make townaura more preformant

mods/ITEMS/mcl_core/nodes_base.lua

@@ -448,28 +448,40 @@ minetest.register_node("mcl_core:mycelium", {
 })
 mcl_core.register_snowed_node("mcl_core:mycelium_snow", "mcl_core:mycelium", nil, nil, false, S("Mycelium with Snow"))
 
+local PARTICLE_ABM_DISTANCE = 16
 
 --if minetest.settings:get("mcl_node_particles") == "full" then
 minetest.register_abm({
 	label = "Townaura particles",
 	nodenames = {"group:mycelium"},
-	interval = 0.1,
+	interval = 2,
 	chance = 30,
 	action = function(pos, node)
-		local apos = {x=pos.x, y=pos.y+0.51, z=pos.z}
-		local vel = { x = math.random(-3, 3)/10, y = math.random(0, 10)/60, z = math.random(-3, 3)/10 }
-		local acc = { x = 0, y = 0, z = 0 }
-		minetest.add_particle({
-			pos = apos,
-			velocity = vel,
-			acceleration = acc,
-			expirationtime = 4,
-			collisiondetection = true,
-			collision_removal = true,
-			size = 1,
-			texture = "mcl_core_mycelium_particle.png",
-			glow = LIGHT_LAVA,
-		})
+		local player_near = false
+		for _,player in pairs(minetest.get_connected_players()) do
+			if vector.distance(player:get_pos(), pos) < PARTICLE_ABM_DISTANCE then
+				player_near = true
+			end
+		end
+		if player_near then
+			local apos = {x=pos.x-2, y=pos.y+0.51, z=pos.z-2}
+			local apos2 = {x=pos.x+2, y=pos.y+0.51, z=pos.z+2}
+			local acc = { x = 0, y = 0, z = 0 }
+			minetest.add_particlespawner({
+				time = 2,
+				amount = 5,
+				minpos = apos,
+				maxpos = apos2,
+				minvel = vector.new(-3/10, 0, -3/10),
+				maxvel = vector.new(3/10, 10/60, 3/10),
+				minacc = acc,
+				expirationtime = 4,
+				collisiondetection = true,
+				collision_removal = true,
+				size = 1,
+				texture = "mcl_core_mycelium_particle.png",
+			})
+		end
 	end,
 })
 --end