fixes some issues with planes; (#11266)

- blob
- hologram vs vehicle.

combines some layers into eachother.

code/_planes+layers.dm

@@ -83,13 +83,12 @@ What is the naming convention for planes or layers?
 	#define WIRE_LAYER				6
 	#define RUNE_LAYER				7
 	#define WIRE_TERMINAL_LAYER		8
-	#define NAV_BEACON_LAYER		9
+	#define ABOVE_TILE_LAYER		9
 	#define UNARY_PIPE_LAYER		10
-	#define MECH_RECHARGE_LAYER		11
+	#define MOUSETRAP_LAYER 		11
-	#define MOUSETRAP_LAYER 		12
+	#define FIREAXE_LOCKER_LAYER	12
-	#define FIREAXE_LOCKER_LAYER	13
+	#define BLOOD_LAYER				13
-	#define BLOOD_LAYER				14
+	#define WEED_LAYER				14
-	#define WEED_LAYER				15
 
 
 #define NOIR_BLOOD_PLANE 		-17		 	// For blood which is red, will appear to people under the influence of the noir colour matrix. -if changing this, make sure that the blood layer changes too.

code/game/gamemodes/blob/theblob.dm

@@ -421,20 +421,17 @@ var/list/blob_looks = list(
 			if(!spawning)
 				for(var/obj/effect/blob/B in orange(src,1))
 					if(B.spawning == 1)
-						anim(target = loc, a_icon = icon, flick_anim = "connect_spawn", sleeptime = 15, direction = get_dir(src,B), lay = layer+0.1, offX = -16, offY = -16)
+						anim(target = loc, a_icon = icon, flick_anim = "connect_spawn", sleeptime = 15, direction = get_dir(src,B), lay = layer, offX = -16, offY = -16,plane = plane)
 						spawn(8)
 							update_icon()
 					else if(!B.dying && !B.spawning)
 						if(spawnend)
-							anim(target = loc, a_icon = icon, flick_anim = "connect_spawn", sleeptime = 15, direction = get_dir(src,B), lay = layer+0.1, offX = -16, offY = -16)
+							anim(target = loc, a_icon = icon, flick_anim = "connect_spawn", sleeptime = 15, direction = get_dir(src,B), lay = layer, offX = -16, offY = -16,plane = plane)
 						else
-
 							if(istype(B,/obj/effect/blob/core))
 								overlays += image(icon,"connect",dir = get_dir(src,B))
 							else
-								var/num = rand(1,100)
+								overlays += image(icon,"connect",dir = get_dir(src,B))
-								num /= 10000
-								overlays += image(icon,"connect",dir = get_dir(src,B), layer = layer-num)
 
 			if(spawnend)
 				spawn(10)
@@ -443,7 +440,4 @@ var/list/blob_looks = list(
 			..()
 	else
 		if(health <= 15)
-			icon_state = "blob_damaged"
+			icon_state = "blob_damaged"
-			return
-
-

code/game/machinery/hologram.dm

@@ -37,6 +37,9 @@ var/const/HOLOPAD_MODE = 0
 	var/last_request = 0 //to prevent request spam. ~Carn
 	var/holo_range = 5 // Change to change how far the AI can move away from the holopad before deactivating.
 	flags = HEAR
+	plane = ABOVE_TURF_PLANE
+	layer = ABOVE_TILE_LAYER
+
 
 /obj/machinery/hologram/holopad/attack_hand(var/mob/living/carbon/human/user) //Carn: Hologram requests.
 	if(!istype(user))

code/game/machinery/navbeacon.dm

@@ -9,7 +9,7 @@
 	desc = "A radio beacon used for bot navigation."
 	level = 1		// underfloor
 	plane = ABOVE_TURF_PLANE
-	layer = NAV_BEACON_LAYER
+	layer = ABOVE_TILE_LAYER
 	anchored = 1
 
 	var/locked = 1		// true if controls are locked

code/game/mecha/mech_bay.dm

@@ -7,7 +7,7 @@
 	var/obj/mecha/recharging_mecha = null
 	var/capacitor_max = 0 //How much can be stored
 	var/capacitor_stored = 0 //How much is presently stored
-	layer = MECH_RECHARGE_LAYER
+	layer = ABOVE_TILE_LAYER
 	plane = ABOVE_TURF_PLANE
 	anchored = 1
 	density = 0

code/game/objects/structures/vehicles/vehicle.dm

@@ -29,7 +29,8 @@
 	var/max_health = 100
 	var/destroyed = 0
 	var/inertia_dir = 0
-	plane = MOB_PLANE
+	plane = ABOVE_HUMAN_PLANE
+	layer = VEHICLE_LAYER
 
 	var/can_spacemove = 0
 	var/ethereal = 0
@@ -89,7 +90,6 @@
 		return 1
 	if(mykey)
 		return user.is_holding_item(mykey)
-	return 0
 
 /obj/structure/bed/chair/vehicle/relaymove(var/mob/living/user, direction)
 	if(user.incapacitated()  || destroyed)
@@ -140,7 +140,6 @@
 	if(istype(src.loc, /turf/space) && (!src.Process_Spacemove(0, user)))
 		var/turf/space/S = src.loc
 		S.Entered(src)*/
-	return 0
 
 /obj/structure/bed/chair/vehicle/proc/Process_Spacemove(var/check_drift = 0, mob/user)
 
@@ -241,8 +240,10 @@
 /obj/structure/bed/chair/vehicle/handle_layer()
 	if(dir == SOUTH)
 		plane = ABOVE_HUMAN_PLANE
+		layer = VEHICLE_LAYER
 	else
 		plane = OBJ_PLANE
+		layer = ABOVE_OBJ_LAYER
 
 /obj/structure/bed/chair/vehicle/update_dir()
 	. = ..()

code/game/turfs/turf_flick_animations.dm

@@ -28,13 +28,15 @@
 //Does not require sleeptime, specifies for how long the animation should be allowed to exist before returning to pool
 //Does not require animation direction, but you can specify
 //Does not require a name
-proc/anim(turf/location as turf,target as mob|obj,a_icon,a_icon_state as text,flick_anim as text,sleeptime = 0,direction as num, name as text, lay as num, offX as num, offY as num, col as text, alph as num)
+proc/anim(turf/location as turf,target as mob|obj,a_icon,a_icon_state as text,flick_anim as text,sleeptime = 0,direction as num, name as text, lay as num, offX as num, offY as num, col as text, alph as num,plane as num)
 //This proc throws up either an icon or an animation for a specified amount of time.
 //The variables should be apparent enough.
 	if(!location && target)
 		location = get_turf(target)
 	if(location && !target)
 		target = location
+	if(!location && !target)
+		return
 	var/atom/movable/overlay/animation = getFromPool(/atom/movable/overlay, location)
 	if(name)
 		animation.name = name
@@ -49,6 +51,11 @@ proc/anim(turf/location as turf,target as mob|obj,a_icon,a_icon_state as text,fl
 		animation.layer = target:layer+1
 	else
 		animation.layer = lay
+	if(target && istype(target,/atom))
+		if(!plane)
+			animation.plane = target:plane
+		else
+			animation.plane = plane
 	if(offX)
 		animation.pixel_x = offX
 	if(offY)