Starts work on unbreaking CanPass()

code/game/machinery/OpTable.dm

@@ -48,13 +48,10 @@
 		qdel(src)
 	return
 
-/obj/machinery/optable/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-	if(air_group || (height==0)) return 1
-
+/obj/machinery/optable/CanPass(atom/movable/mover, turf/target)
 	if(istype(mover) && mover.checkpass(PASSTABLE))
-		return 1
-	else
-		return 0
+		return TRUE
+	return FALSE
 
 /obj/machinery/optable/MouseDrop_T(obj/O as obj, mob/user as mob)
 

code/game/machinery/doors/airlock.dm

@@ -750,7 +750,7 @@ About the new airlock wires panel:
 			if (user)
 				src.attack_ai(user)
 
-/obj/machinery/door/airlock/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
+/obj/machinery/door/airlock/CanPass(atom/movable/mover, turf/target)
 	if (src.isElectrified())
 		if (istype(mover, /obj/item))
 			var/obj/item/i = mover

code/game/machinery/doors/blast_door.dm

@@ -259,12 +259,14 @@
 	if(stat & BROKEN)
 		stat &= ~BROKEN
 
-
-/obj/machinery/door/blast/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-	if(air_group) return 1
+/*
+// This replicates the old functionality coded into CanPass() for this object, however it appeared to have made blast doors not airtight.
+// If for some reason this is actually needed for something important, uncomment this.
+/obj/machinery/door/blast/CanZASPass(turf/T, is_zone)
+	if(is_zone)
+		return TRUE
 	return ..()
-
-
+*/
 
 // SUBTYPE: Regular
 // Your classical blast door, found almost everywhere.

code/game/machinery/doors/door.dm

@@ -9,6 +9,7 @@
 	anchored = 1
 	opacity = 1
 	density = 1
+	can_atmos_pass = ATMOS_PASS_DENSITY
 	layer = DOOR_OPEN_LAYER
 	var/open_layer = DOOR_OPEN_LAYER
 	var/closed_layer = DOOR_CLOSED_LAYER
@@ -135,13 +136,16 @@
 			else
 				do_animate("deny")
 
-/obj/machinery/door/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-	if(air_group) return !block_air_zones
+/obj/machinery/door/CanPass(atom/movable/mover, turf/target)
 	if(istype(mover) && mover.checkpass(PASSGLASS))
 		return !opacity
 	return !density
-
-
+/*
+/obj/machinery/door/CanZASPass(turf/T, is_zone)
+	if(is_zone)
+		return !block_air_zones
+	return ..()
+*/
 /obj/machinery/door/proc/bumpopen(mob/user as mob)
 	if(operating)	return
 	if(user.last_airflow > world.time - vsc.airflow_delay) //Fakkit

code/game/objects/structures/inflatable.dm

@@ -25,6 +25,7 @@
 	density = 1
 	anchored = 1
 	opacity = 0
+	can_atmos_pass = ATMOS_PASS_DENSITY
 
 	icon = 'icons/obj/inflatable.dmi'
 	icon_state = "wall"
@@ -40,9 +41,6 @@
 	update_nearby_tiles()
 	return ..()
 
-/obj/structure/inflatable/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-	return 0
-
 /obj/structure/inflatable/bullet_act(var/obj/item/projectile/Proj)
 	var/proj_damage = Proj.get_structure_damage()
 	if(!proj_damage) return
@@ -168,9 +166,7 @@
 /obj/structure/inflatable/door/attack_hand(mob/user as mob)
 	return TryToSwitchState(user)
 
-/obj/structure/inflatable/door/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-	if(air_group)
-		return state
+/obj/structure/inflatable/door/CanPass(atom/movable/mover, turf/target)
 	if(istype(mover, /obj/effect/beam))
 		return !opacity
 	return !density