functionality

code/modules/lighting/emissive_blocker.dm

@@ -0,0 +1,44 @@
+/**
+  * Internal atom that copies an appearance on to the blocker plane
+  *
+  * Copies an appearance vis render_target and render_source on to the emissive blocking plane.
+  * This means that the atom in question will block any emissive sprites.
+  * This should only be used internally. If you are directly creating more of these, you're
+  * almost guaranteed to be doing something wrong.
+  */
+/atom/movable/emissive_blocker
+	name = ""
+	plane = EMISSIVE_BLOCKER_PLANE
+	layer = EMISSIVE_BLOCKER_LAYER
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	//Why?
+	//render_targets copy the transform of the target as well, but vis_contents also applies the transform
+	//to what's in it. Applying RESET_TRANSFORM here makes vis_contents not apply the transform.
+	//Since only render_target handles transform we don't get any applied transform "stacking"
+	appearance_flags = RESET_TRANSFORM
+
+/atom/movable/emissive_blocker/Initialize(mapload, source)
+	. = ..()
+	verbs.Cut() //Cargo culting from lighting object, this maybe affects memory usage?
+
+	render_source = source
+
+/atom/movable/emissive_blocker/ex_act(severity)
+	return FALSE
+
+/atom/movable/emissive_blocker/singularity_act()
+	return
+
+/atom/movable/emissive_blocker/singularity_pull()
+	return
+
+/atom/movable/emissive_blocker/blob_act()
+	return
+
+/atom/movable/emissive_blocker/onTransitZ()
+	return
+
+//Prevents people from moving these after creation, because they shouldn't be.
+/atom/movable/emissive_blocker/forceMove(atom/destination, no_tp=FALSE, harderforce = FALSE)
+	if(harderforce)
+		return ..()

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

@@ -10,6 +10,8 @@
 	combat_flags = COMBAT_FLAGS_DEFAULT
 	status_flags = CANSTUN|CANKNOCKDOWN|CANUNCONSCIOUS|CANPUSH|CANSTAGGER
 
+	blocks_emissive = EMISSIVE_BLOCK_UNIQUE
+	
 	//Hair colour and style
 	var/hair_color = "000"
 	var/hair_style = "Bald"

code/modules/mob/living/carbon/monkey/monkey.dm

@@ -12,6 +12,7 @@
 	type_of_meat = /obj/item/reagent_containers/food/snacks/meat/slab/monkey
 	gib_type = /obj/effect/decal/cleanable/blood/gibs
 	unique_name = TRUE
+	blocks_emissive = EMISSIVE_BLOCK_UNIQUE
 	bodyparts = list(/obj/item/bodypart/chest/monkey, /obj/item/bodypart/head/monkey, /obj/item/bodypart/l_arm/monkey,
 					 /obj/item/bodypart/r_arm/monkey, /obj/item/bodypart/r_leg/monkey, /obj/item/bodypart/l_leg/monkey)
 	hud_type = /datum/hud/monkey

code/modules/mob/living/silicon/robot/robot.dm

@@ -10,6 +10,8 @@
 	has_limbs = 1
 	hud_type = /datum/hud/robot
 
+	blocks_emissive = EMISSIVE_BLOCK_UNIQUE
+
 	var/custom_name = ""
 	var/braintype = "Cyborg"
 	var/obj/item/robot_suit/robot_suit = null //Used for deconstruction to remember what the borg was constructed out of..

code/modules/mob/mob_defines.dm

@@ -8,6 +8,8 @@
 	pressure_resistance = 8
 	mouse_drag_pointer = MOUSE_ACTIVE_POINTER
 	throwforce = 10
+	blocks_emissive = EMISSIVE_BLOCK_GENERIC
+
 	var/lighting_alpha = LIGHTING_PLANE_ALPHA_VISIBLE
 	var/datum/mind/mind
 	var/list/datum/action/actions = list()