Adds some event/mapping props. (#40016)

code/modules/awaymissions/away_props.dm

@@ -0,0 +1,30 @@
+/obj/effect/oneway
+	name = "one way effect"
+	desc = "Only lets things in from it's dir."
+	icon = 'icons/effects/mapping_helpers.dmi'
+	icon_state = "field_dir"
+	invisibility = INVISIBILITY_MAXIMUM
+	anchored = TRUE
+
+/obj/effect/oneway/CanPass(atom/movable/mover, turf/target)
+	var/turf/T = get_turf(src)
+	var/turf/MT = get_turf(mover)
+	return ..() && (T == MT || get_dir(MT,T) == dir)
+
+
+/obj/effect/wind
+	name = "wind effect"
+	desc = "Creates pressure effect in it's direction. Use sparingly."
+	icon = 'icons/effects/mapping_helpers.dmi'
+	icon_state = "field_dir"
+	invisibility = INVISIBILITY_MAXIMUM
+	var/strength = 30
+
+/obj/effect/wind/Initialize()
+	. = ..()
+	START_PROCESSING(SSobj,src)
+
+/obj/effect/wind/process()
+	var/turf/open/T = get_turf(src)
+	if(istype(T))
+		T.consider_pressure_difference(get_step(T,dir),strength)

tgstation.dme

@@ -1346,6 +1346,7 @@
 #include "code\modules\atmospherics\machinery\portable\portable_atmospherics.dm"
 #include "code\modules\atmospherics\machinery\portable\pump.dm"
 #include "code\modules\atmospherics\machinery\portable\scrubber.dm"
+#include "code\modules\awaymissions\away_props.dm"
 #include "code\modules\awaymissions\bluespaceartillery.dm"
 #include "code\modules\awaymissions\capture_the_flag.dm"
 #include "code\modules\awaymissions\corpse.dm"