invisiblocks-cd2025/init.lua

-- Variables and Settings

local S = minetest.get_translator("invisiblocks")
local def = minetest.get_modpath("default") and true
local recipes = minetest.settings:get_bool("invisiblocks.hide_recipes") ~= true

-- Nodes

local helper = "invisiblocks_block.png^[multiply:#ff000070"

-- Invisible Barrier

minetest.register_node("invisiblocks:barrier", {
	description = S("Invisible Barrier Block"),
	drawtype = "airlike",
	buildable_to = false,
	inventory_image = helper,
	wield_image = helper,
	paramtype = "light",
	sunlight_propagates = true,
	sounds = def and default.node_sound_glass_defaults(),
	groups = {invisible = 1, unbreakable = 1},
	on_blast = function() end
})

helper = "invisiblocks_block.png^[multiply:#ffff0070"

-- Invisible Light

minetest.register_node("invisiblocks:light", {
	description = S("Invisible Light Source"),
	drawtype = "airlike",
	buildable_to = false,
	inventory_image = helper,
	wield_image = helper,
	paramtype = "light",
	sunlight_propagates = true,
	walkable = false,
	light_source = 14,
	sounds = def and default.node_sound_glass_defaults(),
	groups = {invisible = 1, unbreakable = 1},
	selection_box = {
		type = "fixed",
		fixed = {-0.5, -0.5, -0.5, 0.5, -5/16, 0.5}
	},
	on_blast = function() end
})

helper = "invisiblocks_block.png^[multiply:#00ff0070"

-- Invisible Mob Wall

minetest.register_node("invisiblocks:mob_wall", {
	description = S("Invisible Mob Wall"),
	drawtype = "airlike",
	buildable_to = false,
	inventory_image = helper,
	wield_image = helper,
	paramtype = "light",
	sunlight_propagates = true,
	walkable = false,
	sounds = def and default.node_sound_glass_defaults(),
	groups = {invisible = 1, unbreakable = 1},
	selection_box = {
		type = "fixed",
		fixed = {-0.5, -0.5, -0.5, 0.5, -5/16, 0.5}
	},
	on_blast = function() end
})

-- Recipes

if recipes and def then

	minetest.register_craft({
		output = "invisiblocks:barrier 8",
		recipe = {
			{"default:glass", "default:stone", "default:glass"},
			{"default:glass", "default:glass", "default:glass"},
			{"default:glass", "default:glass", "default:glass"},
		}
	})

	minetest.register_craft({
		output = "invisiblocks:light 8",
		recipe = {
			{"default:glass", "default:meselamp", "default:glass"},
			{"default:glass", "default:glass", "default:glass"},
			{"default:glass", "default:glass", "default:glass"},
		}
	})

	minetest.register_craft({
		output = "invisiblocks:mob_wall",
		recipe = {
			{"default:glass", "group:wood", "default:glass"},
			{"default:glass", "default:glass", "default:glass"},
			{"default:glass", "default:glass", "default:glass"},
		}
	})

	minetest.register_craft({
		output = "invisiblocks:show_stick",
		recipe = {
			{"invisiblocks:barrier"},
			{"group:stick"},
		}
	})
end

-- Tools

local function show_blocks(list, icon)

	if not list or #list == 0 then return end

	for n = 1, #list do

		minetest.add_particle({
			pos = list[n],
			velocity = {x = 0, y = 0, z = 0},
			acceleration = {x = 0, y = 0, z = 0},
			expirationtime = 5,
			size = 4,
			collisiondetection = false,
			vertical = false,
			texture = icon,
			glow = 5
		})
	end
end

-- USE tool to show invisible blocks in 10 node radius
-- PLACE or Right-Click to remove invisible blocks once placed

minetest.register_tool("invisiblocks:show_stick", {
	description = S("Show Stick (USE to Show, PLACE to Remove)"),
	inventory_image = "invisiblocks_stick.png",
	stack_max = 1,
	groups = {stick = 1},

	on_use = function(itemstack, user, pointed_thing)

		local pos = user:get_pos()

		local list = minetest.find_nodes_in_area(
				{x = pos.x - 10, y = pos.y - 10, z = pos.z - 10},
				{x = pos.x + 10, y = pos.y + 10, z = pos.z + 10},
				{"invisiblocks:barrier"})

		show_blocks(list, "invisiblocks_barrier.png")

		list = minetest.find_nodes_in_area(
				{x = pos.x - 10, y = pos.y - 10, z = pos.z - 10},
				{x = pos.x + 10, y = pos.y + 10, z = pos.z + 10},
				{"invisiblocks:light"})

		show_blocks(list, "invisiblocks_light.png")

		list = minetest.find_nodes_in_area(
				{x = pos.x - 10, y = pos.y - 10, z = pos.z - 10},
				{x = pos.x + 10, y = pos.y + 10, z = pos.z + 10},
				{"invisiblocks:mob_wall"})

		show_blocks(list, "invisiblocks_mob_wall.png")

		if not minetest.is_creative_enabled(user:get_player_name()) then
			itemstack:add_wear(65535 / 250) -- 250 uses
		end

		return itemstack
	end,

	on_place = function(itemstack, placer, pointed_thing)

		if pointed_thing.type ~= "node" then return end

		local pos = pointed_thing.under
		local player_name = placer:get_player_name()

		if minetest.is_protected(pos, player_name) then return end

		local node_name = minetest.get_node(pos).name

		if node_name == "invisiblocks:barrier"
		or node_name == "invisiblocks:light"
		or node_name == "invisiblocks:mob_wall" then

			local inv = placer:get_inventory()

			if inv:room_for_item("main", {name = node_name}) then
				inv:add_item("main", node_name)
			else
				minetest.add_item(pos, {name = node_name})
			end

			minetest.remove_node(pos)

			minetest.sound_play("default_break_glass",
					{pos = pos, gain = 1.0, max_hear_distance = 10}, true)
		end
	end
})