLOB.space_manager.unbuilt_space_transitions)
 		return // Let the space manager handle this one
 	switch(linkage)
@@ -124,8 +140,8 @@
 		return
 	// Remove ourselves from the linkage map if we were cross-linked
 	if(linkage == CROSSLINKED)
-		if(GLOB.space_manager.linkage_map)
-			remove_from_space_network(GLOB.space_manager.linkage_map)
+		if(GLOB.space_manager.linkage_maps[transition_tag])
+			remove_from_space_network(GLOB.space_manager.linkage_maps[transition_tag])
 
 	GLOB.space_manager.unbuilt_space_transitions |= src
 	linkage = transition_type
@@ -182,3 +198,11 @@ GLOBAL_LIST_INIT(cable_typecache, typecacheof(/obj/structure/cable))
 	SSmachines.setup_template_powernets(cables)
 	cables.Cut()
 	log_debug("Took [stop_watch(watch)]s")
+
+/datum/space_level/lavaland/set_transition_borders()
+	// really no reason why these need to be so large,
+	// especially since ruin placement is already constrained
+	transition_border_north = (world.maxy - 4)
+	transition_border_east = (world.maxx - 4)
+	transition_border_south = 3
+	transition_border_west = 3

code/modules/space_management/space_transition.dm

@@ -315,33 +315,45 @@
 // Separating this from initialization gives us time in which we can add more crosslink z levels
 // before we bake in all our connections
 /datum/zlev_manager/proc/route_linkage()
-	var/list/crosslinks = list()
+	var/list/linkage_networks = list()
+
 	var/datum/space_level/D
 	for(var/A in z_list)
 		D = z_list[A]
 		if(D.linkage == CROSSLINKED)
+			linkage_networks |= D.transition_tag
+
+	for(var/tag in linkage_networks)
+		var/list/crosslinks = list()
+		for(var/A in z_list)
+			D = z_list[A]
+			if(D.transition_tag != tag)
+				continue
 			crosslinks.Add(D)
 			D.reset_connections()
 
-	// We create an imaginary, square, grid, with dimensions that are
-	// twice the number of z levels, plus one, per side
+		// We create an imaginary, square, grid, with dimensions that are
+		// twice the number of z levels, plus one, per side
 
-	// This is big enough to hold a straight line from the center to any side
-	// `point_grid` is indexed as a 2 way matrix of these points
-	// `grid` is a flat list of these same above points
+		// This is big enough to hold a straight line from the center to any side
+		// `point_grid` is indexed as a 2 way matrix of these points
+		// `grid` is a flat list of these same above points
 
-	// Each point represents a possible z level position
-	if(linkage_map)
-		qdel(linkage_map)
-	linkage_map = new
+		// Each point represents a possible z level position
+		if(linkage_maps[tag])
+			qdel(linkage_maps[tag])
 
-	// Now, we pop entries in a random order from our list of space levels
-	// and assign its connections based on the grid
-	while(length(crosslinks))
-		D = pick(crosslinks)
-		crosslinks.Remove(D)
-		// Add it to our space grid
-		D.add_to_space_network(linkage_map)
+		var/datum/spacewalk_grid/new_grid = new
+
+		// Now, we pop entries in a random order from our list of space levels
+		// and assign its connections based on the grid
+		while(length(crosslinks))
+			D = pick(crosslinks)
+			crosslinks.Remove(D)
+			// Add it to our space grid
+			D.add_to_space_network(new_grid)
+
+		linkage_maps[tag] = new_grid
 
 // Used to loop through turfs in world, now just goes through each level's
 // transit turf cache
@@ -350,7 +362,7 @@
 	log_debug("Assigning space turf destinations...")
 	var/datum/space_level/D
 	var/datum/space_level/E
-	var/turf/space/S
+	var/turf/S
 	var/list/levels_to_rebuild = unbuilt_space_transitions
 
 	if(force_all_rebuilds)
@@ -392,6 +404,7 @@
 					S = B
 					E = D.get_connection(Z_LEVEL_NORTH)
 					S.set_transition_north(E.zpos)
+
 		unbuilt_space_transitions -= D
 
 	log_debug("Assigning space turf destinations complete. Took [stop_watch(timer)]s.")
@@ -402,10 +415,11 @@
 	setup_space_destinations(force_all_rebuilds = TRUE)
 
 // A debugging proc that expresses the map's shape as a bunch of turfs
-/datum/zlev_manager/proc/map_as_turfs(turf/center)
+/datum/zlev_manager/proc/map_as_turfs(turf/center, sector_type)
 	// size is odd
 	// -1, /2 to get distance from the center
 	// center - radius = bottom left coordinate
+	var/datum/spacewalk_grid/linkage_map = linkage_maps[sector_type]
 	var/datum/point/P
 	var/turf/our_spot
 	var/grid_desc = ""
@@ -415,8 +429,11 @@
 			our_spot = locate(center.x + i, center.y + j, center.z)
 			grid_desc = "([i],[j])"
 			if(!isnull(P))
-				our_spot = our_spot.ChangeTurf(/turf/simulated/floor/plating/snow)
-				grid_desc += ": Z level [P.spl.zpos]. "
+				if(P.spl.name == MAIN_STATION)
+					our_spot = our_spot.ChangeTurf(/turf/simulated/floor/engine)
+				else
+					our_spot = our_spot.ChangeTurf(/turf/simulated/floor/plating/snow)
+				grid_desc += ": Z level [P.spl.zpos]. Name: [P.spl.name] "
 				var/datum/space_level/up = P.spl.get_connection(Z_LEVEL_NORTH)
 				var/datum/space_level/down = P.spl.get_connection(Z_LEVEL_SOUTH)
 				var/datum/space_level/right = P.spl.get_connection(Z_LEVEL_EAST)

code/modules/space_management/zlevel_manager.dm

@@ -9,7 +9,7 @@ GLOBAL_DATUM_INIT(space_manager, /datum/zlev_manager, new())
 	// Levels that need their transitions rebuilt
 	var/list/unbuilt_space_transitions = list()
 
-	var/datum/spacewalk_grid/linkage_map
+	var/list/linkage_maps = list()
 	var/initialized = 0
 
 	var/list/areas_in_z = list()
@@ -108,7 +108,7 @@ GLOBAL_DATUM_INIT(space_manager, /datum/zlev_manager, new())
 
 // Increments the max z-level by one
 // For convenience's sake returns the z-level added
-/datum/zlev_manager/proc/add_new_zlevel(name, linkage = SELFLOOPING, traits = list(BLOCK_TELEPORT))
+/datum/zlev_manager/proc/add_new_zlevel(name, linkage = SELFLOOPING, traits = list(BLOCK_TELEPORT), transition_tag, level_type = /datum/space_level)
 	SEND_GLOBAL_SIGNAL(COMSIG_GLOB_NEW_Z, args)
 	if(name in levels_by_name)
 		throw EXCEPTION("Name already in use: [name]")
@@ -116,7 +116,7 @@ GLOBAL_DATUM_INIT(space_manager, /datum/zlev_manager, new())
 	SSai_controllers.on_max_z_changed()
 	var/our_z = world.maxz
 	milla_init_z(our_z)
-	var/datum/space_level/S = new /datum/space_level(our_z, name, transition_type = linkage, traits = traits)
+	var/datum/space_level/S = new level_type(our_z, name, transition_type = linkage, traits = traits, transition_tag_ = transition_tag)
 	levels_by_name[name] = S
 	z_list["[our_z]"] = S
 	return our_z

code/modules/telesci/gps.dm

@@ -78,6 +78,7 @@ GLOBAL_LIST_EMPTY(GPS_list)
 	SStgui.update_uis(src)
 
 /obj/item/gps/ui_data(mob/user)
+	var/list/mining_zlevels = levels_by_trait(ORE_LEVEL)
 	var/list/data = list()
 	if(emped)
 		data["emped"] = TRUE
@@ -106,13 +107,24 @@ GLOBAL_LIST_EMPTY(GPS_list)
 		var/turf/GT = get_turf(G)
 		if(isnull(GT) || !G.tracking || G == src)
 			continue
-		if((G.local || same_z) && (GT.z != T.z))
+
+		// If both signals are on lavaland, we don't skip them, because we want
+		// to have some indication of where lavaland sector bridges are, which
+		// we do by providing a directional arrow, without distance, in the GPS UI.
+		var/both_lavaland = (T.z in mining_zlevels) && (G.z in mining_zlevels)
+		if((!both_lavaland) && (G.local || same_z) && (GT.z != T.z))
 			continue
 
 		var/list/signal = list("tag" = G.gpstag, "area" = null, "position" = null)
 		if(!G.emped)
 			signal["area"] = get_area_name(G, TRUE)
 			signal["position"] = ATOM_COORDS(GT)
+
+			if(both_lavaland && T.z != GT.z)
+				var/bridge_direction = SSmapping.lavaland_theme.get_bridge_direction(GT.z, T.z)
+				if(bridge_direction)
+					signal["due"] = dir2angle(text2num(bridge_direction))
+
 		signals += list(signal)
 	data["signals"] = signals