musttest_game/mods/throwing/teleport_arrow.lua

minetest.register_craftitem("throwing:arrow_teleport", {
	description = "Teleport Arrow",
	inventory_image = "throwing_arrow_teleport.png",
})

minetest.register_node("throwing:arrow_teleport_box", {
	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {
			-- Shaft
			{-6.5/17, -1.5/17, -1.5/17, 6.5/17, 1.5/17, 1.5/17},
			--Spitze
			{-4.5/17, 2.5/17, 2.5/17, -3.5/17, -2.5/17, -2.5/17},
			{-8.5/17, 0.5/17, 0.5/17, -6.5/17, -0.5/17, -0.5/17},
			--Federn
			{6.5/17, 1.5/17, 1.5/17, 7.5/17, 2.5/17, 2.5/17},
			{7.5/17, -2.5/17, 2.5/17, 6.5/17, -1.5/17, 1.5/17},
			{7.5/17, 2.5/17, -2.5/17, 6.5/17, 1.5/17, -1.5/17},
			{6.5/17, -1.5/17, -1.5/17, 7.5/17, -2.5/17, -2.5/17},
			
			{7.5/17, 2.5/17, 2.5/17, 8.5/17, 3.5/17, 3.5/17},
			{8.5/17, -3.5/17, 3.5/17, 7.5/17, -2.5/17, 2.5/17},
			{8.5/17, 3.5/17, -3.5/17, 7.5/17, 2.5/17, -2.5/17},
			{7.5/17, -2.5/17, -2.5/17, 8.5/17, -3.5/17, -3.5/17},
		}
	},
	tiles = {"throwing_arrow_teleport.png", "throwing_arrow_teleport.png", "throwing_arrow_teleport_back.png", "throwing_arrow_teleport_front.png", "throwing_arrow_teleport_2.png", "throwing_arrow_teleport.png"},
	groups = {not_in_creative_inventory=1},
})

local THROWING_ARROW_ENTITY={
	_name = "throwing:arrow_teleport",
	physical = false,
	timer=0,
	visual = "wielditem",
	visual_size = {x=0.1, y=0.1},
	textures = {"throwing:arrow_teleport_box"},
	lastpos = {},
	collisionbox = {0,0,0,0,0,0},
	player = "",
	static_save = false,
}

local air_nodes = {"air", "group:airlike"}

local function do_teleport(self, tptarget, under, above)
	if not self.player_name then
		return
	end

	-- Player may have logged off after firing the arrow.
	local player = minetest.get_player_by_name(self.player_name)
	local tpos = minetest.find_node_near(tptarget, 1, air_nodes, true)

	if not player or not tpos then
		return
	end

	if not rc.is_valid_realm_pos(tpos) then
		return
	end

	-- Do not teleport attached players.
	local pname = player:get_player_name()
	if default.player_attached[pname] or player:get_attach() then
		return
	end

	local node = minetest.get_node(tpos)
	-- Maptools air is airlike but unbreakable. Don't TP in here.
	if minetest.get_item_group(node.name, "unbreakable") == 0 then
		if under and above then
			-- Arrow hit node.
			local node = minetest.get_node(under)
			local ndef = minetest.registered_nodes[node.name]
			if ndef then
				if not ndef.disallow_teleport then
					player:set_pos(tpos)
				end
			end
		else
			-- Hit player or object, 'tptarget' is intersection point.
			player:set_pos(tpos)
		end
	end
end

function THROWING_ARROW_ENTITY.hit_player(self, obj, intersection_point)
	do_teleport(self, intersection_point)
end

function THROWING_ARROW_ENTITY.hit_object(self, obj, intersection_point)
	do_teleport(self, intersection_point)
end

function THROWING_ARROW_ENTITY.hit_node(self, under, above, intersection_point)
	-- Intentionally duplicated 'above', not a bug.
	do_teleport(self, above, under, above)
end

THROWING_ARROW_ENTITY.on_step = function(self, dtime)
	throwing.do_fly(self, dtime)
end

minetest.register_entity("throwing:arrow_teleport_entity", THROWING_ARROW_ENTITY)

minetest.register_craft({
	output = 'throwing:arrow_teleport 3',
	recipe = {
		{'', 'group:stick', 'group:stick'},
		{'starpearl:pearl', 'group:stick', 'group:stick'},
		{'', 'group:stick', 'group:stick'},
	}
})