invisible/init.lua

local S = minetest.get_translator("invisible")

minetest.register_alias("i", "invisible:tool")

invisible = { time = 0, armor = minetest.get_modpath("3d_armor")}
minetest.register_privilege("invisible", {
	description = S("Allows the player to become invisible."),
	give_to_singleplayer = false,
})

invisible.toggle=function(user,sneak)
	local name=user:get_player_name()
	if minetest.check_player_privs(user:get_player_name(), {invisible=true}) then
		if not invisible[name] then
			user:set_nametag_attributes({color = {a = 0, r = 255, g = 255, b = 255}})
			invisible[name]={}
			invisible[name].tool=sneak
			invisible[name].visual_size=user:get_properties().visual_size
			invisible[name].textures=user:get_properties().textures
			user:set_properties({
				visual = "mesh",
				textures={"invisible_skin.png"},
				visual_size = {x=0, y=0},
				pointable=false,
			})
			minetest.chat_send_player(name, S("invisible on"))			
		else
			user:set_nametag_attributes({color = {a = 255, r = 255, g = 255, b = 255}})
			user:set_properties({
				visual = "mesh",
				textures=invisible[name].textures,
				visual_size = invisible[name].visual_size,
				pointable=true,
			})
			invisible[name]=nil

			if invisible.armor then
				armor:set_player_armor(user)
				armor:update_inventory(user)
			end

			minetest.chat_send_player(name, S("invisible off"))
		end
	else
	
		if not invisible[name] then
			invisible[name]={}
			user:set_nametag_attributes({color = {a = 0, r = 255, g = 255, b = 255}})
		else
			user:set_nametag_attributes({color = {a = 255, r = 255, g = 255, b = 255}})
			invisible[name]=nil
		end
	end
end

minetest.register_tool("invisible:tool", {
	description = S("invisible"),
	inventory_image = "default_stick.png",
	groups = {not_in_creative_inventory=1},
	on_use = function(itemstack, user, pointed_thing)
		if minetest.check_player_privs(user:get_player_name(), {invisible=true}) then
				invisible.toggle(user,true)
		else
			itemstack:replace(nil)
		end
		return itemstack
	end
})

minetest.register_globalstep(function(dtime)
	invisible.time=invisible.time+dtime
	if invisible.time<0.5 then return end
	invisible.time=0
	for _, player in pairs(minetest.get_connected_players()) do
		local name=player:get_player_name()
		local sneak=player:get_player_control().sneak
		if (sneak and not invisible[name]) or (sneak==false and invisible[name] and not invisible[name].tool) then
			invisible.toggle(player)
		end
	end
end)