Initial commit

39 files changed, 1411 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a57dbc9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+## Generic ignorable patterns and files
+*~
+.*.swp
+*bak*
+tags
+*.vim
+
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..511244e
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,18 @@
+Minetest Modpack - Railnet [minetest-railnet]
+=============================================
+
+**License Source Code:** LGPL v2.1
+
+**License of media** (textures, sounds and models): CC-0
+
+Authors of media files:
+-----------------------
+
+kddekadenz:
+  cart_bottom.png
+  cart_side.png
+  cart_top.png
+
+rarkenin:
+  cart_rail_*.png
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..94229ab
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+Modpack - Railnet [0.1.0]
+=========================
+
+**Minetest version:** 0.4.13
+
+This modpack is still very much a work-in-progress and is not recommended for
+existing worlds or public servers at this stage.
+
+[mod] Railtrack [railtrack]
+---------------------------
+
+**Depends:** default
+
+Proof of concept rail networking system which enables rail-carts to travel
+through unloaded map chunks.
+
+[mod] Railcart [railcart]
+-------------------------
+
+**Depends:** railtrack
+
+Proof of concept ground up re-write based on the original carts mod by PilzAdam.
+
diff --git a/modpack.txt b/modpack.txt
new file mode 100644
index 0000000..33d91f5
--- /dev/null
+++ b/modpack.txt
@@ -0,0 +1 @@
+The presence of this file indicates that the current folder is a modpack.
\ No newline at end of file
diff --git a/railcart/LICENSE.txt b/railcart/LICENSE.txt
new file mode 100644
index 0000000..5f3db02
--- /dev/null
+++ b/railcart/LICENSE.txt
@@ -0,0 +1,19 @@
+Minetest Mod - Railcart [railcart]
+==================================
+
+License Source Code: LGPL v2.1
+
+License of media (textures, sounds and models): CC-0
+
+Authors of media files:
+-----------------------
+
+kddekadenz:
+  cart_bottom.png
+  cart_side.png
+  cart_top.png
+
+Zeg9:
+  cart.x
+  cart.png
+
diff --git a/railcart/README.txt b/railcart/README.txt
new file mode 100644
index 0000000..dd4d70e
--- /dev/null
+++ b/railcart/README.txt
@@ -0,0 +1,30 @@
+Minetest Mod - Railcart [railcart]
+==================================
+
+Minetest version: 0.4.13
+
+Depends: railtrack
+
+Proof of concept ground up re-write of the carts mod. Currently uses media files
+borrowed from the original carts mod by PilzAdam.
+
+Please note, this mod makes heavy use of metadata so that carts are able to
+travel through unloaded map chunks, therefor a 'carts' privilege is required
+to place or pick up carts in multiplayer mode.
+
+Crafting
+--------
+
+S = Steel Ingot [default:steel_ingot]
+W = Wood [group:wood]
+
+Railcart: [railcart:cart]
+
++---+---+---+
+| S |   | S |
++---+---+---+
+| S |   | S |
++---+---+---+
+| W | S | W |
++---+---+---+
+
diff --git a/railcart/depends.txt b/railcart/depends.txt
new file mode 100644
index 0000000..e602f16
--- /dev/null
+++ b/railcart/depends.txt
@@ -0,0 +1 @@
+railtrack
diff --git a/railcart/init.lua b/railcart/init.lua
new file mode 100644
index 0000000..df9d4f1
--- /dev/null
+++ b/railcart/init.lua
@@ -0,0 +1,154 @@
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+
+dofile(modpath.."/railcart.lua")
+
+local worldpath = minetest.get_worldpath()
+local input = io.open(worldpath.."/railcart.txt", "r")
+if input then
+	local data = input:read('*all')
+	if data then
+		local carts = minetest.deserialize(data) or {}
+		for id, ref in pairs(carts) do
+			railcart.allcarts[id] = railcart.cart:new(ref)
+		end
+	end
+	input = nil
+end
+
+local function is_valid_player(object)
+	if object then
+		return object:is_player()
+	end
+end
+
+minetest.register_globalstep(function(dtime)
+	for _, cart in pairs(railcart.allcarts) do
+		cart:on_step(dtime)
+	end
+	railcart.timer = railcart.timer + dtime
+	if railcart.timer > RAILCART_OBJECT_SAVE_TIME then
+		railcart:save()
+		railcart.timer = 0
+	end
+end)
+
+minetest.register_privilege("carts", "Player can pick-up and place carts.")
+
+minetest.register_entity("railcart:cart_entity", {
+	physical = false,
+	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
+	visual = "mesh",
+	mesh = "railcart.x",
+	visual_size = {x=1, y=1},
+	textures = {"cart.png"},
+	cart = nil,
+	driver = nil,
+	timer = 0,
+	on_activate = function(self, staticdata, dtime_s)
+		self.object:set_armor_groups({immortal=1})
+		if staticdata == "expired" then
+			self.object:remove()
+		end
+	end,
+	on_punch = function(self, puncher, _, _, direction)
+		if not is_valid_player(puncher) then
+			return
+		end	
+		if puncher:get_player_control().sneak then
+			if self.cart then
+				if self.cart.id then
+					railcart.allcarts[self.cart.id] = nil
+				end
+			end
+			self.object:remove()
+			local inv = puncher:get_inventory()
+			if minetest.setting_getbool("creative_mode") then
+				if not inv:contains_item("main", "railcart:cart") then
+					inv:add_item("main", "railcart:cart")
+				end
+			else
+				inv:add_item("main", "railcart:cart")
+			end
+			return
+		end
+		if self.cart and direction then
+			local pos = vector.round(self.object:getpos())
+			local dir = vector.round(vector.normalize(direction))
+			self.timer = 0
+			self.cart.target = nil
+			self.cart.prev = pos
+			self.cart.vel = vector.multiply(dir, 4)
+			self.cart.accel = railtrack:get_acceleration(pos)
+			self.object:setvelocity(self.cart.vel)
+		end
+	end,
+	on_rightclick = function(self, clicker)
+		if not is_valid_player(clicker) then
+			return
+		end
+		if self.driver and clicker == self.driver then
+			self.driver = nil
+			clicker:set_detach()
+		elseif not self.driver then
+			self.driver = clicker
+			clicker:set_attach(self.object, "", {x=0,y=5,z=0}, {x=0,y=0,z=0})
+		end
+	end,
+	on_step = function(self, dtime)
+		local cart = self.cart
+		local object = self.object
+		if not cart or not object then
+			return
+		end
+		self.timer = self.timer - dtime
+		if self.timer > 0 then
+			return
+		end
+		self.timer = railcart:update(cart, RAILCART_ENTITY_UPDATE_TIME, object)
+	end,
+	get_staticdata = function(self)
+		return "expired"
+	end,
+})
+
+minetest.register_craftitem("railcart:cart", {
+	description = "Railcart",
+	inventory_image = minetest.inventorycube("cart_top.png", "cart_side.png", "cart_side.png"),
+	wield_image = "cart_side.png",
+	on_place = function(itemstack, placer, pointed_thing)
+		local name = placer:get_player_name()
+		if not name or pointed_thing.type ~= "node" then
+			return
+		end
+		local pos = pointed_thing.under
+		if not railtrack:is_railnode(pos) then
+			return
+		end
+		if not minetest.is_singleplayer() then
+			if not minetest.check_player_privs(name, {carts=true}) then
+				minetest.chat_send_player(name, "Requires carts privilege")
+				return
+			end
+		end
+		local cart = railcart.cart:new()
+		cart.id = #railcart.allcarts + 1
+		cart.pos = pos
+		cart.prev = vector.new(pos)
+		cart.accel = railtrack:get_acceleration(pos)
+		table.insert(railcart.allcarts, cart)
+		if not minetest.setting_getbool("creative_mode") then
+			itemstack:take_item()
+		end
+		return itemstack
+	end,
+})
+
+minetest.register_craft({
+	output = "railcart:cart",
+	recipe = {
+		{"default:steel_ingot", "", "default:steel_ingot"},
+		{"default:steel_ingot", "", "default:steel_ingot"},
+		{"group:wood", "default:steel_ingot", "group:wood"},
+	},
+})
+
diff --git a/railcart/models/cart.png b/railcart/models/cart.png
new file mode 100644
index 0000000..1f9f568
--- /dev/null
+++ b/railcart/models/cart.png
diff --git a/railcart/models/railcart.x b/railcart/models/railcart.x
new file mode 100644
index 0000000..3325aaf
--- /dev/null
+++ b/railcart/models/railcart.x
@@ -0,0 +1,339 @@
+xof 0303txt 0032
+
+Frame Root {
+  FrameTransformMatrix {
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+} //End of Root Frame
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+      1;3;     0.000000, 3.000000, 3.000000;;,
+      2;3;     0.000000,-3.000000, 3.000000;;,
+      3;3;     0.000000,-3.000000, 3.000000;;;
+    }
+    AnimationKey { //Rotation
+      0;
+      4;
+      0;4;    -1.000000, 0.000000, 0.000000, 0.000000;;,
+      1;4;    -0.923880,-0.382683,-0.000000, 0.000000;;,
+      2;4;    -0.923880, 0.382683, 0.000000, 0.000000;;,
+      3;4;    -0.923880, 0.382683, 0.000000, 0.000000;;;
+    }
+    AnimationKey { //Scale
+      1;
+      4;
+      0;3;     5.000000, 5.000000, 5.000000;;,
+      1;3;     5.000000, 5.000000, 5.000000;;,
+      2;3;     5.000000, 5.000000, 5.000000;;,
+      3;3;     5.000000, 5.000000, 5.000000;;;
+    }
+  }
+} //End of AnimationSet
diff --git a/railcart/railcart.lua b/railcart/railcart.lua
new file mode 100644
index 0000000..917da44
--- /dev/null
+++ b/railcart/railcart.lua
@@ -0,0 +1,252 @@
+RAILCART_ENTITY_UPDATE_TIME = 1
+RAILCART_OBJECT_UPDATE_TIME = 5
+RAILCART_OBJECT_SAVE_TIME = 10
+RAILCART_RELOAD_DISTANCE = 32
+RAILCART_SNAP_DISTANCE = 0.5
+RAILCART_SPEED_MIN = 0.1
+RAILCART_SPEED_MAX = 10
+
+railcart = {
+	timer = 0,
+	allcarts = {},
+}
+
+railcart.cart = {
+	id = nil,
+	entity = {},
+	pos = nil,
+	target = nil,
+	prev = nil,
+	accel = nil,
+	dir = {x=0, y=0, z=0},
+	vel = {x=0, y=0, z=0},
+	acc = {x=0, y=0, z=0},
+	timer = 0,
+}
+
+function railcart.cart:new(obj)
+	obj = obj or {}
+	setmetatable(obj, self)
+	self.__index = self
+	return obj
+end
+
+function railcart.cart:is_loaded()
+	for _, player in pairs(minetest.get_connected_players()) do
+		local pos = player:getpos()
+		if pos then
+			local dist = railtrack:get_distance(pos, self.pos)
+			if dist <= RAILCART_RELOAD_DISTANCE then
+				return true
+			end
+		end
+	end
+	return false
+end
+
+function railcart.cart:on_step(dtime)
+	self.timer = self.timer - dtime
+	if self.timer > 0 then
+		return
+	end
+	self.timer = RAILCART_OBJECT_UPDATE_TIME
+	local entity = railcart:get_cart_ref(self.id)
+	if entity.object then
+		return
+	end
+	if self:is_loaded() then
+		local object = minetest.add_entity(self.pos, "railcart:cart_entity")
+		if object then
+			entity = object:get_luaentity() or {}
+			entity.cart = self
+			object:setvelocity(self.vel)
+			object:setacceleration(self.acc)
+		end
+	else
+		self.timer = railcart:update(self, self.timer)
+	end
+end
+
+function railcart:save()
+	local carts = {}
+	for id, cart in pairs(railcart.allcarts) do
+		local ref = {}
+		for k, v in pairs(cart) do
+			ref[k] = v
+		end
+		ref.entity = nil
+		table.insert(carts, ref)
+	end
+	local output = io.open(minetest.get_worldpath().."/railcart.txt",'w')
+	if output then
+		output:write(minetest.serialize(carts))
+		io.close(output)
+	end
+end
+
+function railcart:get_cart_ref(id)
+	local cart_ref = {}
+	for _, ref in pairs(minetest.luaentities) do
+		if ref.cart then
+			if ref.cart.id == id then
+				cart_ref = ref
+				break
+			end
+		end
+	end
+	return cart_ref
+end
+
+function railcart:get_delta_time(vel, acc, dist)
+	if vel > 0 then
+		if acc == 0 then
+			return dist / vel
+		end
+		local r = math.sqrt(vel * vel + 2 * acc * dist)
+		if r > 0 then
+			return (-vel + r) / acc
+		end
+	end
+	return 9999 --INF
+end
+
+function railcart:velocity_to_dir(v)
+	if math.abs(v.x) > math.abs(v.z) then
+		return {x=railtrack:get_sign(v.x), y=railtrack:get_sign(v.y), z=0}
+	else
+		return {x=0, y=railtrack:get_sign(v.y), z=railtrack:get_sign(v.z)}
+	end
+end
+
+function railcart:velocity_to_speed(vel)
+	local speed = math.max(math.abs(vel.x), math.abs(vel.z))
+	if speed < RAILCART_SPEED_MIN then
+		speed = 0
+	elseif speed > RAILCART_SPEED_MAX then
+		speed = RAILCART_SPEED_MAX
+	end
+	return speed
+end
+
+function railcart:get_target(pos, vel)
+	local meta = minetest.get_meta(vector.round(pos))
+	local dir = self:velocity_to_dir(vel)
+	local targets = {}
+	local rots = RAILTRACK_ROTATIONS
+	local contype = meta:get_string("contype") or ""
+	local s_junc = meta:get_string("junctions") or ""
+	local s_cons = meta:get_string("connections") or ""
+	local s_rots = meta:get_string("rotations") or ""
+	if contype == "section" then
+		local junctions = minetest.deserialize(s_junc) or {}
+		for _, p in pairs(junctions) do
+			table.insert(targets, p)
+		end
+	else
+		local cons = minetest.deserialize(s_cons) or {}
+		for _, p in pairs(cons) do
+			table.insert(targets, p)
+		end
+		if s_rots ~= "" then
+			local fwd = false
+			for _, p in pairs(cons) do
+				if vector.equals(vector.add(pos, dir), p) then
+					fwd = true
+				end
+			end
+			if fwd == true or #cons == 1 then
+				rots = s_rots
+			end
+		end
+	end
+	local rotations = railtrack:get_rotations(rots, dir)
+	for _, r in ipairs(rotations) do
+		for _, t in pairs(targets) do
+			local d = railtrack:get_direction(t, pos)
+			if r.x == d.x and r.z == d.z then
+				return t
+			end
+		end
+	end
+end
+
+function railcart:update(cart, time, object)
+	if object then
+		cart.pos = object:getpos()
+		cart.vel = object:getvelocity()
+	end
+	if not cart.target then
+		cart.pos = vector.new(cart.prev)
+		cart.target = railcart:get_target(cart.pos, cart.vel)
+		if object then
+			object:moveto(cart.pos)
+		end
+	end
+	local speed = railcart:velocity_to_speed(cart.vel)
+	if not cart.target then
+		speed = 0
+	end
+	if speed > RAILCART_SPEED_MIN then
+		cart.dir = railtrack:get_direction(cart.target, cart.pos)
+		local d1 = railtrack:get_distance(cart.prev, cart.target)
+		local d2 = railtrack:get_distance(cart.prev, cart.pos)
+		local dist = d1 - d2
+		if dist > RAILCART_SNAP_DISTANCE then
+			local accel = RAILTRACK_ACCEL_FLAT
+			if cart.dir.y == -1 then
+				accel = RAILTRACK_ACCEL_DOWN
+			elseif cart.dir.y == 1 then
+				accel = RAILTRACK_ACCEL_UP
+			end
+			accel = cart.accel or accel
+			local dt = railcart:get_delta_time(speed, accel, dist)
+			if dt < time then
+				time = dt
+			end
+			local dp = speed * time + 0.5 * accel * time * time
+			local vf = speed + accel * time
+			if object then
+				if vf <= 0 then
+					speed = 0
+					accel = 0
+				end
+				cart.vel = vector.multiply(cart.dir, speed)
+				cart.acc = vector.multiply(cart.dir, accel)
+			elseif dp > 0 then
+				cart.vel = vector.multiply(cart.dir, vf)
+				cart.pos = vector.add(cart.pos, vector.multiply(cart.dir, dp))
+			end
+		else
+			cart.pos = vector.new(cart.target)
+			cart.prev = vector.new(cart.target)
+			cart.accel = railtrack:get_acceleration(cart.target)
+			cart.target = nil
+			return 0
+		end
+	else
+		cart.vel = {x=0, y=0, z=0}
+		cart.acc = {x=0, y=0, z=0}
+	end
+	if object then
+		if cart.dir.y == -1 then
+			object:set_animation({x=1, y=1}, 1, 0)
+		elseif cart.dir.y == 1 then
+			object:set_animation({x=2, y=2}, 1, 0)
+		else
+			object:set_animation({x=0, y=0}, 1, 0)
+		end
+		if cart.dir.x < 0 then
+			object:setyaw(math.pi / 2)
+		elseif cart.dir.x > 0 then
+			object:setyaw(3 * math.pi / 2)
+		elseif cart.dir.z < 0 then
+			object:setyaw(math.pi)
+		elseif cart.dir.z > 0 then
+			object:setyaw(0)
+		end
+		object:setvelocity(cart.vel)
+		object:setacceleration(cart.acc)
+	end
+	return time
+end
+
diff --git a/railcart/textures/cart.png b/railcart/textures/cart.png
new file mode 100644
index 0000000..1f9f568
--- /dev/null
+++ b/railcart/textures/cart.png
diff --git a/railcart/textures/cart_bottom.png b/railcart/textures/cart_bottom.png
new file mode 100644
index 0000000..f84b1ae
--- /dev/null
+++ b/railcart/textures/cart_bottom.png
diff --git a/railcart/textures/cart_side.png b/railcart/textures/cart_side.png
new file mode 100644
index 0000000..79f6c32
--- /dev/null
+++ b/railcart/textures/cart_side.png
diff --git a/railcart/textures/cart_top.png b/railcart/textures/cart_top.png
new file mode 100644
index 0000000..8140fc7
--- /dev/null
+++ b/railcart/textures/cart_top.png
diff --git a/railtrack/LICENSE.txt b/railtrack/LICENSE.txt
new file mode 100644
index 0000000..c43348a
--- /dev/null
+++ b/railtrack/LICENSE.txt
@@ -0,0 +1,13 @@
+Minetest Mod - Railtrack [railtrack]
+====================================
+
+License Source Code: LGPL v2.1
+
+License of media (textures, sounds and models): CC-0
+
+Authors of media files:
+-----------------------
+
+rarkenin:
+  cart_rail_*.png
+
diff --git a/railtrack/README.txt b/railtrack/README.txt
new file mode 100644
index 0000000..b371e29
--- /dev/null
+++ b/railtrack/README.txt
@@ -0,0 +1,72 @@
+Minetest Mod - Railtrack [railtrack]
+====================================
+
+Minetest version: 0.4.13
+
+Depends: default
+
+Proof of concept rail networking system which enables rail-carts to travel
+through unloaded map chunks.
+
+Please note, this mod makes heavy use of metadata so that much of the processing
+gets done as tracks are laid, for this reason a 'rails' privilege is required in
+order to place rails when using multiplayer mode.
+
+Crafting
+--------
+
+R = Rail [default:rail]
+F = Mese Crystal Fragment [default:mese_crystal_fragment]
+C = Coal Lump [default:coal_lump]
+D = Diamond [default:diamond]
+M = Mese Block [default:mese]
+
+Powered Rail: [railtrack:powerrail]
+
+By default these rails apply a positive acceleration during the time a cart
+remains on a given section of track. When used with the mesecons mod the rails
+will require power from a mesecon source to become active.
+
++---+---+---+
+| R | F | R |
++---+---+---+
+
+Braking Rail: [railtrack:brakerail]
+
+By default these rails apply a negative acceleration during the time a cart
+remains on a given section of track. When used with the mesecons mod the rails
+will require power from a mesecon source to become active.
+
++---+---+---+
+| R | C | R |
++---+---+---+
+
+Superconducting Rail: [railtrack:superrail]
+
+Zero friction rails that are easier to manage and are also a little less
+cpu-intensive by avoiding the use of square root calculations.
+
++---+---+---+
+| R | D | R |
++---+---+---+
+
+Switching Rail: [railtrack:switchrail]
+
+Currently depends on mesecons to do much other than provide a convenient, zero
+friction union to join long sections of superconducting rails.
+
++---+---+---+
+| R | M | R |
++---+---+---+
+
+Misc Items
+----------
+
+Rail Fixer: [railtrack:fixer]
+
+Only available in creative menu or with give(me) privileges.
+
+Rail Inspector [railtrack:inspector]
+
+Only available in creative menu or with give(me) privileges.
+
diff --git a/railtrack/depends.txt b/railtrack/depends.txt
new file mode 100644
index 0000000..4ad96d5
--- /dev/null
+++ b/railtrack/depends.txt
@@ -0,0 +1 @@
+default
diff --git a/railtrack/init.lua b/railtrack/init.lua
new file mode 100644
index 0000000..373fcaa
--- /dev/null
+++ b/railtrack/init.lua
@@ -0,0 +1,197 @@
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+
+dofile(modpath.."/railtrack.lua")
+
+railtrack:register_rail(":default:rail", {
+	description = "Rail",
+	tiles = {"default_rail.png", "default_rail_curved.png",
+		"default_rail_t_junction.png", "default_rail_crossing.png"},
+	railtype = "rail",
+})
+
+railtrack:register_rail("railtrack:superrail", {
+	description = "Superconducting Rail",
+	tiles = {"carts_rail_sup.png", "carts_rail_curved_sup.png",
+		"carts_rail_t_junction_sup.png", "carts_rail_crossing_sup.png"},
+	railtype = "superrail",
+	acceleration = 0,
+})
+
+railtrack:register_rail("railtrack:powerrail", {
+	description = "Powered Rail",
+	tiles = {"carts_rail_pwr.png", "carts_rail_curved_pwr.png",
+		"carts_rail_t_junction_pwr.png", "carts_rail_crossing_pwr.png"},
+	railtype = "powerrail",
+	acceleration = 4,
+	mesecons = {
+		effector = {
+			action_on = function(pos, node)
+				railtrack:set_acceleration(pos, 4)
+			end,
+			action_off = function(pos, node)
+				railtrack:set_acceleration(pos, RAILTRACK_FRICTION_FLAT)
+			end,
+		},
+	},
+})
+
+railtrack:register_rail("railtrack:brakerail", {
+	description = "Braking Rail",
+	tiles = {"carts_rail_brk.png", "carts_rail_curved_brk.png",
+		"carts_rail_t_junction_brk.png", "carts_rail_crossing_brk.png"},
+	railtype = "brakerail",
+	acceleration = -4,
+	mesecons = {
+		effector = {
+			action_on = function(pos, node)
+				railtrack:set_acceleration(pos, -4)
+			end,
+			action_off = function(pos, node)
+				railtrack:set_acceleration(pos, RAILTRACK_FRICTION_FLAT)
+			end,
+		},
+	},
+})
+
+railtrack:register_rail("railtrack:switchrail", {
+	description = "Switching Rail",
+	tiles = {"carts_rail_swt.png", "carts_rail_curved_swt.png",
+		"carts_rail_t_junction_swt.png", "carts_rail_crossing_swt.png"},
+	railtype = "switchrail",
+	acceleration = 0,
+	mesecons = {
+		effector = {
+			action_on = function(pos, node)
+				local meta = minetest.get_meta(pos)
+				meta:set_string("rotations", "RFLB")
+			end,
+			action_off = function(pos, node)
+				local meta = minetest.get_meta(pos)
+				meta:set_string("rotations", nil)
+			end,
+		},
+	},
+})
+
+minetest.register_privilege("rails", "Player can dig and place rails.")
+
+minetest.register_tool("railtrack:fixer", {
+	description = "Rail Fixer",
+	inventory_image = "railtrack_fixer.png",
+	wield_image = "railtrack_fixer.png",
+	on_use = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing, false)
+		local name = user:get_player_name()
+		if not pos or not name or pointed_thing.type ~= "node" then
+			return
+		end
+		if not railtrack:is_railnode(pos) then
+			minetest.chat_send_player(name, "Not a rail node!")
+			return
+		end
+		if not minetest.is_singleplayer() then
+			if not minetest.check_player_privs(name, {rails=true}) then
+				minetest.chat_send_player(name, "Requires rails privilege")
+				return
+			end
+		end
+		local node = minetest.get_node(pos)
+		minetest.remove_node(pos)
+		set_node(pos, node)
+		local def = minetest.registered_items[node.name] or {}
+		if type(def.after_place_node) == "function" then
+			def.after_place_node(pos, user, node)
+		end
+	end,
+})
+
+minetest.register_tool("railtrack:inspector", {
+	description = "Rail Inspector",
+	inventory_image = "railtrack_inspector.png",
+	wield_image = "railtrack_inspector.png",
+	on_use = function(itemstack, user, pointed_thing)
+		local name = user:get_player_name()
+		local pos = minetest.get_pointed_thing_position(pointed_thing, false)
+		if not name or not pos then
+			return
+		end
+		local node = minetest.get_node(pos) or {}
+		if not railtrack:is_railnode(pos) or not node.name then
+			minetest.chat_send_player(name, "Not a rail node!")
+			return
+		end
+		local ref = minetest.registered_items[node.name] or {}
+		local meta = minetest.get_meta(pos)
+		local form = ""
+		local size = 2.5
+		form = form.."label[0.5,0.5;POS: "..minetest.pos_to_string(pos).."]"
+		local railtype = ref.railtype or "NIL"
+		form = form.."label[0.5,1.0;RAILTYPE: "..railtype.."]"
+		local contype = meta:get_string("contype") or "NIL"
+		form = form.."label[0.5,1.5;CONTYPE: "..contype.."]"
+		local accel = meta:get_string("acceleration") or "NIL"
+		form = form.."label[0.5,2.0;ACCEL: "..accel.."]"
+		local s_junc = meta:get_string("junctions")
+		if s_junc then
+			local junctions = minetest.deserialize(s_junc)
+			if junctions then
+				form = form.."label[0.5,2.5;JUNCTIONS:]"
+				for i, p in ipairs(junctions) do
+					size = size + 0.5
+					form = form.."label[0.5,"..size..";#"..i.." "
+							..minetest.pos_to_string(p).."]"
+				end
+			end
+		end
+		local s_cons = meta:get_string("connections")
+		if s_cons then
+			local cons = minetest.deserialize(s_cons)
+			if cons then
+				size = size + 0.5
+				form = form.."label[0.5,"..size..";CONNECTIONS:]"
+				for i, p in pairs(cons) do
+					size = size + 0.5
+					form = form.."label[0.5,"..size..";#"..i.." "
+							..minetest.pos_to_string(p).."]"
+				end
+			end
+		end
+		local s_rots = meta:get_string("rotations")
+		if s_rots then
+			size = size + 0.5
+			form = form.."label[0.5,"..size..";ROTATIONS: "..s_rots.."]"
+		end
+		form = form.."button_exit[3.0,"..(size + 1)..";2,0.5;;Ok]"
+		form = "size[8,"..(size + 2).."]"..form
+		minetest.show_formspec(name, "info", form)
+	end,
+})
+
+minetest.register_craft({
+	output = "railtrack:powerrail 2",
+	recipe = {
+		{"default:rail", "default:mese_crystal_fragment", "default:rail"},
+	}
+})
+
+minetest.register_craft({
+	output = "railtrack:brakerail 2",
+	recipe = {
+		{"default:rail", "default:coal_lump", "default:rail"},
+	}
+})
+
+minetest.register_craft({
+	output = "railtrack:switchrail 2",
+	recipe = {
+		{"default:rail", "default:mese", "default:rail"},
+	}
+})
+
+minetest.register_craft({
+	output = "railtrack:superrail 2",
+	recipe = {
+		{"default:rail", "default:diamond", "default:rail"},
+	}
+})
+
diff --git a/railtrack/railtrack.lua b/railtrack/railtrack.lua
new file mode 100644
index 0000000..3a1f714
--- /dev/null
+++ b/railtrack/railtrack.lua
@@ -0,0 +1,284 @@
+RAILTRACK_WARN_SECTION_LEN = 20
+RAILTRACK_ROTATIONS = "FLR"
+RAILTRACK_ACCEL_FLAT = -0.5
+RAILTRACK_ACCEL_UP = -2
+RAILTRACK_ACCEL_DOWN = 2
+
+railtrack = {}
+
+railtrack.default_rail = {
+	description = "Rail",
+	drawtype = "raillike",
+	tiles = {"default_rail.png", "default_rail_curved.png",
+		"default_rail_t_junction.png", "default_rail_crossing.png"},
+	paramtype = "light",
+	sunlight_propagates = true,
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
+	},
+	groups = {bendy = 2, dig_immediate = 2, attached_node = 1,
+		connect_to_raillike = minetest.raillike_group("rail")},
+	railtype = "rail",
+	on_place = function(itemstack, placer, pointed_thing)
+		local name = placer:get_player_name()
+		if not name or pointed_thing.type ~= "node" then
+			return
+		end
+		if not minetest.is_singleplayer() then
+			if not minetest.check_player_privs(name, {rails=true}) then
+				minetest.chat_send_player(name, "Requires rails privilege")
+				return
+			end
+		end
+	end,
+	after_place_node = function(pos, placer, itemstack)
+		local meta = minetest.get_meta(pos)
+		local def = itemstack:get_definition() or {}
+		if def.acceleration then
+			meta:set_string("acceleration", def.acceleration)
+		end
+		local junc = {}
+		local contype = meta:get_string("contype") or ""
+		local s_cons = meta:get_string("connections") or ""
+		if contype == "section" then
+			railtrack:warn_section_len(placer, pos, meta)
+		elseif s_cons ~= "" then
+			local cons = minetest.deserialize(s_cons)
+			for _, con in pairs(cons) do
+				if railtrack:warn_section_len(placer, con) then
+					break
+				end
+			end
+		end
+	end,
+	on_construct = function(pos)
+		railtrack:update_rails(pos)
+	end,
+	after_destruct = function(pos)
+		local cons = railtrack:get_connections(pos)
+		for _, p in pairs(cons) do
+			railtrack:update_rails(p)
+		end
+	end,
+}
+
+function railtrack:register_rail(name, def)
+	for k, v in pairs(railtrack.default_rail) do
+		if not def[k] then
+			def[k] = v
+		end
+	end
+	def.inventory_image = def.inventory_image or def.tiles[1]
+	def.wield_image = def.wield_image or def.tiles[1]
+	minetest.register_node(name, def)
+end
+
+function railtrack:warn_section_len(player, pos, meta)
+	meta = meta or minetest.get_meta(pos)
+	local contype = meta:get_string("contype") or ""
+	if contype == "section" then
+		local s_junc = meta:get_string("junctions") or ""
+		if s_junc ~= "" then
+			local junc = minetest.deserialize(s_junc)
+			if #junc == 2 then
+				local dist = railtrack:get_distance(junc[1], junc[2])
+				if dist > RAILTRACK_WARN_SECTION_LEN then
+					local name = player:get_player_name()
+					if name then
+						minetest.chat_send_player(name, "Warning, section"
+								.." length "..dist.." exceeds the recommended"
+								.." maximum of "..RAILTRACK_WARN_SECTION_LEN)
+						return true
+					end
+				end
+			end
+		end
+	end
+end
+
+function railtrack:is_railnode(pos)
+	local node = minetest.get_node(pos)
+	if node then
+		return minetest.get_item_group(node.name, "connect_to_raillike") > 0
+	end
+end
+
+function railtrack:get_sign(z)
+	if z == 0 then
+		return 0
+	else
+		return z / math.abs(z)
+	end
+end
+
+function railtrack:get_rotations(s_rots, dir)
+	local rots = {}
+	for i = 1, string.len(s_rots) do
+		local r = string.sub(s_rots, i, i)
+		local rot = nil
+		if r == "F" then
+			rot = {x=dir.x, z=dir.z}
+		elseif r == "L" then
+			rot = {x=-dir.z, z=dir.x}
+		elseif r == "R" then
+			rot = {x=dir.z, z=-dir.x}
+		elseif r == "B" then
+			rot = {x=-dir.x, z=-dir.z}
+		end
+		if rot then
+			table.insert(rots, rot)
+		end
+	end
+	return rots
+end
+
+function railtrack:get_acceleration(pos)
+	local meta = minetest.get_meta(pos)
+	local accel = meta:get_string("acceleration") or ""
+	if accel ~= "" then
+		return tonumber(accel)
+	end
+end
+
+function railtrack:get_direction(p1, p2)
+	local v = vector.subtract(p1, p2)
+	return {
+		x = railtrack:get_sign(v.x),
+		y = railtrack:get_sign(v.y),
+		z = railtrack:get_sign(v.z),
+	}
+end
+
+function railtrack:get_distance(p1, p2)
+	local dx = p1.x - p2.x
+	local dz = p1.z - p2.z
+	return math.abs(dx) + math.abs(dz)
+end
+
+
+function railtrack:get_railtype(pos)
+	local node = minetest.get_node(pos) or {}
+	if node.name then
+		local ref = minetest.registered_items[node.name] or {}
+		return ref.railtype
+	end
+end
+
+function railtrack:get_connection_type(pos, cons)
+	local railtype = railtrack:get_railtype(pos)
+	if #cons == 0 then
+		return "single"
+	elseif #cons == 1 then
+		return "junction"
+	elseif #cons == 2 then
+		if cons[1].x == cons[2].x or cons[1].z == cons[2].z then
+			if (cons[1].y == cons[2].y and cons[1].y == pos.y) or
+					(math.abs(cons[1].y - cons[2].y) == 2) then
+				if railtype == railtrack:get_railtype(cons[1]) and
+						railtype == railtrack:get_railtype(cons[2]) then
+					return "section"
+				end
+			end
+		end
+	end
+	return "junction"
+end
+
+function railtrack:get_connections(pos)
+	local connections = {}
+	for y = -1, 1 do
+		for x = -1, 1 do
+			for z = -1, 1 do
+				if math.abs(x) ~= math.abs(z) then
+					local p = vector.add(pos, {x=x, y=y, z=z})
+					if railtrack:is_railnode(p) then
+						table.insert(connections, p)
+					end
+				end
+			end
+		end
+	end
+	return connections
+end
+
+function railtrack:get_junctions(pos, last_pos, junctions)
+	junctions = junctions or {}
+	local cons = railtrack:get_connections(pos)
+	local contype = railtrack:get_connection_type(pos, cons)
+	if contype == "junction" then
+		table.insert(junctions, pos)
+	elseif contype == "section" then
+		if last_pos then
+			for i, p in pairs(cons) do
+				if vector.equals(p, last_pos) then
+					cons[i] = nil
+				end
+			end
+		end
+		for _, p in pairs(cons) do
+			railtrack:get_junctions(p, pos, junctions)
+		end
+	end
+	return junctions
+end
+
+function railtrack:set_acceleration(pos, accel)
+	local meta = minetest.get_meta(pos)
+	local contype = meta:get_string("contype")
+	if contype == "section" then
+		local s_junc = meta:get_string("junctions") or ""
+		local junc = minetest.deserialize(s_junc) or {}
+		if #junc == 2 then
+			local p = vector.new(junc[2])
+			local dir = railtrack:get_direction(junc[1], junc[2])
+			local dist = railtrack:get_distance(junc[1], junc[2])
+			for i = 0, dist do
+				local m = minetest.get_meta(p)
+				if m then
+					m:set_string("acceleration", tostring(accel))
+				end
+				p = vector.add(dir, p)
+			end
+		end
+	else
+		meta:set_string("acceleration", tostring(accel))
+	end
+end
+
+function railtrack:update_rails(pos, last_pos, level)
+	local connections = {}
+	local junctions = {}
+	local meta = minetest.get_meta(pos)
+	local cons = railtrack:get_connections(pos)
+	local contype = railtrack:get_connection_type(pos, cons)
+	level = level or 0
+	for i, p in pairs(cons) do
+		connections[i] = p
+	end
+	if contype == "junction" then
+		level = level + 1
+	end
+	if contype == "section" or level < 2 then
+		if last_pos then
+			for i, p in pairs(cons) do
+				if vector.equals(p, last_pos) then
+					cons[i] = nil
+				end
+			end
+		end
+		for _, p in pairs(cons) do
+			railtrack:update_rails(p, pos, level)
+		end
+	end
+	if contype == "section" then
+		junctions = railtrack:get_junctions(pos)
+		connections = {}
+	end
+	meta:set_string("connections", minetest.serialize(connections))
+	meta:set_string("junctions", minetest.serialize(junctions))
+	meta:set_string("contype", contype)
+end
+
diff --git a/railtrack/textures/carts_rail_brk.png b/railtrack/textures/carts_rail_brk.png
new file mode 100644
index 0000000..f3e0ff9
--- /dev/null
+++ b/railtrack/textures/carts_rail_brk.png
diff --git a/railtrack/textures/carts_rail_crossing_brk.png b/railtrack/textures/carts_rail_crossing_brk.png
new file mode 100644
index 0000000..3ace508
--- /dev/null
+++ b/railtrack/textures/carts_rail_crossing_brk.png
diff --git a/railtrack/textures/carts_rail_crossing_pwr.png b/railtrack/textures/carts_rail_crossing_pwr.png
new file mode 100644
index 0000000..d63f133
--- /dev/null
+++ b/railtrack/textures/carts_rail_crossing_pwr.png
diff --git a/railtrack/textures/carts_rail_crossing_sup.png b/railtrack/textures/carts_rail_crossing_sup.png
new file mode 100644
index 0000000..b51467d
--- /dev/null
+++ b/railtrack/textures/carts_rail_crossing_sup.png
diff --git a/railtrack/textures/carts_rail_crossing_swt.png b/railtrack/textures/carts_rail_crossing_swt.png
new file mode 100644
index 0000000..a780cf2
--- /dev/null
+++ b/railtrack/textures/carts_rail_crossing_swt.png
diff --git a/railtrack/textures/carts_rail_curved_brk.png b/railtrack/textures/carts_rail_curved_brk.png
new file mode 100644
index 0000000..5a84918
--- /dev/null
+++ b/railtrack/textures/carts_rail_curved_brk.png
diff --git a/railtrack/textures/carts_rail_curved_pwr.png b/railtrack/textures/carts_rail_curved_pwr.png
new file mode 100644
index 0000000..e2ac67a
--- /dev/null
+++ b/railtrack/textures/carts_rail_curved_pwr.png
diff --git a/railtrack/textures/carts_rail_curved_sup.png b/railtrack/textures/carts_rail_curved_sup.png
new file mode 100644
index 0000000..326d544
--- /dev/null
+++ b/railtrack/textures/carts_rail_curved_sup.png
diff --git a/railtrack/textures/carts_rail_curved_swt.png b/railtrack/textures/carts_rail_curved_swt.png
new file mode 100644
index 0000000..0ed9287
--- /dev/null
+++ b/railtrack/textures/carts_rail_curved_swt.png
diff --git a/railtrack/textures/carts_rail_pwr.png b/railtrack/textures/carts_rail_pwr.png
new file mode 100644
index 0000000..95f33f6
--- /dev/null
+++ b/railtrack/textures/carts_rail_pwr.png
diff --git a/railtrack/textures/carts_rail_sup.png b/railtrack/textures/carts_rail_sup.png
new file mode 100644
index 0000000..4c812a9
--- /dev/null
+++ b/railtrack/textures/carts_rail_sup.png
diff --git a/railtrack/textures/carts_rail_swt.png b/railtrack/textures/carts_rail_swt.png
new file mode 100644
index 0000000..b7da323
--- /dev/null
+++ b/railtrack/textures/carts_rail_swt.png
diff --git a/railtrack/textures/carts_rail_t_junction_brk.png b/railtrack/textures/carts_rail_t_junction_brk.png
new file mode 100644
index 0000000..0c2c1cb
--- /dev/null
+++ b/railtrack/textures/carts_rail_t_junction_brk.png
diff --git a/railtrack/textures/carts_rail_t_junction_pwr.png b/railtrack/textures/carts_rail_t_junction_pwr.png
new file mode 100644
index 0000000..7f97fc7
--- /dev/null
+++ b/railtrack/textures/carts_rail_t_junction_pwr.png
diff --git a/railtrack/textures/carts_rail_t_junction_sup.png b/railtrack/textures/carts_rail_t_junction_sup.png
new file mode 100644
index 0000000..fbdc89c
--- /dev/null
+++ b/railtrack/textures/carts_rail_t_junction_sup.png
diff --git a/railtrack/textures/carts_rail_t_junction_swt.png b/railtrack/textures/carts_rail_t_junction_swt.png
new file mode 100644
index 0000000..b03844d
--- /dev/null
+++ b/railtrack/textures/carts_rail_t_junction_swt.png
diff --git a/railtrack/textures/default_rail.png b/railtrack/textures/default_rail.png
new file mode 100644
index 0000000..26fed02
--- /dev/null
+++ b/railtrack/textures/default_rail.png
diff --git a/railtrack/textures/railtrack_fixer.png b/railtrack/textures/railtrack_fixer.png
new file mode 100644
index 0000000..17af383
--- /dev/null
+++ b/railtrack/textures/railtrack_fixer.png
diff --git a/railtrack/textures/railtrack_inspector.png b/railtrack/textures/railtrack_inspector.png
new file mode 100644
index 0000000..671fd38
--- /dev/null
+++ b/railtrack/textures/railtrack_inspector.png