From d5480f5ff0ede03df2d212e2236e2da71c1046da Mon Sep 17 00:00:00 2001
From: Novatux <nathanael.courant@laposte.net>
Date: Thu, 14 Aug 2014 16:22:03 +0200
Subject: Major rewrite of items in tubes

---
 autoplace_tubes.lua | 108 +++++----------
 common.lua          | 144 ++++++++++++++++++++
 init.lua            |   2 +
 item_transport.lua  | 383 ++++++++++++++++++++++------------------------------
 luaentity.lua       | 335 +++++++++++++++++++++++++++++++++++++++++++++
 trashcan.lua        |  10 +-
 tubes.lua           | 271 +++++++++++++++----------------------
 7 files changed, 789 insertions(+), 464 deletions(-)
 mode change 100644 => 100755 autoplace_tubes.lua
 create mode 100755 common.lua
 mode change 100644 => 100755 init.lua
 mode change 100644 => 100755 item_transport.lua
 create mode 100755 luaentity.lua
 mode change 100644 => 100755 tubes.lua

diff --git a/autoplace_tubes.lua b/autoplace_tubes.lua
old mode 100644
new mode 100755
index c9d5d9f..42cf98b
--- a/autoplace_tubes.lua
+++ b/autoplace_tubes.lua
@@ -1,72 +1,38 @@
 -- autorouting for pneumatic tubes
 
-local function in_table(table,element)
-	for _,el in ipairs(table) do
-		if el==element then return true end
-	end
-	return false
-end
-
 local function is_tube(nodename)
-	return in_table(pipeworks.tubenodes,nodename)
-end
-
-if pipeworks == nil then
-	pipeworks = {}
+	return table.contains(pipeworks.tubenodes, nodename)
 end
 
 --a function for determining which side of the node we are on
 local function nodeside(node, tubedir)
-	if node and (node.param2 < 0 or node.param2 > 23) then node.param2 = 0 end
+	if node.param2 < 0 or node.param2 > 23 then
+		node.param2 = 0
+	end
 
-	--get a vector pointing back
 	local backdir = minetest.facedir_to_dir(node.param2)
-
-	--check whether the vector is equivalent to the tube direction; if it is, the tube's on the backside
-	if backdir.x == tubedir.x and backdir.y == tubedir.y and backdir.z == tubedir.z then
+	local back = vector.dot(backdir, tubedir)
+	if back == 1 then
 		return "back"
-	end
-
-	--check whether the vector is antiparallel with the tube direction; that indicates the front
-	if backdir.x == -tubedir.x and backdir.y == -tubedir.y and backdir.z == -tubedir.z then
+	elseif back == -1 then
 		return "front"
 	end
 
-	--facedir is defined in terms of the top-bottom axis of the node; we'll take advantage of that
-	local topdir = ({[0]={x=0, y=1, z=0},
-	{x=0, y=0, z=1},
-	{x=0, y=0, z=-1},
-	{x=1, y=0, z=0},
-	{x=-1, y=0, z=0},
-	{x=0, y=-1, z=0}})[math.floor(node.param2/4)]
-
-	--is this the top?
-	if topdir.x == tubedir.x and topdir.y == tubedir.y and topdir.z == tubedir.z then
+	local topdir = minetest.facedir_to_top_dir(node.param2)
+	local top = vector.dot(topdir, tubedir)
+	if top == 1 then
 		return "top"
-	end
-
-	--or the bottom?
-	if topdir.x == -tubedir.x and topdir.y == -tubedir.y and topdir.z == -tubedir.z then
+	elseif top == -1 then
 		return "bottom"
 	end
 
-	--we shall apply some maths to obtain the right-facing vector
-	local rightdir = {x=topdir.y*backdir.z - backdir.y*topdir.z,
-	y=topdir.z*backdir.x - backdir.z*topdir.x,
-	z=topdir.x*backdir.y - backdir.x*topdir.y}
-
-	--is this the right side?
-	if rightdir.x == tubedir.x and rightdir.y == tubedir.y and rightdir.z == tubedir.z then
+	local rightdir = minetest.facedir_to_right_dir(node.param2)
+	local right = vector.dot(rightdir, tubedir)
+	if right == 1 then
 		return "right"
-	end
-
-	--or the left?
-	if rightdir.x == -tubedir.x and rightdir.y == -tubedir.y and rightdir.z == -tubedir.z then
+	else
 		return "left"
 	end
-
-	--we should be done by now; initiate panic mode
-	minetest.log("error", "nodeside has been confused by its parameters; see pipeworks autoplace_tubes.lua, line 78")
 end
 
 local vts = {0, 3, 1, 4, 2, 5}
@@ -78,23 +44,23 @@ local function tube_autoroute(pos)
 	if not is_tube(nctr.name) then return end
 
 	local adjustments = {
-		{ x=-1, y=0, z=0 },
-		{ x=1, y=0, z=0  },
-		{ x=0, y=-1, z=0 },
-		{ x=0, y=1, z=0  },
-		{ x=0, y=0, z=-1 },
-		{ x=0, y=0, z=1 }
+		{x = -1, y =  0, z =  0},
+		{x =  1, y =  0, z =  0},
+		{x =  0, y = -1, z =  0},
+		{x =  0, y =  1, z =  0},
+		{x =  0, y =  0, z = -1},
+		{x =  0, y =  0, z =  1}
 	}
 	-- xm = 1, xp = 2, ym = 3, yp = 4, zm = 5, zp = 6
 
 	local positions = {}
 	local nodes = {}
-	for i,adj in ipairs(adjustments) do
-		positions[i] = {x=pos.x+adj.x, y=pos.y+adj.y, z=pos.z+adj.z}
+	for i, adj in ipairs(adjustments) do
+		positions[i] = vector.add(pos, adj)
 		nodes[i] = minetest.get_node(positions[i])
 	end
 
-	for i,node in ipairs(nodes) do
+	for i, node in ipairs(nodes) do
 		local idef = minetest.registered_nodes[node.name]
 		-- handle the tubes themselves
 		if is_tube(node.name) then
@@ -102,7 +68,9 @@ local function tube_autoroute(pos)
 		-- handle new style connectors
 		elseif idef and idef.tube and idef.tube.connect_sides then
 			local dir = adjustments[i]
-			if idef.tube.connect_sides[nodeside(node, {x=-dir.x, y=-dir.y, z=-dir.z})] then active[i] = 1 end
+			if idef.tube.connect_sides[nodeside(node, vector.multiply(dir, -1))] then
+				active[i] = 1
+			end
 		end
 	end
 
@@ -110,18 +78,17 @@ local function tube_autoroute(pos)
 
 	local nodedef = minetest.registered_nodes[nctr.name]
 	local basename = nodedef.basename
-	local newname
 	if nodedef.style == "old" then
 		local nsurround = ""
-		for i,n in ipairs(active) do
-			nsurround = nsurround .. n
+		for i, n in ipairs(active) do
+			nsurround = nsurround..n
 		end
 		nctr.name = basename.."_"..nsurround
 	elseif nodedef.style == "6d" then
 		local s = 0
-		for i,n in ipairs(active) do
+		for i, n in ipairs(active) do
 			if n == 1 then
-				s = s+2^vts[i]
+				s = s + 2^vts[i]
 			end
 		end
 		nctr.name = basename.."_"..tube_table[s]
@@ -131,14 +98,9 @@ local function tube_autoroute(pos)
 end
 
 function pipeworks.scan_for_tube_objects(pos)
-	if not pos or not pos.x or not pos.y or not pos.z then return end
-	tube_autoroute({ x=pos.x-1, y=pos.y  , z=pos.z   })
-	tube_autoroute({ x=pos.x+1, y=pos.y  , z=pos.z   })
-	tube_autoroute({ x=pos.x  , y=pos.y-1, z=pos.z   })
-	tube_autoroute({ x=pos.x  , y=pos.y+1, z=pos.z   })
-	tube_autoroute({ x=pos.x  , y=pos.y  , z=pos.z-1 })
-	tube_autoroute({ x=pos.x  , y=pos.y  , z=pos.z+1 })
-	tube_autoroute(pos)
+	for side = 0, 6 do
+		tube_autoroute(vector.add(pos, directions.side_to_dir(side)))
+	end
 end
 
 minetest.register_on_placenode(function(pos, newnode, placer, oldnode, itemstack)
@@ -157,7 +119,7 @@ minetest.register_on_dignode(function(pos, oldnode, digger)
 	end
 end)
 
-if minetest.get_modpath("mesecons_mvps") ~= nil then
+if minetest.get_modpath("mesecons_mvps") then
 	mesecon:register_on_mvps_move(function(moved_nodes)
 		for _, n in ipairs(moved_nodes) do
 			pipeworks.scan_for_tube_objects(n.pos)
diff --git a/common.lua b/common.lua
new file mode 100755
index 0000000..6a92198
--- /dev/null
+++ b/common.lua
@@ -0,0 +1,144 @@
+----------------------
+-- Vector functions --
+----------------------
+
+function vector.cross(a, b)
+	return {
+		x = a.y * b.z - a.z * b.y,
+		y = a.z * b.x - a.x * b.z,
+		z = a.x * b.y - a.y * b.x
+	}
+end
+
+function vector.dot(a, b)
+	return a.x * b.x + a.y * b.y + a.z * b.z
+end
+
+-----------------------
+-- Facedir functions --
+-----------------------
+
+function minetest.facedir_to_top_dir(facedir)
+	return 	({[0] = {x =  0, y =  1, z =  0},
+	                {x =  0, y =  0, z =  1},
+	                {x =  0, y =  0, z = -1},
+	                {x =  1, y =  0, z =  0},
+	                {x = -1, y =  0, z =  0},
+	                {x =  0, y = -1, z =  0}})
+		[math.floor(facedir / 4)]
+end
+
+function minetest.facedir_to_right_dir(facedir)
+	return vector.cross(
+		minetest.facedir_to_top_dir(facedir),
+		minetest.facedir_to_dir(facedir)
+	)
+end
+
+directions = {}
+function directions.side_to_dir(side)
+	return ({[0] = vector.new(),
+		vector.new( 0,  1,  0),
+		vector.new( 0, -1,  0),
+		vector.new( 1,  0,  0),
+		vector.new(-1,  0,  0),
+		vector.new( 0,  0,  1),
+		vector.new( 0,  0, -1)
+	})[side]
+end
+
+function directions.dir_to_side(dir)
+	local c = vector.dot(dir, vector.new(1, 2, 3)) + 4
+	return ({6, 2, 4, 0, 3, 1, 5})[c]
+end
+
+----------------------
+-- String functions --
+----------------------
+
+--[[function string.split(str, sep)
+	local fields = {}
+	local index = 1
+	local expr = "([^"..sep.."])+"
+	string.gsub(str, expr, function(substring)
+		fields[index] = substring
+		index = index + 1
+	end)
+	return fields
+end]]
+
+function string.startswith(str, substr)
+	return str:sub(1, substr:len()) == substr
+end
+
+---------------------
+-- Table functions --
+---------------------
+
+function table.contains(tbl, element)
+	for _, elt in pairs(tbl) do
+		if elt == element then
+			return true
+		end
+	end
+	return false
+end
+
+function table.extend(tbl, tbl2)
+	local index = #tbl + 1
+	for _, elt in ipairs(tbl2) do
+		tbl[index] = elt
+		index = index + 1
+	end
+end
+
+function table.recursive_replace(tbl, pattern, replace_with)
+	if type(tbl) == "table" then
+		local tbl2 = {}
+		for key, value in pairs(tbl) do
+			tbl2[key] = table.recursive_replace(value, pattern, replace_with)
+		end
+		return tbl2
+	elseif type(tbl) == "string" then
+		return tbl:gsub(pattern, replace_with)
+	else
+		return tbl
+	end
+end
+
+------------------------
+-- Formspec functions --
+------------------------
+
+fs_helpers = {}
+function fs_helpers.on_receive_fields(pos, fields)
+	local meta = minetest.get_meta(pos)
+	for field, value in pairs(fields) do
+		if field:startswith("fs_helpers_cycling:") then
+			local l = field:split(":")
+			local new_value = tonumber(l[2])
+			local meta_name = l[3]
+			meta:set_int(meta_name, new_value)
+		end
+	end
+end
+
+function fs_helpers.cycling_button(meta, base, meta_name, values)
+	local current_value = meta:get_int(meta_name)
+	local new_value = (current_value + 1) % (#values)
+	local text = values[current_value + 1]
+	local field = "fs_helpers_cycling:"..new_value..":"..meta_name
+	return base..";"..field..";"..text.."]"
+end
+
+---------
+-- Env --
+---------
+
+function minetest.load_position(pos)
+	if minetest.get_node_or_nil(pos) then
+		return
+	end
+	local vm = minetest.get_voxel_manip()
+	vm:read_from_map(pos, pos)
+end
\ No newline at end of file
diff --git a/init.lua b/init.lua
old mode 100644
new mode 100755
index f78b41f..b6c91d6
--- a/init.lua
+++ b/init.lua
@@ -106,9 +106,11 @@ end
 -------------------------------------------
 -- Load the various other parts of the mod
 
+dofile(pipeworks.modpath.."/common.lua")
 dofile(pipeworks.modpath.."/models.lua")
 dofile(pipeworks.modpath.."/autoplace_pipes.lua")
 dofile(pipeworks.modpath.."/autoplace_tubes.lua")
+dofile(pipeworks.modpath.."/luaentity.lua")
 dofile(pipeworks.modpath.."/item_transport.lua")
 dofile(pipeworks.modpath.."/flowing_logic.lua")
 dofile(pipeworks.modpath.."/crafts.lua")
diff --git a/item_transport.lua b/item_transport.lua
old mode 100644
new mode 100755
index f01506b..db4ffb0
--- a/item_transport.lua
+++ b/item_transport.lua
@@ -1,34 +1,17 @@
-dofile(pipeworks.modpath.."/compat.lua")
-
---and an extra function for getting the right-facing vector
-local function facedir_to_right_dir(facedir)
-	
-	--find the other directions
-	local backdir = minetest.facedir_to_dir(facedir)
-	local topdir = ({[0]={x=0, y=1, z=0},
-									{x=0, y=0, z=1},
-									{x=0, y=0, z=-1},
-									{x=1, y=0, z=0},
-									{x=-1, y=0, z=0},
-									{x=0, y=-1, z=0}})[math.floor(facedir/4)]
-	
-	--return a cross product
-		return {x=topdir.y*backdir.z - backdir.y*topdir.z,
-						y=topdir.z*backdir.x - backdir.z*topdir.x,
-						z=topdir.x*backdir.y - backdir.x*topdir.y}
-end
-
 local fakePlayer = {
     get_player_name = function() return ":pipeworks" end,
     -- any other player functions called by allow_metadata_inventory_take anywhere...
     -- perhaps a custom metaclass that errors specially when fakePlayer.<property> is not found?
 }
 
-function pipeworks.tube_item(pos, item)
+function pipeworks.tube_item(pos, start_pos, velocity, item)
 	-- Take item in any format
 	local stack = ItemStack(item)
-	local obj = minetest.add_entity(pos, "pipeworks:tubed_item")
-	obj:get_luaentity():set_item(stack:to_string())
+	local obj = luaentity.add_entity(pos, "pipeworks:tubed_item")
+	obj:set_item(stack:to_string())
+	obj.start_pos = vector.new(start_pos)
+	obj:setvelocity(velocity)
+	--obj:set_color("red") -- todo: this is test-only code
 	return obj
 end
 
@@ -52,19 +35,16 @@ local function set_filter_formspec(data, meta)
 			"item_image[0,0;1,1;pipeworks:"..data.name.."]"..
 			"label[1,0;"..minetest.formspec_escape(itemname).."]"..
 			"label[0,1;Prefer item types:]"..
-			"list[current_name;main;0,1.5;8,2;]"
-	local slotseq_mode = meta:get_int("slotseq_mode")
-	if slotseq_mode == 1 then
-		formspec = formspec .. "button[0,3.5;4,1;slotseq_mode2;Sequence slots Randomly]"
-	elseif slotseq_mode == 2 then
-		formspec = formspec .. "button[0,3.5;4,1;slotseq_mode0;Sequence slots by Rotation]"
-	else
-		formspec = formspec .. "button[0,3.5;4,1;slotseq_mode1;Sequence slots by Priority]"
-	end
-	formspec = formspec .. "list[current_player;main;0,4.5;8,4;]"
+			"list[current_name;main;0,1.5;8,2;]"..
+			fs_helpers.cycling_button(meta, "button[0,3.5;4,1", "slotseq_mode",
+				{"Sequence slots by Priority",
+				 "Sequence slots Randomly",
+				 "Sequence slots by Rotation"})..
+			"list[current_player;main;0,4.5;8,4;]"
 	meta:set_string("formspec", formspec)
 end
 
+-- todo SOON: this function has *way too many* parameters
 local function grabAndFire(data,slotseq_mode,filtmeta,frominv,frominvname,frompos,fromnode,filtername,fromtube,fromdef,dir,all)
 	local sposes = {}
 	for spos,stack in ipairs(frominv:get_list(frominvname)) do
@@ -130,10 +110,9 @@ local function grabAndFire(data,slotseq_mode,filtmeta,frominv,frominvname,frompo
 						fromdef.on_metadata_inventory_take(frompos, frominvname, spos, item, fakePlayer)
 					end
 				end
-				local item1 = pipeworks.tube_item(vector.add(frompos, vector.multiply(dir, 1.4)), item)
-				item1:get_luaentity().start_pos = vector.add(frompos, dir)
-				item1:setvelocity(dir)
-				item1:setacceleration({x=0, y=0, z=0})
+				local pos = vector.add(frompos, vector.multiply(dir, 1.4))
+				local start_pos = vector.add(frompos, dir)
+				local item1 = pipeworks.tube_item(pos, start_pos, dir, item)
 				return true-- only fire one item, please
 			end
 	end
@@ -143,8 +122,8 @@ end
 local function punch_filter(data, filtpos, filtnode)
 	local filtmeta = minetest.get_meta(filtpos)
 	local filtinv = filtmeta:get_inventory()
-	local dir = facedir_to_right_dir(filtnode.param2)
-	local frompos = {x=filtpos.x - dir.x, y=filtpos.y - dir.y, z=filtpos.z - dir.z}
+	local dir = minetest.facedir_to_right_dir(filtnode.param2)
+	local frompos = vector.subtract(filtpos, dir)
 	local fromnode = minetest.get_node(frompos)
 	if not fromnode then return end
 	local fromdef = minetest.registered_nodes[fromnode.name]
@@ -197,7 +176,7 @@ for _, data in ipairs({
 			"pipeworks_"..data.name.."_top.png",
 		},
 		paramtype2 = "facedir",
-		groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2,tubedevice=1,mesecon=2},
+		groups = {snappy = 2, choppy = 2, oddly_breakable_by_hand = 2, mesecon = 2},
 		legacy_facedir_simple = true,
 		sounds = default.node_sound_wood_defaults(),
 		on_construct = function(pos)
@@ -208,28 +187,17 @@ for _, data in ipairs({
 			inv:set_size("main", 8*2)
 		end,
 		on_receive_fields = function(pos, formname, fields, sender)
+			fs_helpers.on_receive_fields(pos, fields)
 			local meta = minetest.get_meta(pos)
-			for k, _ in pairs(fields) do
-				if k:sub(1, 12) == "slotseq_mode" then
-					local mode = tonumber(k:sub(13, 13))
-					meta:set_int("slotseq_mode", mode)
-					meta:set_int("slotseq_index", mode == 2 and 1 or 0)
-				end
-			end
+			meta:set_int("slotseq_index", 1)
 			set_filter_formspec(data, meta)
 			set_filter_infotext(data, meta)
 		end,
-		can_dig = function(pos,player)
+		can_dig = function(pos, player)
 			local meta = minetest.get_meta(pos)
 			local inv = meta:get_inventory()
 			return inv:is_empty("main")
 		end,
-		after_place_node = function(pos)
-			pipeworks.scan_for_tube_objects(pos)
-		end,
-		after_dig_node = function(pos)
-			pipeworks.scan_for_tube_objects(pos)
-		end,
 		mesecons = {
 			effector = {
 				action_on = function(pos, node)
@@ -237,21 +205,13 @@ for _, data in ipairs({
 				end,
 			},
 		},
-		tube={connect_sides={right=1}},
+		tube = {connect_sides = {right = 1}},
 		on_punch = function (pos, node, puncher)
 			punch_filter(data, pos, node)
 		end,
 	})
 end
 
-local function roundpos(pos)
-	return {x=math.floor(pos.x+0.5),y=math.floor(pos.y+0.5),z=math.floor(pos.z+0.5)}
-end
-
-local function addVect(pos,vect)
-	return {x=pos.x+vect.x,y=pos.y+vect.y,z=pos.z+vect.z}
-end
-
 local adjlist={{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=0,y=1,z=0},{x=0,y=-1,z=0},{x=1,y=0,z=0},{x=-1,y=0,z=0}}
 
 function pipeworks.notvel(tbl, vel)
@@ -263,18 +223,20 @@ function pipeworks.notvel(tbl, vel)
 end
 
 local function go_next(pos, velocity, stack)
-	local chests = {}
-	local tubes = {}
+	local next_positions = {}
+	local max_priority = 0
 	local cnode = minetest.get_node(pos)
 	local cmeta = minetest.get_meta(pos)
-	local n
 	local can_go
 	local speed = math.abs(velocity.x + velocity.y + velocity.z)
+	if speed == 0 then
+		speed = 1
+	end
 	local vel = {x = velocity.x/speed, y = velocity.y/speed, z = velocity.z/speed,speed=speed}
 	if speed >= 4.1 then
 		speed = 4
 	elseif speed >= 1.1 then
-		speed = speed-0.1
+		speed = speed - 0.1
 	else
 		speed = 1
 	end
@@ -284,58 +246,40 @@ local function go_next(pos, velocity, stack)
 	else
 		can_go = pipeworks.notvel(adjlist, vel)
 	end
-	local meta = nil
-	for _,vect in ipairs(can_go) do
-		local npos = addVect(pos,vect)
+	for _, vect in ipairs(can_go) do
+		local npos = vector.add(pos, vect)
 		local node = minetest.get_node(npos)
-		local tube_receiver = minetest.get_item_group(node.name,"tubedevice_receiver")
-		meta = minetest.get_meta(npos)
-		local tubelike = meta:get_int("tubelike")
-		if tube_receiver == 1 then
-			if minetest.registered_nodes[node.name].tube and
-				minetest.registered_nodes[node.name].tube.can_insert and
-				minetest.registered_nodes[node.name].tube.can_insert(npos, node, stack, vect) then
-				local i = #chests + 1
-				chests[i] = {}
-				chests[i].pos = npos
-				chests[i].vect = vect
+		local tubedevice = minetest.get_item_group(node.name, "tubedevice")
+		local tube_def = minetest.registered_nodes[node.name].tube
+		local tube_priority = (tube_def and tube_def.priority) or 100
+		if tubedevice > 0 and tube_priority >= max_priority then
+			if not tube_def or not tube_def.can_insert or
+					tubedef.can_insert(npos, node, stack, vect) then
+				if tube_priority > max_priority then
+					max_priority = tube_priority
+					next_positions = {}
+				end
+				next_positions[#next_positions + 1] = {pos = npos, vect = vect}
 			end
-		elseif tubelike == 1 then
-			local i = #tubes + 1
-			tubes[i] = {}
-			tubes[i].pos = npos
-			tubes[i].vect = vect
 		end
 	end
-	if chests[1] == nil then--no chests found
-		if tubes[1] == nil then
-			return 0
-		else
-			n = (cmeta:get_int("tubedir")%(#tubes)) + 1
-			if pipeworks.enable_cyclic_mode then
-				cmeta:set_int("tubedir",n)
-			end
-			velocity.x = tubes[n].vect.x*vel.speed
-			velocity.y = tubes[n].vect.y*vel.speed
-			velocity.z = tubes[n].vect.z*vel.speed
-		end
-	else
-		n = (cmeta:get_int("tubedir")%(#chests))+1
-		if pipeworks.enable_cyclic_mode then
-			cmeta:set_int("tubedir",n)
-		end
-		velocity.x = chests[n].vect.x*speed
-		velocity.y = chests[n].vect.y*speed
-		velocity.z = chests[n].vect.z*speed
+
+	if not next_positions[1] then
+		return false, nil
+	end
+	
+	local n = (cmeta:get_int("tubedir") % (#next_positions)) + 1
+	if pipeworks.enable_cyclic_mode then
+		cmeta:set_int("tubedir", n)
 	end
-	return 1
+	local new_velocity = vector.multiply(next_positions[n].vect, vel.speed)
+	return true, new_velocity
 end
 
 minetest.register_entity("pipeworks:tubed_item", {
 	initial_properties = {
 		hp_max = 1,
 		physical = false,
---		collisionbox = {0,0,0,0,0,0},
 		collisionbox = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1},
 		visual = "wielditem",
 		visual_size = {x = 0.15, y = 0.15},
@@ -343,113 +287,126 @@ minetest.register_entity("pipeworks:tubed_item", {
 		spritediv = {x = 1, y = 1},
 		initial_sprite_basepos = {x = 0, y = 0},
 		is_visible = false,
-		start_pos = {},
-		route = {},
-		removed = false
 	},
-	
-	itemstring = '',
+
 	physical_state = false,
 
-	set_item = function(self, itemstring)
-		self.itemstring = itemstring
+	from_data = function(self, itemstring)
 		local stack = ItemStack(itemstring)
+		local itemtable = stack:to_table()
+		local itemname = nil
+		if itemtable then
+			itemname = stack:to_table().name
+		end
+		local item_texture = nil
+		local item_type = ""
+		if minetest.registered_items[itemname] then
+			item_texture = minetest.registered_items[itemname].inventory_image
+			item_type = minetest.registered_items[itemname].type
+		end
 		self.object:set_properties({
 			is_visible = true,
-			textures = { stack:get_name() },
+			textures = {stack:get_name()}
 		})
 		local def = stack:get_definition()
 		self.object:setyaw((def and def.type == "node") and 0 or math.pi * 0.25)
 	end,
 
-	get_staticdata = function(self)
-		if self.start_pos == nil or self.removed then
-			return
-		end
-		local velocity = self.object:getvelocity()
-		self.object:setpos(self.start_pos)
-		return	minetest.serialize({
-			itemstring = self.itemstring,
-			velocity = velocity,
-			start_pos = self.start_pos
-		})
+	get_staticdata = luaentity.get_staticdata,
+	on_activate = luaentity.on_activate,
+})
+
+minetest.register_entity("pipeworks:color_entity", {
+	initial_properties = {
+		hp_max = 1,
+		physical = false,
+		collisionbox = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1},
+		visual = "cube",
+		visual_size = {x = 3.5, y = 3.5, z = 3.5}, -- todo: find correct size
+		textures = {""},
+		is_visible = false,
+	},
+
+	physical_state = false,
+
+	from_data = function(self, color)
+		local t = "pipeworks_color_"..color..".png"
+		local prop = {
+			is_visible = true,
+			visual = "cube",
+			textures = {t, t, t, t, t, t} -- todo: textures
+		}
+		self.object:set_properties(prop)
 	end,
 
-	on_activate = function(self, staticdata)
-		if  staticdata=="" or staticdata==nil then return end
-		local item = minetest.deserialize(staticdata)
-		local stack = ItemStack(item.itemstring)
-		local itemtable = stack:to_table()
-		local itemname = nil
-		if itemtable then
-			itemname = stack:to_table().name
+	get_staticdata = luaentity.get_staticdata,
+	on_activate = luaentity.on_activate,
+})
+
+luaentity.register_entity("pipeworks:tubed_item", {
+	itemstring = '',
+	item_entity = nil,
+	color_entity = nil,
+	color = nil,
+	start_pos = nil,
+
+	set_item = function(self, item)
+		local itemstring = ItemStack(item):to_string() -- Accept any input format
+		if self.itemstring == itemstring then
+			return
 		end
-		
-		if itemname then 
-		self.start_pos=item.start_pos
-		self.object:setvelocity(item.velocity)
-		self.object:setacceleration({x=0, y=0, z=0})
-		self.object:setpos(item.start_pos)
+		if self.item_entity then
+			self:remove_attached_entity(self.item_entity)
 		end
-		self:set_item(item.itemstring)
+		self.itemstring = itemstring
+		self.item_entity = self:add_attached_entity("pipeworks:tubed_item", itemstring)
 	end,
 	
-	remove = function(self)
-		self.object:remove()
-		self.removed = true
-		self.itemstring = ''
+	set_color = function(self, color)
+		if self.color == color then
+			return
+		end
+		self.color = color
+		if self.color_entity then
+			self:remove_attached_entity(self.color_entity)
+		end
+		if color then
+			self.color_entity = self:add_attached_entity("pipeworks:color_entity", color)
+		else
+			self.color_entity = nil
+		end
 	end,
 
 	on_step = function(self, dtime)
-		if self.removed then
-			return
-		end
 		if self.start_pos == nil then
-			local pos = self.object:getpos()
-			self.start_pos = roundpos(pos)
+			local pos = self:getpos()
+			self.start_pos = vector.round(pos)
+			self:setpos(pos)
 		end
-		local pos = self.object:getpos()
-		local node = minetest.get_node(pos)
-		local meta = minetest.get_meta(pos)
-		local tubelike = meta:get_int("tubelike")
+		
+		local pos = self:getpos()
 		local stack = ItemStack(self.itemstring)
-		local drop_pos = nil
+		local drop_pos
 		
-		local velocity = self.object:getvelocity()
-	
-		if velocity == nil then return end
-	
-		local velocitycopy = {x = velocity.x, y = velocity.y, z = velocity.z}
+		local velocity = self:getvelocity()
 		
 		local moved = false
 		local speed = math.abs(velocity.x + velocity.y + velocity.z)
+		if speed == 0 then
+			speed = 1
+			moved = true
+		end
 		local vel = {x = velocity.x / speed, y = velocity.y / speed, z = velocity.z / speed, speed = speed}
 		
-		if math.abs(vel.x) == 1 then
-			local next_node = math.abs(pos.x - self.start_pos.x)
-			if next_node >= 1 then 
-				self.start_pos.x = self.start_pos.x + vel.x
-				moved = true
-			end
-		elseif math.abs(vel.y) == 1 then
-		local next_node = math.abs(pos.y - self.start_pos.y)
-			if next_node >= 1 then 
-				self.start_pos.y = self.start_pos.y + vel.y
-				moved = true
-			end	
-		elseif math.abs(vel.z) == 1 then
-			local next_node = math.abs(pos.z - self.start_pos.z)
-			if next_node >= 1 then 
-				self.start_pos.z = self.start_pos.z + vel.z
-				moved = true
-			end
+		if vector.distance(pos, self.start_pos) >= 1 then
+			self.start_pos = vector.add(self.start_pos, vel)
+			moved = true
 		end
 		
-		local sposcopy = {x = self.start_pos.x, y = self.start_pos.y, z = self.start_pos.z}
-		
-		node = minetest.get_node(self.start_pos)
+		minetest.load_position(self.start_pos)
+		local node = minetest.get_node(self.start_pos)
 		if moved and minetest.get_item_group(node.name, "tubedevice_receiver") == 1 then
-			local leftover = nil
+			local leftover
 			if minetest.registered_nodes[node.name].tube and minetest.registered_nodes[node.name].tube.insert_object then
 				leftover = minetest.registered_nodes[node.name].tube.insert_object(self.start_pos, node, stack, vel)
 			else
@@ -459,62 +416,48 @@ minetest.register_entity("pipeworks:tubed_item", {
 				self:remove()
 				return
 			end
-			velocity.x = -velocity.x
-			velocity.y = -velocity.y
-			velocity.z = -velocity.z
-			self.object:setvelocity(velocity)
+			velocity = vector.multiply(velocity, -1)
+			self:setvelocity(velocity)
 			self:set_item(leftover:to_string())
 			return
 		end
 		
 		if moved then
-			if go_next (self.start_pos, velocity, stack) == 0 then
+			local found_next, new_velocity = go_next(self.start_pos, velocity, stack) -- todo: color
+			if not found_next then
 				drop_pos = minetest.find_node_near(vector.add(self.start_pos, velocity), 1, "air")
 				if drop_pos then 
 					minetest.item_drop(stack, "", drop_pos)
 					self:remove()
+					return
 				end
 			end
-		end
-		
-		if velocity.x~=velocitycopy.x or velocity.y~=velocitycopy.y or velocity.z~=velocitycopy.z or 
-				self.start_pos.x~=sposcopy.x or self.start_pos.y~=sposcopy.y or self.start_pos.z~=sposcopy.z then
-			self.object:setpos(self.start_pos)
-			self.object:setvelocity(velocity)
+			
+			if new_velocity and not vector.equals(velocity, new_velocity) then
+				self:setpos(self.start_pos)
+				self:setvelocity(new_velocity)
+			end
 		end
 	end
 })
 
-if minetest.get_modpath("mesecons_mvps") ~= nil then
-	local function add_table(table,toadd)
-		local i = 1
-		while true do
-			o = table[i]
-			if o == toadd then return end
-			if o == nil then break end
-			i = i+1
-		end
-		table[i] = toadd
-	end
+if minetest.get_modpath("mesecons_mvps") then
 	mesecon:register_mvps_unmov("pipeworks:tubed_item")
+	mesecon:register_mvps_unmov("pipeworks:color_entity")
 	mesecon:register_on_mvps_move(function(moved_nodes)
-		local objects_to_move = {}
+		local moved = {}
 		for _, n in ipairs(moved_nodes) do
-			local objects = minetest.get_objects_inside_radius(n.oldpos, 1)
-			for _, obj in ipairs(objects) do
-				local entity = obj:get_luaentity()
-				if entity and entity.name == "pipeworks:tubed_item" then
-					--objects_to_move[#objects_to_move+1] = obj
-					add_table(objects_to_move, obj)
-				end
-			end
+			moved[minetest.hash_node_position(n.oldpos)] = vector.subtract(n.pos, n.oldpos)
 		end
-		if #objects_to_move > 0 then
-			local dir = vector.subtract(moved_nodes[1].pos, moved_nodes[1].oldpos)
-			for _, obj in ipairs(objects_to_move) do
-				local entity = obj:get_luaentity()
-				obj:setpos(vector.add(obj:getpos(), dir))
-				entity.start_pos = vector.add(entity.start_pos, dir)
+		for id, entity in pairs(luaentity.entities) do
+			if entity.name == "pipeworks:tubed_item" then
+				local pos = entity:getpos()
+				local rpos = vector.round(pos)
+				local dir = moved[minetest.hash_node_position(rpos)]
+				if dir then
+					entity:setpos(vector.add(pos, dir))
+					entity.start_pos = vector.add(entity.start_pos, dir)
+				end
 			end
 		end
 	end)
diff --git a/luaentity.lua b/luaentity.lua
new file mode 100755
index 0000000..a4ef4a0
--- /dev/null
+++ b/luaentity.lua
@@ -0,0 +1,335 @@
+local max_entity_id = 1000000000000 -- If you need more, there's a problem with your code
+
+luaentity = {}
+
+luaentity.registered_entities = {}
+
+local filename = minetest.get_worldpath().."/luaentities"
+local function read_file()
+	local f = io.open(filename, "r")
+	if f == nil then return {} end
+    	local t = f:read("*all")
+    	f:close()
+	if t == "" or t == nil then return {} end
+	return minetest.deserialize(t)
+end
+
+local function write_file(tbl)
+	local f = io.open(filename, "w")
+    	f:write(minetest.serialize(tbl))
+    	f:close()
+end
+
+local function read_entities()
+	local t = read_file()
+	for _, entity in pairs(t) do
+		setmetatable(entity, luaentity.registered_entities[entity.name])
+	end
+	return t
+end
+
+local function write_entities()
+	for _, entity in pairs(luaentity.entities) do
+		setmetatable(entity, nil)
+		for _, attached in pairs(entity._attached_entities) do
+			if attached.entity then
+				attached.entity:remove()
+				attached.entity = nil
+			end
+		end
+		entity._attached_entities_master = nil
+	end
+	write_file(luaentity.entities)
+end
+
+minetest.after(0, function()
+	luaentity.entities = read_entities()
+end)
+minetest.register_on_shutdown(write_entities)
+ -- todo: load that from file (datastorage?) -> don't forget about metatables (are those serialized?) / do not blindly save -> the attached_entities have to be removed
+luaentity.entities_index = 0
+
+local function get_blockpos(pos)
+	return {x = math.floor(pos.x / 16),
+	        y = math.floor(pos.y / 16),
+	        z = math.floor(pos.z / 16)}
+end
+
+local active_blocks = {} -- These only contain active blocks near players (i.e., not forceloaded ones)
+local handle_active_blocks_step = 2
+local handle_active_blocks_timer = 0
+minetest.register_globalstep(function(dtime)
+	handle_active_blocks_timer = handle_active_blocks_timer + dtime
+	if handle_active_blocks_timer >= handle_active_blocks_step then
+		handle_active_blocks_timer = handle_active_blocks_timer - handle_active_blocks_step
+		local active_block_range = tonumber(minetest.setting_get("active_block_range"))
+		local new_active_blocks = {}
+		for _, player in ipairs(minetest.get_connected_players()) do
+			local blockpos = get_blockpos(player:getpos())
+			local minp = vector.subtract(blockpos, active_block_range)
+			local maxp = vector.add(blockpos, active_block_range)
+
+			for x = minp.x, maxp.x do
+			for y = minp.y, maxp.y do
+			for z = minp.z, maxp.z do
+				local pos = {x = x, y = y, z = z}
+				new_active_blocks[minetest.hash_node_position(pos)] = pos
+			end
+			end
+			end
+		end
+		active_blocks = new_active_blocks
+		-- todo: callbacks on block load/unload
+	end
+end)
+
+local function is_active(pos)
+	return active_blocks[minetest.hash_node_position(get_blockpos(pos))] ~= nil
+end
+
+local entitydef_default = {
+	_attach = function(self, attached, attach_to)
+		local attached_def = self._attached_entities[attached]
+		local attach_to_def = self._attached_entities[attach_to]
+		attached_def.entity:set_attach(
+			attach_to_def.entity, "",
+			vector.subtract(attached_def.offset, attach_to_def.offset), -- todo: Does not work because is object space
+			vector.new(0, 0, 0)
+		)
+	end,
+	_set_master = function(self, index)
+		self._attached_entities_master = index
+		if not index then
+			return
+		end
+		local def = self._attached_entities[index]
+		if not def.entity then
+			return
+		end
+		def.entity:setpos(vector.add(self._pos, def.offset))
+		def.entity:setvelocity(self._velocity)
+		def.entity:setacceleration(self._acceleration)
+	end,
+	_attach_all = function(self)
+		local master = self._attached_entities_master
+		if not master then
+			return
+		end
+		for id, entity in pairs(self._attached_entities) do
+			if id ~= master and entity.entity then
+				self:_attach(id, master)
+			end
+		end
+	end,
+	_detach_all = function(self)
+		local master = self._attached_entities_master
+		for id, entity in pairs(self._attached_entities) do
+			if id ~= master and entity.entity then
+				entity.entity:set_detach()
+			end
+		end
+	end,
+	_add_attached = function(self, index)
+		local entity = self._attached_entities[index]
+		if entity.entity then
+			return
+		end
+		local entity_pos = vector.add(self._pos, entity.offset)
+		if not is_active(entity_pos) then
+			return
+		end
+		local ent = minetest.add_entity(entity_pos, entity.name):get_luaentity()
+		ent:from_data(entity.data)
+		ent.parent_id = self._id
+		ent.attached_id = index
+		entity.entity = ent.object
+		local master = self._attached_entities_master
+		if master then
+			self:_attach(index, master)
+		else
+			self:_set_master(index)
+		end
+	end,
+	_remove_attached = function(self, index)
+		local master = self._attached_entities_master
+		local entity = self._attached_entities[index]
+		local ent = entity.entity
+		entity.entity = nil
+		if index == master then
+			self:_detach_all()
+			local newmaster
+			for id, attached in pairs(self._attached_entities) do
+				if id ~= master and attached.entity then
+					newmaster = id
+					break
+				end
+			end
+			self:_set_master(newmaster)
+			self:_attach_all()
+		elseif master and ent then
+			ent:set_detach()
+		end
+		if ent then
+			ent:remove()
+		end
+	end,
+	_add_loaded = function(self)
+		for id, _ in pairs(self._attached_entities) do
+			self:_add_attached(id)
+		end
+	end,
+	getid = function(self)
+		return self._id
+	end,
+	getpos = function(self)
+		return vector.new(self._pos)
+	end,
+	setpos = function(self, pos)
+		self._pos = vector.new(pos)
+		--for _, entity in pairs(self._attached_entities) do
+		--	if entity.entity then
+		--		entity.entity:setpos(vector.add(self._pos, entity.offset))
+		--	end
+		--end
+		local master = self._attached_entities_master
+		if master then
+			local master_def = self._attached_entities[master]
+			master_def.entity:setpos(vector.add(self._pos, master_def.offset))
+		end
+	end,
+	getvelocity = function(self)
+		return vector.new(self._velocity)	
+	end,
+	setvelocity = function(self, velocity)
+		self._velocity = vector.new(velocity)
+		local master = self._attached_entities_master
+		if master then
+			self._attached_entities[master].entity:setvelocity(self._velocity)
+		end
+	end,
+	getacceleration = function(self)
+		return vector.new(self._acceleration)
+	end,
+	setacceleration = function(self, acceleration)
+		self._acceleration = vector.new(acceleration)
+		local master = self._attached_entities_master
+		if master then
+			self._attached_entities[master].entity:setacceleration(self._acceleration)
+		end
+	end,
+	remove = function(self)
+		self:_detach_all()
+		for _, entity in pairs(self._attached_entities) do
+			if entity.entity then
+				entity.entity:remove()
+			end
+		end
+		luaentity.entities[self._id] = nil
+	end,
+	add_attached_entity = function(self, name, data, offset)
+		local index = #self._attached_entities + 1
+		self._attached_entities[index] = {
+			name = name,
+			data = data,
+			offset = vector.new(offset),
+		}
+		self:_add_attached(index)
+		return index
+	end,
+	remove_attached_entity = function(self, index)
+		self:_remove_attached(index)
+		self._attached_entities[index] = nil
+	end,
+}
+
+function luaentity.register_entity(name, prototype)
+	-- name = check_modname_prefix(name)
+	prototype.name = name
+	setmetatable(prototype, {__index = entitydef_default})
+	prototype.__index = prototype -- Make it possible to use it as metatable
+	luaentity.registered_entities[name] = prototype
+end
+
+-- function luaentity.get_entity_definition(entity)
+--	 return luaentity.registered_entities[entity.name]
+-- end
+
+function luaentity.add_entity(pos, name)
+	local index = luaentity.entities_index
+	while luaentity.entities[index] do
+		index = index + 1
+		if index >= max_entity_id then
+			index = 0
+		end
+	end
+	luaentity.entities_index = index
+
+	local entity = {
+		name = name,
+		_id = index,
+		_pos = vector.new(pos),
+		_velocity = {x = 0, y = 0, z = 0},
+		_acceleration = {x = 0, y = 0, z = 0},
+		_attached_entities = {},
+	}
+	
+	local prototype = luaentity.registered_entities[name]
+	setmetatable(entity, prototype) -- Default to prototype for other methods
+	luaentity.entities[index] = entity
+
+	if entity.on_activate then
+		entity:on_activate()
+	end
+	return entity
+end
+
+-- todo: check if remove in get_staticdata works
+function luaentity.get_staticdata(self)
+	local parent = luaentity.entities[self.parent_id]
+	if parent and parent._remove_attached then
+		parent:_remove_attached(self.attached_id)
+	end
+	return "toremove"
+end
+
+function luaentity.on_activate(self, staticdata)
+	if staticdata == "toremove" then
+		self.object:remove()
+	end
+end
+
+function luaentity.get_objects_inside_radius(pos, radius)
+	local objects = {}
+	local index = 1
+	for id, entity in pairs(luaentity.entities) do
+		if vector.distance(pos, entity:getpos()) <= radius then
+			objects[index] = entity
+			index = index + 1
+		end
+	end
+end
+
+minetest.register_globalstep(function(dtime)
+	for id, entity in pairs(luaentity.entities) do
+		local master = entity._attached_entities_master
+		if master then
+			local master_def = entity._attached_entities[master]
+			local master_entity = master_def.entity
+			entity._pos = vector.subtract(master_entity:getpos(), master_def.offset)
+			entity._velocity = master_entity:getvelocity()
+			entity._acceleration = master_entity:getacceleration()
+		else
+			entity._pos = vector.add(vector.add(
+				entity._pos,
+				vector.multiply(entity._velocity, dtime)),
+				vector.multiply(entity._acceleration, 0.5 * dtime * dtime))
+			entity._velocity = vector.add(
+				entity._velocity,
+				vector.multiply(entity._acceleration, dtime))
+		end
+		entity:_add_loaded()
+		if entity.on_step then
+			entity:on_step(dtime)
+		end
+	end
+end)
diff --git a/trashcan.lua b/trashcan.lua
index 880ab59..fdec79f 100644
--- a/trashcan.lua
+++ b/trashcan.lua
@@ -9,15 +9,13 @@ minetest.register_node("pipeworks:trashcan", {
 		"pipeworks_trashcan_side.png",
 		"pipeworks_trashcan_side.png",
 	}, 
-	groups = { snappy = 3, tubedevice = 1, tubedevice_receiver = 1 }, 
+	groups = {snappy = 3, tubedevice = 1, tubedevice_receiver = 1}, 
 	tube = {
 		insert_object = function(pos, node, stack, direction)
 			return ItemStack("")
-		end, 
-		can_insert = function(pos, node, stack, direction)
-			return true
-		end, 
-		connect_sides = { left = 1, right = 1, front = 1, back = 1, top = 1, bottom = 1 },
+		end,
+		connect_sides = {left = 1, right = 1, front = 1, back = 1, top = 1, bottom = 1},
+		priority = 1, -- Lower than anything else
 	}, 
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
diff --git a/tubes.lua b/tubes.lua
old mode 100644
new mode 100755
index 97f0237..c0375ef
--- a/tubes.lua
+++ b/tubes.lua
@@ -20,7 +20,7 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 	end
 	
 	for _, v in ipairs(connects) do
-		pipeworks.add_node_box(outboxes, pipeworks.tube_boxes[v])
+		table.extend(outboxes, pipeworks.tube_boxes[v])
 		table.insert(outsel, pipeworks.tube_selectboxes[v])
 		outimgs[vti[v]] = noctrs[v]
 	end
@@ -31,13 +31,13 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 		outimgs[vti[v]] = ends[v]
 	end
 
-	local tgroups = {snappy = 3, tube = 1, not_in_creative_inventory = 1}
+	local tgroups = {snappy = 3, tube = 1, tubedevice = 1, not_in_creative_inventory = 1}
 	local tubedesc = desc.." "..dump(connects).."... You hacker, you."
 	local iimg = plain[1]
 	local wscale = {x = 1, y = 1, z = 1}
 
 	if #connects == 0 then
-		tgroups = {snappy = 3, tube = 1}
+		tgroups = {snappy = 3, tube = 1, tubedevice = 1}
 		tubedesc = desc
 		iimg=inv
 		outimgs = {
@@ -50,7 +50,8 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 		wscale = {x = 1, y = 1, z = 0.01}
 	end
 	
-	table.insert(pipeworks.tubenodes, name.."_"..tname)
+	local rname = name.."_"..tname
+	table.insert(pipeworks.tubenodes, rname)
 	
 	local nodedef = {
 		description = tubedesc,
@@ -62,7 +63,7 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 		wield_scale = wscale,
 		paramtype = "light",
 		selection_box = {
-	             	type = "fixed",
+			type = "fixed",
 			fixed = outsel
 		},
 		node_box = {
@@ -77,26 +78,22 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 		style = style,
 		drop = name.."_"..dropname,
 		tubelike = 1,
-		tube = {connect_sides = {front = 1, back = 1, left = 1, right = 1, top = 1, bottom = 1}},
-		on_construct = function(pos)
-			local meta = minetest.get_meta(pos)
-			meta:set_int("tubelike", 1)
-			if minetest.registered_nodes[name.."_"..tname].on_construct_ then
-				minetest.registered_nodes[name.."_"..tname].on_construct_(pos)
-			end
-		end,
-		after_place_node = function(pos)
+		tube = {
+			connect_sides = {front = 1, back = 1, left = 1, right = 1, top = 1, bottom = 1},
+			priority = 50
+		},
+		--[[after_place_node = function(pos)
 			pipeworks.scan_for_tube_objects(pos)
-			if minetest.registered_nodes[name.."_"..tname].after_place_node_ then
-				minetest.registered_nodes[name.."_"..tname].after_place_node_(pos)
+			if minetest.registered_nodes[rname].after_place_node_ then
+				minetest.registered_nodes[rname].after_place_node_(pos)
 			end
 		end,
 		after_dig_node = function(pos)
 			pipeworks.scan_for_tube_objects(pos)
-			if minetest.registered_nodes[name.."_"..tname].after_dig_node_ then
-				minetest.registered_nodes[name.."_"..tname].after_dig_node_(pos)
+			if minetest.registered_nodes[rname].after_dig_node_ then
+				minetest.registered_nodes[rname].after_dig_node_(pos)
 			end
-		end
+		end]]
 	}
 	if style == "6d" then
 		nodedef.paramtype2 = "facedir"
@@ -105,9 +102,9 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 	if special == nil then special = {} end
 
 	for key, value in pairs(special) do
-		if key == "on_construct" or key == "after_dig_node" or key == "after_place_node" then
-			nodedef[key.."_"] = value
-		elseif key == "groups" then
+		--if key == "after_dig_node" or key == "after_place_node" then
+		--	nodedef[key.."_"] = value
+		if key == "groups" then
 			for group, val in pairs(value) do
 				nodedef.groups[group] = val
 			end
@@ -115,19 +112,12 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 			for key, val in pairs(value) do
 				nodedef.tube[key] = val
 			end
-		elseif type(value) == "table" then
-			nodedef[key] = pipeworks.replace_name(value, "#id", tname)
-		elseif type(value) == "string" then
-			nodedef[key] = string.gsub(value, "#id", tname)
 		else
-			nodedef[key] = value
+			nodedef[key] = table.recursive_replace(value, "#id", tname)
 		end
 	end
 
-	local prefix = ":"
-	if string.find(name, "pipeworks:") then prefix = "" end
-
-	minetest.register_node(prefix..name.."_"..tname, nodedef)
+	minetest.register_node(rname, nodedef)
 end
 
 pipeworks.register_tube = function(name, desc, plain, noctrs, ends, short, inv, special, old_registration)
@@ -181,22 +171,18 @@ pipeworks.register_tube = function(name, desc, plain, noctrs, ends, short, inv,
 				wield_image = inv,
 				paramtype = "light",
 				sunlight_propagates = true,
-				description = desc.." (legacy)",
-				on_construct = function(pos)
-					local meta = minetest.get_meta(pos)
-					meta:set_int("tubelike", 1)
-				end,
-				after_place_node = function(pos)
+				description = "Pneumatic tube segment (legacy)",
+				--[[after_place_node = function(pos)
 					pipeworks.scan_for_tube_objects(pos)
 					if minetest.registered_nodes[name.."_1"].after_place_node_ then
 						minetest.registered_nodes[name.."_1"].after_place_node_(pos)
 					end
-				end,
-				groups = {not_in_creative_inventory = 1, tube_to_update = 1},
+				end,]]
+				groups = {not_in_creative_inventory = 1, tube_to_update = 1, tube = 1},
 				tube = {connect_sides = {front = 1, back = 1, left = 1, right = 1, top = 1, bottom = 1}},
 				drop = name.."_1",
 			})
-			table.insert(pipeworks.tubenodes,cname)
+			table.insert(pipeworks.tubenodes, cname)
 			for xm = 0, 1 do
 			for xp = 0, 1 do
 			for ym = 0, 1 do
@@ -221,8 +207,8 @@ if REGISTER_COMPATIBILITY then
 		interval = 1,
 		chance = 1,
 		action = function(pos, node, active_object_count, active_object_count_wider)
-			local minp = {x = pos.x-1, y = pos.y-1, z = pos.z-1}
-			local maxp = {x = pos.x+1, y = pos.y+1, z = pos.z+1}
+			local minp = vector.subtract(pos, 1)
+			local maxp = vector.add(pos, 1)
 			if table.getn(minetest.find_nodes_in_area(minp, maxp, "ignore")) == 0 then
 				pipeworks.scan_for_tube_objects(pos)
 			end
@@ -241,7 +227,7 @@ local end_textures = {"pipeworks_tube_end.png", "pipeworks_tube_end.png", "pipew
 local short_texture = "pipeworks_tube_short.png"
 local inv_texture = "pipeworks_tube_inv.png"
 
-pipeworks.register_tube("pipeworks:tube", "Pneumatic Tube Segment", plain_textures, noctr_textures, end_textures, short_texture, inv_texture)
+pipeworks.register_tube("pipeworks:tube", "Pneumatic tube segment", plain_textures, noctr_textures, end_textures, short_texture, inv_texture)
 
 if pipeworks.enable_mese_tube then
 	local mese_noctr_textures = {"pipeworks_mese_tube_noctr_1.png", "pipeworks_mese_tube_noctr_2.png", "pipeworks_mese_tube_noctr_3.png",
@@ -252,6 +238,39 @@ if pipeworks.enable_mese_tube then
 				   "pipeworks_mese_tube_end.png", "pipeworks_mese_tube_end.png", "pipeworks_mese_tube_end.png"}
 	local mese_short_texture = "pipeworks_mese_tube_short.png"
 	local mese_inv_texture = "pipeworks_mese_tube_inv.png"
+	local function update_formspec(pos)
+		local meta = minetest.get_meta(pos)
+		local old_formspec = meta:get_string("formspec")
+		if string.find(old_formspec, "button0") then -- Old version
+			local inv = meta:get_inventory()
+			for i = 1, 6 do
+				for _, stack in ipairs(inv:get_list("line"..i)) do
+					minetest.item_drop(stack, "", pos)
+				end
+			end
+		end
+		meta:set_string("formspec",
+			"size[8,11]"..
+			"list[current_name;line1;1,0;6,1;]"..
+			"list[current_name;line2;1,1;6,1;]"..
+			"list[current_name;line3;1,2;6,1;]"..
+			"list[current_name;line4;1,3;6,1;]"..
+			"list[current_name;line5;1,4;6,1;]"..
+			"list[current_name;line6;1,5;6,1;]"..
+			"image[0,0;1,1;pipeworks_white.png]"..
+			"image[0,1;1,1;pipeworks_black.png]"..
+			"image[0,2;1,1;pipeworks_green.png]"..
+			"image[0,3;1,1;pipeworks_yellow.png]"..
+			"image[0,4;1,1;pipeworks_blue.png]"..
+			"image[0,5;1,1;pipeworks_red.png]"..
+			fs_helpers.cycling_button(meta, "button[7,0;1,1", "b1s", {"Off", "On"})..
+			fs_helpers.cycling_button(meta, "button[7,1;1,1", "b2s", {"Off", "On"})..
+			fs_helpers.cycling_button(meta, "button[7,2;1,1", "b3s", {"Off", "On"})..
+			fs_helpers.cycling_button(meta, "button[7,3;1,1", "b4s", {"Off", "On"})..
+			fs_helpers.cycling_button(meta, "button[7,4;1,1", "b5s", {"Off", "On"})..
+			fs_helpers.cycling_button(meta, "button[7,5;1,1", "b6s", {"Off", "On"})..
+			"list[current_player;main;0,7;8,4;]")
+	end
 	pipeworks.register_tube("pipeworks:mese_tube", "Sorting Pneumatic Tube Segment", mese_plain_textures, mese_noctr_textures,
 				mese_end_textures, mese_short_texture, mese_inv_texture,
 				{tube = {can_go = function(pos, node, velocity, stack)
@@ -266,6 +285,7 @@ if pipeworks.enable_mese_tube then
 									 if st:get_name() == name then
 										 found = true
 										 table.insert(tbl, vect)
+										 break
 									 end
 								 end
 							 end
@@ -288,71 +308,37 @@ if pipeworks.enable_mese_tube then
 						 meta:set_int("l"..tostring(i).."s", 1)
 						 inv:set_size("line"..tostring(i), 6*1)
 					 end
-					 meta:set_string("formspec",
-							 "size[8,11]"..
-							 "list[current_name;line1;1,0;6,1;]"..
-							 "list[current_name;line2;1,1;6,1;]"..
-							 "list[current_name;line3;1,2;6,1;]"..
-							 "list[current_name;line4;1,3;6,1;]"..
-							 "list[current_name;line5;1,4;6,1;]"..
-							 "list[current_name;line6;1,5;6,1;]"..
-							 "image[0,0;1,1;pipeworks_white.png]"..
-							 "image[0,1;1,1;pipeworks_black.png]"..
-							 "image[0,2;1,1;pipeworks_green.png]"..
-							 "image[0,3;1,1;pipeworks_yellow.png]"..
-							 "image[0,4;1,1;pipeworks_blue.png]"..
-							 "image[0,5;1,1;pipeworks_red.png]"..
-							 "button[7,0;1,1;button10;On]"..
-							 "button[7,1;1,1;button20;On]"..
-							 "button[7,2;1,1;button30;On]"..
-							 "button[7,3;1,1;button40;On]"..
-							 "button[7,4;1,1;button50;On]"..
-							 "button[7,5;1,1;button60;On]"..
-							 "list[current_player;main;0,7;8,4;]")
-					 meta:set_string("infotext", "Sorting Pneumatic Tube Segment")
+				 	 update_formspec(pos)
+					 meta:set_string("infotext", "Mese pneumatic tube")
 				 end,
+				 on_punch = update_formspec,
 				 on_receive_fields = function(pos, formname, fields, sender)
-					 local meta = minetest.get_meta(pos)
-					 local i
-					 if fields.quit then return end
-					 for key, _ in pairs(fields) do
-						if key:sub(1, 6) == "button" then
-							local i = key:sub(7, 7)
-							local s = key:sub(8, 8)
-							if s == "" then s = 1 - meta:get_int("l"..i.."s") end
-							meta:set_int("l"..i.."s", s)
-						end
-					 end
-					 local frm = "size[8,11]"..
-						 "list[current_name;line1;1,0;6,1;]"..
-						 "list[current_name;line2;1,1;6,1;]"..
-						 "list[current_name;line3;1,2;6,1;]"..
-						 "list[current_name;line4;1,3;6,1;]"..
-						 "list[current_name;line5;1,4;6,1;]"..
-						 "list[current_name;line6;1,5;6,1;]"..
-						 "image[0,0;1,1;pipeworks_white.png]"..
-						 "image[0,1;1,1;pipeworks_black.png]"..
-						 "image[0,2;1,1;pipeworks_green.png]"..
-						 "image[0,3;1,1;pipeworks_yellow.png]"..
-						 "image[0,4;1,1;pipeworks_blue.png]"..
-						 "image[0,5;1,1;pipeworks_red.png]"
-					 for i = 1, 6 do
-						 local st = meta:get_int("l"..tostring(i).."s")
-						 if st == 0 then
-							 frm = frm.."button[7,"..tostring(i-1)..";1,1;button"..tostring(i).."1;Off]"
-						 else
-							 frm = frm.."button[7,"..tostring(i-1)..";1,1;button"..tostring(i).."0;On]"
-						 end
-					 end
-					 frm = frm.."list[current_player;main;0,7;8,4;]"
-					 meta:set_string("formspec", frm)
+					 fs_helpers.on_receive_fields(pos, fields)
+					 update_formspec(pos)
 				 end,
 				 can_dig = function(pos, player)
 					 local meta = minetest.get_meta(pos)
 					 local inv = meta:get_inventory()
 					 return (inv:is_empty("line1") and inv:is_empty("line2") and inv:is_empty("line3") and
 							 inv:is_empty("line4") and inv:is_empty("line5") and inv:is_empty("line6"))
-				 end
+				 end,
+				 allow_metadata_inventory_put = function(pos, listname, index, stack, player)
+				 	local inv = minetest.get_meta(pos):get_inventory()
+				 	local stack_copy = ItemStack(stack)
+				 	stack_copy:set_count(1)
+				 	inv:set_stack(listname, index, stack_copy)
+				 	return 0
+				 end,
+				 allow_metadata_inventory_take = function(pos, listname, index, stack, player)
+				 	local inv = minetest.get_meta(pos):get_inventory()
+				 	inv:set_stack(listname, index, ItemStack(""))
+				 	return 0
+				 end,
+				 allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
+				 	local inv = minetest.get_meta(pos):get_inventory()
+				 	inv:set_stack(from_list, from_index, ItemStack(""))
+				 	return 0
+				 end,
 				}, true) -- Must use old tubes, since the textures are rotated with 6d ones
 end
 
@@ -360,6 +346,7 @@ if pipeworks.enable_detector_tube then
 	local detector_plain_textures = {"pipeworks_detector_tube_plain.png", "pipeworks_detector_tube_plain.png", "pipeworks_detector_tube_plain.png",
 					 "pipeworks_detector_tube_plain.png", "pipeworks_detector_tube_plain.png", "pipeworks_detector_tube_plain.png"}
 	local detector_inv_texture = "pipeworks_detector_tube_inv.png"
+	local detector_tube_step = 2 * tonumber(minetest.setting_get("dedicated_server_step"))
 	pipeworks.register_tube("pipeworks:detector_tube_on", "Detecting Pneumatic Tube Segment on (you hacker you)", detector_plain_textures, noctr_textures,
 				end_textures, short_texture, detector_inv_texture,
 				{tube = {can_go = function(pos, node, velocity, stack)
@@ -367,12 +354,8 @@ if pipeworks.enable_detector_tube then
 						 local name = minetest.get_node(pos).name
 						 local nitems = meta:get_int("nitems")+1
 						 meta:set_int("nitems", nitems)
-						 local saved_pos = { x = pos.x, y = pos.y, z = pos.z }
-						 minetest.after(0, function ()
-						 minetest.after(0, function ()
-							minetest.after(0, minetest.registered_nodes[name].item_exit, saved_pos)
-						 end)
-						 end)
+						 local saved_pos = vector.new(pos)
+					 	 minetest.after(detector_tube_step, minetest.registered_nodes[name].item_exit, saved_pos)
 						 return pipeworks.notvel(pipeworks.meseadjlist,velocity)
 					end},
 				 groups = {mesecon = 2, not_in_creative_inventory = 1},
@@ -396,13 +379,11 @@ if pipeworks.enable_detector_tube then
 					 local meta = minetest.get_meta(pos)
 					 meta:set_int("nitems", 1)
 					 local name = minetest.get_node(pos).name
-					 local saved_pos = { x = pos.x, y = pos.y, z = pos.z }
-					 minetest.after(0, function ()
-					 minetest.after(0, function ()
-						minetest.after(0, minetest.registered_nodes[name].item_exit, saved_pos)
-					 end)
-					 end)
-	end})
+					 local saved_pos = vector.new(pos)
+					 minetest.after(detector_tube_step, minetest.registered_nodes[name].item_exit, saved_pos)
+				
+				end
+	})
 	pipeworks.register_tube("pipeworks:detector_tube_off", "Detecting Pneumatic Tube Segment", detector_plain_textures, noctr_textures,
 				end_textures, short_texture, detector_inv_texture,
 				{tube = {can_go = function(pos, node, velocity, stack)
@@ -474,7 +455,6 @@ if pipeworks.enable_accelerator_tube then
 end
 
 if pipeworks.enable_crossing_tube then
-	-- FIXME: The textures are not the correct ones
 	local crossing_noctr_textures = {"pipeworks_crossing_tube_noctr.png", "pipeworks_crossing_tube_noctr.png", "pipeworks_crossing_tube_noctr.png",
 					 "pipeworks_crossing_tube_noctr.png", "pipeworks_crossing_tube_noctr.png", "pipeworks_crossing_tube_noctr.png"}
 	local crossing_plain_textures = {"pipeworks_crossing_tube_plain.png" ,"pipeworks_crossing_tube_plain.png", "pipeworks_crossing_tube_plain.png",
@@ -513,10 +493,7 @@ if pipeworks.enable_sand_tube then
 				       for _, object in ipairs(minetest.get_objects_inside_radius(pos, 2)) do
 					       if not object:is_player() and object:get_luaentity() and object:get_luaentity().name == "__builtin:item" then
 						       if object:get_luaentity().itemstring ~= "" then
-							       local titem = pipeworks.tube_item(pos,object:get_luaentity().itemstring)
-							       titem:get_luaentity().start_pos = {x = pos.x, y = pos.y-1, z = pos.z}
-							       titem:setvelocity({x = 0.01, y = 1, z = -0.01})
-							       titem:setacceleration({x = 0, y = 0, z = 0})
+							       pipeworks.tube_item(pos, pos, vector.new(0, 0, 0), object:get_luaentity().itemstring)
 						       end
 						       object:get_luaentity().itemstring = ""
 						       object:remove()
@@ -576,10 +553,7 @@ if pipeworks.enable_mese_sand_tube then
 				       for _,object in ipairs(get_objects_with_square_radius(pos, minetest.env:get_meta(pos):get_int("dist"))) do
 					       if not object:is_player() and object:get_luaentity() and object:get_luaentity().name == "__builtin:item" then
 						       if object:get_luaentity().itemstring ~= "" then
-							       local titem = pipeworks.tube_item(pos, object:get_luaentity().itemstring)
-							       titem:get_luaentity().start_pos = {x = pos.x, y = pos.y-1, z = pos.z}
-							       titem:setvelocity({x = 0.01, y = 1, z = -0.01})
-							       titem:setacceleration({x = 0, y = 0, z = 0})
+							       pipeworks.tube_item(pos, pos, vector.new(0, 0, 0), object:get_luaentity().itemstring)
 						       end
 						       object:get_luaentity().itemstring = ""
 						       object:remove()
@@ -589,26 +563,9 @@ if pipeworks.enable_mese_sand_tube then
 	})
 end
 
-local function facedir_to_right_dir(facedir)
-	
-	--find the other directions
-	local backdir = minetest.facedir_to_dir(facedir)
-	local topdir = ({[0] = {x = 0, y = 1, z = 0},
-			 {x = 0, y = 0, z = 1},
-			 {x = 0, y = 0, z = -1},
-			 {x = 1, y = 0, z = 0},
-			 {x = -1, y = 0, z = 0},
-			 {x = 0, y = -1, z = 0}})[math.floor(facedir/4)]
-	
-	--return a cross product
-	return {x = topdir.y*backdir.z - backdir.y*topdir.z,
-		y = topdir.z*backdir.x - backdir.z*topdir.x,
-		z = topdir.x*backdir.y - backdir.x*topdir.y}
-end
-
 if pipeworks.enable_one_way_tube then
 	minetest.register_node("pipeworks:one_way_tube", {
-		description = "One-way Pneumatic Tube Segment",
+		description = "One way tube",
 		tiles = {"pipeworks_one_way_tube_top.png", "pipeworks_one_way_tube_top.png", "pipeworks_one_way_tube_output.png",
 			"pipeworks_one_way_tube_input.png", "pipeworks_one_way_tube_side.png", "pipeworks_one_way_tube_top.png"},
 		paramtype2 = "facedir",
@@ -616,35 +573,19 @@ if pipeworks.enable_one_way_tube then
 		paramtype = "light",
 		node_box = {type = "fixed",
 			fixed = {{-1/2, -9/64, -9/64, 1/2, 9/64, 9/64}}},
-		groups = {snappy = 2, choppy = 2, oddly_breakable_by_hand = 2, tubedevice = 1, tubedevice_receiver = 1},
+		groups = {snappy = 2, choppy = 2, oddly_breakable_by_hand = 2, tubedevice = 1},
 		legacy_facedir_simple = true,
 		sounds = default.node_sound_wood_defaults(),
-		on_construct = function(pos)
-			minetest.get_meta(pos):set_int("tubelike", 1)
-		end,
-		after_place_node = function(pos)
-			pipeworks.scan_for_tube_objects(pos)
-		end,
-		after_dig_node = function(pos)
-			pipeworks.scan_for_tube_objects(pos)
-		end,
-		tube = {connect_sides = {left = 1, right = 1},
+		tube = {
+			connect_sides = {left = 1, right = 1},
 			can_go = function(pos, node, velocity, stack)
-				return velocity
-			end,
-			insert_object = function(pos, node, stack, direction)
-				item1 = pipeworks.tube_item(pos, stack)
-				item1:get_luaentity().start_pos = pos
-				item1:setvelocity({x = direction.x*direction.speed, y = direction.y*direction.speed, z = direction.z*direction.speed})
-				item1:setacceleration({x = 0, y = 0, z = 0})
-				return ItemStack("")
+				return {velocity}
 			end,
 			can_insert = function(pos, node, stack, direction)
-				local dir = facedir_to_right_dir(node.param2)
-				if dir.x == direction.x and dir.y == direction.y and dir.z == direction.z then
-					return true
-				end
-				return false
-			end},
+				local dir = minetest.facedir_to_right_dir(node.param2)
+				return vector.equals(dir, direction)
+			end,
+			priority = 75 -- Higher than normal tubes, but lower than receivers
+		},
 	})
 end
-- 
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