write something there

mods/minetest_game/butterflies/init.lua

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+-- butterflies/init.lua
+
+-- Load support for MT game translation.
+local S = minetest.get_translator("butterflies")
+
+-- Legacy compatibility, when pointabilities don't exist, pointable is set to true.
+local pointable_compat = not minetest.features.item_specific_pointabilities
+
+-- register butterflies
+local butter_list = {
+	{"white",  S("White Butterfly")},
+	{"red",    S("Red Butterfly")},
+	{"violet", S("Violet Butterfly")}
+}
+
+for i in ipairs (butter_list) do
+	local name = butter_list[i][1]
+	local desc = butter_list[i][2]
+
+	minetest.register_node("butterflies:butterfly_"..name, {
+		description = desc,
+		drawtype = "plantlike",
+		tiles = {{
+			name = "butterflies_butterfly_"..name.."_animated.png",
+			animation = {
+				type = "vertical_frames",
+				aspect_w = 16,
+				aspect_h = 16,
+				length = 3
+			},
+		}},
+		inventory_image = "butterflies_butterfly_"..name..".png",
+		wield_image =  "butterflies_butterfly_"..name..".png",
+		waving = 1,
+		paramtype = "light",
+		sunlight_propagates = true,
+		buildable_to = true,
+		walkable = false,
+		pointable = pointable_compat,
+		groups = {catchable = 1},
+		selection_box = {
+			type = "fixed",
+			fixed = {-0.1, -0.1, -0.1, 0.1, 0.1, 0.1},
+		},
+		floodable = true,
+		on_construct = function(pos)
+			minetest.get_node_timer(pos):start(1)
+		end,
+		on_timer = function(pos, elapsed)
+			if minetest.get_node_light(pos) < 11 then
+				minetest.set_node(pos, {name = "butterflies:hidden_butterfly_"..name})
+			end
+			minetest.get_node_timer(pos):start(30)
+		end
+	})
+
+	minetest.register_node("butterflies:hidden_butterfly_"..name, {
+		drawtype = "airlike",
+		inventory_image = "butterflies_butterfly_"..name..".png^default_invisible_node_overlay.png",
+		wield_image =  "butterflies_butterfly_"..name..".png^default_invisible_node_overlay.png",
+		paramtype = "light",
+		sunlight_propagates = true,
+		walkable = false,
+		pointable = false,
+		diggable = false,
+		drop = "",
+		groups = {not_in_creative_inventory = 1},
+		floodable = true,
+		on_construct = function(pos)
+			minetest.get_node_timer(pos):start(1)
+		end,
+		on_timer = function(pos, elapsed)
+			if minetest.get_node_light(pos) >= 11 then
+				minetest.set_node(pos, {name = "butterflies:butterfly_"..name})
+			end
+			minetest.get_node_timer(pos):start(30)
+		end
+	})
+end
+
+-- restart butterfly timers
+minetest.register_lbm({
+	name = "butterflies:butterfly_timer",
+	nodenames = {
+		"butterflies:butterfly_white",
+		"butterflies:butterfly_red",
+		"butterflies:butterfly_violet",
+		"butterflies:hidden_butterfly_white",
+		"butterflies:hidden_butterfly_red",
+		"butterflies:hidden_butterfly_violet",
+	},
+	run_at_every_load = true,
+
+	action = function(pos)
+		minetest.get_node_timer(pos):start(math.random(1,5))
+	end,
+})