optimize nether porticles

mods/ITEMS/mcl_portals/portal_nether.lua

@@ -29,6 +29,9 @@ if minetest.features.use_texture_alpha_string_modes then
 	PORTAL_ALPHA = nil
 end
 
+local PORTICLE_DISTANCE = 15 --how far to send particle spawners for the portalnodes
+local porticlespawners = {}
+
 -- Table of objects (including players) which recently teleported by a
 -- Nether portal. Those objects have a brief cooloff period before they
 -- can teleport again. This prevents annoying back-and-forth teleportation.
@@ -59,6 +62,65 @@ local function nether_to_overworld(x)
 	return LIMIT - math.abs(((x * OVERWORLD_TO_NETHER_SCALE + LIMIT) % (LIMIT*4)) - (LIMIT*2))
 end
 
+local function remove_particlespawner_at_position(playername,pos)
+	if not porticlespawners[minetest.pos_to_string(pos)] or porticlespawners[minetest.pos_to_string(pos)][playername] == nil then return end
+	minetest.delete_particlespawner(porticlespawners[minetest.pos_to_string(pos)][playername],playername)
+	porticlespawners[minetest.pos_to_string(pos)][playername]=nil
+end
+
+local function add_particlespawner_at_position(player,pos,node)
+	if not porticlespawners[minetest.pos_to_string(pos)] then porticlespawners[minetest.pos_to_string(pos)] = {} end
+	if porticlespawners[minetest.pos_to_string(pos)][player:get_player_name()] ~= nil then return end
+	porticlespawners[minetest.pos_to_string(pos)][player:get_player_name()]=minetest.add_particlespawner({
+		amount = node_particles_allowed_level + 1,
+		minpos = vector.add(pos, vector.new(-3,-3,-3)),
+		maxpos = vector.add(pos, vector.new(3,3,3)),
+		minvel = vector.new(-0.5,-0.5,-0.5),
+		maxvel = vector.new(0.5,0.5,0.5),
+		minacc = vector.new(-0.5,-0.5,-0.5),
+		maxacc = vector.new(0.5,0.5,0.5),
+		minexptime = 0.1,
+		maxexptime = 2.4,
+		minsize = 0.3,
+		maxsize = 1.8,
+		time=0,
+		collisiondetection = false,
+		texture = "mcl_particles_nether_portal.png",
+		playername = player:get_player_name(),
+	})
+end
+
+local function add_porticlespawners(pos,node)
+	--Add particlespawners for all players in range
+	for _,obj in pairs(minetest.get_connected_players()) do
+		if vector.distance(obj:get_pos(),pos) <= PORTICLE_DISTANCE then
+			add_particlespawner_at_position(obj,pos,node)
+		end
+	end
+end
+
+local function remove_porticlespawners(pos,force)
+	--Remove particlespawners for all players out of range
+	-- force removes all particlespawners for the given position regardless of range
+	if porticlespawners[minetest.pos_to_string(pos)] then
+		for k,v in pairs(porticlespawners[minetest.pos_to_string(pos)]) do
+			local p=minetest.get_player_by_name(k)
+			local dst=PORTICLE_DISTANCE+1 --if player is logged off remove the particlespawner
+			if p and p:is_player() then
+				dst=vector.distance(p:get_pos(),pos)
+			end
+			if dst > PORTICLE_DISTANCE or force then
+				remove_particlespawner_at_position(k,pos)
+			end
+		end
+	end
+end
+
+local function check_porticlespawners(pos,node)
+	add_porticlespawners(pos,node)
+	remove_porticlespawners(pos)
+end
+
 -- Destroy portal if pos (portal frame or portal node) got destroyed
 local function destroy_nether_portal(pos)
 	local meta = minetest.get_meta(pos)
@@ -77,6 +139,7 @@ local function destroy_nether_portal(pos)
 		local node = minetest.get_node(pos)
 		if node and (node.name == "mcl_portals:portal" and (orientation == nil or (node.param2 == orientation))) then
 			minetest.log("action", "[mcl_portal] Destroying Nether portal at " .. minetest.pos_to_string(pos))
+			remove_porticlespawners(pos,true)
 			return minetest.remove_node(pos)
 		end
 	end
@@ -769,56 +832,16 @@ local function teleport(obj, portal_pos)
 	end
 end
 
+
 minetest.register_abm({
 	label = "Nether portal teleportation and particles",
 	nodenames = {"mcl_portals:portal"},
 	interval = 1,
 	chance = 1,
 	action = function(pos, node)
-		local o = node.param2		-- orientation
-		local d = math.random(0, 1)	-- direction
-		local time = math.random() * 1.9 + 0.5
-		local velocity, acceleration
-		if o == 1 then
-			velocity	= {x = math.random() * 0.7 + 0.3,	y = math.random() - 0.5,	z = math.random() - 0.5}
-			acceleration	= {x = math.random() * 1.1 + 0.3,	y = math.random() - 0.5,	z = math.random() - 0.5}
-		else
-			velocity	= {x = math.random() - 0.5,		y = math.random() - 0.5,	z = math.random() * 0.7 + 0.3}
-			acceleration	= {x = math.random() - 0.5,		y = math.random() - 0.5,	z = math.random() * 1.1 + 0.3}
-		end
-		local distance = vector.add(vector.multiply(velocity, time), vector.multiply(acceleration, time * time / 2))
-		if d == 1 then
-			if o == 1 then
-				distance.x	= -distance.x
-				velocity.x	= -velocity.x
-				acceleration.x	= -acceleration.x
-			else
-				distance.z	= -distance.z
-				velocity.z	= -velocity.z
-				acceleration.z	= -acceleration.z
-			end
-		end
-		distance = vector.subtract(pos, distance)
-		for _, obj in ipairs(minetest.get_objects_inside_radius(pos, 15)) do
-			if obj:is_player() then
-				minetest.add_particlespawner({
-					amount = node_particles_allowed_level + 1,
-					minpos = distance,
-					maxpos = distance,
-					minvel = velocity,
-					maxvel = velocity,
-					minacc = acceleration,
-					maxacc = acceleration,
-					minexptime = time,
-					maxexptime = time,
-					minsize = 0.3,
-					maxsize = 1.8,
-					collisiondetection = false,
-					texture = "mcl_particles_nether_portal.png",
-					playername = obj:get_player_name(),
-				})
-			end
-		end
+
+		check_porticlespawners(pos)
+
 		for _, obj in ipairs(minetest.get_objects_inside_radius(pos, 1)) do	--maikerumine added for objects to travel
 			local lua_entity = obj:get_luaentity()				--maikerumine added for objects to travel
 			if (obj:is_player() or lua_entity) and prevent_portal_chatter(obj) then