POLARIS: Fix regular mobs seeing when ghosts point at things.

* Fixed it by adding a facility by which code can check if a mob can logically see things present on another plane.

code/modules/mob/living/carbon/human/update_icons.dm

@@ -181,6 +181,9 @@ Please contact me on #coderbus IRC. ~Carn x
 		ma_compiled.transform = M
 		ma_compiled.layer = MOB_LAYER //VOREStation Edit. Unset laying layer. UNLEWD.
 
+	//4.5 Set layer to PLANE_WORLD to make sure its not magically FLOAT_PLANE due to byond madness
+	ma_compiled.plane = PLANE_WORLD
+
 	//5: Set appearance once
 	appearance = ma_compiled
 

code/modules/mob/mob.dm

@@ -94,7 +94,7 @@
 			var/mob/M = I
 			if(self_message && M==src)
 				M.show_message( self_message, 1, blind_message, 2)
-			else if(M.see_invisible >= invisibility) // Cannot view the invisible
+			else if(M.see_invisible >= invisibility && MOB_CAN_SEE_PLANE(M, plane)) // Cannot view the invisible
 				M.show_message( message, 1, blind_message, 2)
 			else if (blind_message)
 				M.show_message(blind_message, 2)
@@ -244,6 +244,7 @@
 
 	var/obj/P = new /obj/effect/decal/point(tile)
 	P.invisibility = invisibility
+	P.plane = plane
 	spawn (20)
 		if(P)
 			qdel(P)	// qdel

code/modules/mob/mob_defines.dm

@@ -35,7 +35,8 @@
 	var/obj/screen/wizard/instability/wiz_instability_display = null
 
 	var/datum/plane_holder/plane_holder = null
-	var/list/vis_enabled = null
+	var/list/vis_enabled = null		// List of vision planes that should be graphically visible (list of their VIS_ indexes).
+	var/list/planes_visible = null	// List of atom planes that are logically visible/interactable (list of actual plane numbers).
 
 	//spells hud icons - this interacts with add_spell and remove_spell
 	var/list/obj/screen/movable/spell_master/spell_masters = null

code/modules/mob/mob_planes.dm

@@ -51,6 +51,11 @@
 		var/list/subplanes = PM.sub_planes
 		for(var/SP in subplanes)
 			set_vis(which = SP, state = state)
+	var/plane = PM.plane
+	if(state && !(plane in my_mob.planes_visible))
+		LAZYADD(my_mob.planes_visible, plane)
+	else if(!state && (plane in my_mob.planes_visible))
+		LAZYREMOVE(my_mob.planes_visible, plane)
 
 /datum/plane_holder/proc/set_desired_alpha(var/which = null, var/new_alpha)
 	ASSERT(which)
@@ -137,7 +142,6 @@
 	plane = PLANE_GHOSTS
 	desired_alpha = 127 //When enabled, they're like half-transparent
 
-
 //'Normal'ness						 v								 v								 v
 //Various types of colorblindness	R2R		R2G		R2B		G2R		G2G		G2B		B2R		B2G		B2B
 #define MATRIX_Monochromia 		list(0.33,	0.33,	0.33,	0.59,	0.59,	0.59,	0.11,	0.11,	0.11)