diff --git a/nether/common.lua b/nether/common.lua
new file mode 100644
index 0000000..0ec5eb3
--- /dev/null
+++ b/nether/common.lua
@@ -0,0 +1,153 @@
+
+dofile(nether.path .. "/settings.lua")
+
+-- vars
+nether.v = {}
+local v = nether.v
+
+--== EDITABLE OPTIONS ==--
+
+-- Depth of the nether
+v.nether_middle = -20000
+
+-- forest bottom perlin multiplication
+v.f_bottom_scale = 4
+
+-- forest bottom height
+v.f_h_min = v.nether_middle+10
+
+-- forest top height
+v.f_h_max = v.f_h_min+250
+
+-- Frequency of trees in the nether forest (higher is less frequent)
+v.tree_rarity = 200
+
+-- Frequency of glowflowers in the nether forest (higher is less frequent)
+v.glowflower_rarity = 120
+
+-- Frequency of nether grass in the nether forest (higher is less frequent)
+v.grass_rarity = 2
+
+-- Frequency of nether mushrooms in the nether forest (higher is less frequent)
+v.mushroom_rarity = 80
+
+v.abm_tree_interval = 864
+v.abm_tree_chance = 100
+
+-- height of the nether generation's end
+v.nether_start = v.f_h_max+100
+
+-- Height of the nether (bottom of the nether is nether_middle - NETHER_HEIGHT)
+v.NETHER_HEIGHT = 30
+
+-- bottom height of the nether.
+v.nether_bottom = v.nether_middle - v.NETHER_HEIGHT - 100
+
+-- Maximum amount of randomness in the map generation
+v.NETHER_RANDOM = 2
+
+-- Frequency of Glowstone on the "roof" of the Nether (higher is less frequent)
+v.GLOWSTONE_FREQ_ROOF = 500
+
+-- Frequency of lava (higher is less frequent)
+v.LAVA_FREQ = 100
+
+v.nether_structure_freq = 350
+v.NETHER_SHROOM_FREQ = 100
+
+-- Maximum height of lava
+--v.LAVA_HEIGHT = 2
+-- Frequency of Glowstone on lava (higher is less frequent)
+--v.GLOWSTONE_FREQ_LAVA = 2
+-- Height of nether structures
+--v.NETHER_TREESIZE = 2
+-- Frequency of apples in a nether structure (higher is less frequent)
+--v.NETHER_APPLE_FREQ = 5
+-- Frequency of healing apples in a nether structure (higher is less frequent)
+--v.NETHER_HEAL_APPLE_FREQ = 10
+-- Start position for the Throne of Hades (y is relative to the bottom of the
+-- nether)
+--v.HADES_THRONE_STARTPOS = {x=0, y=1, z=0}
+-- Spawn pos for when the nether hasn't been loaded yet (i.e. no portal in the
+-- nether) (y is relative to the bottom of the nether)
+--v.NETHER_SPAWNPOS = {x=0, y=5, z=0}
+-- Structure of the nether portal (all is relative to the nether portal creator
+-- block)
+
+--== END OF EDITABLE OPTIONS ==--
+
+-- Generated variables
+v.NETHER_BOTTOM = (v.nether_middle - v.NETHER_HEIGHT)
+v.nether_buildings = v.NETHER_BOTTOM+12
+
+function nether.query_contents()
+	local c = {
+		ignore = minetest.get_content_id("ignore"),
+		air = minetest.get_content_id("air"),
+		lava = minetest.get_content_id("default:lava_source"),
+		gravel = minetest.get_content_id("default:gravel"),
+		coal = minetest.get_content_id("default:stone_with_coal"),
+		diamond = minetest.get_content_id("default:stone_with_diamond"),
+		mese = minetest.get_content_id("default:mese"),
+
+		--https://github.com/Zeg9/minetest-glow
+		glowstone = minetest.get_content_id("glow:stone"),
+
+		nether_shroom = minetest.get_content_id("riesenpilz:nether_shroom"),
+
+		netherrack = minetest.get_content_id("nether:netherrack"),
+		netherrack_tiled = minetest.get_content_id("nether:netherrack_tiled"),
+		netherrack_black = minetest.get_content_id("nether:netherrack_black"),
+		netherrack_blue = minetest.get_content_id("nether:netherrack_blue"),
+		netherrack_brick = minetest.get_content_id("nether:netherrack_brick"),
+		white = minetest.get_content_id("nether:white"),
+
+		nether_vine = minetest.get_content_id("nether:vine"),
+		blood = minetest.get_content_id("nether:blood"),
+		blood_top = minetest.get_content_id("nether:blood_top"),
+		blood_stem = minetest.get_content_id("nether:blood_stem"),
+		nether_apple = minetest.get_content_id("nether:apple"),
+
+		nether_tree = minetest.get_content_id("nether:tree"),
+		nether_tree_corner = minetest.get_content_id("nether:tree_corner"),
+		nether_leaves = minetest.get_content_id("nether:leaves"),
+		nether_grass = {
+			minetest.get_content_id("nether:grass_small"),
+			minetest.get_content_id("nether:grass_middle"),
+			minetest.get_content_id("nether:grass_big")
+		},
+		glowflower = minetest.get_content_id("nether:glowflower"),
+		nether_dirt = minetest.get_content_id("nether:dirt"),
+		nether_dirt_top = minetest.get_content_id("nether:dirt_top"),
+		nether_dirt_bottom = minetest.get_content_id("nether:dirt_bottom"),
+	}
+	local trn = {c.nether_tree, c.nether_tree_corner, c.nether_leaves,
+		c.nether_fruit}
+	local nether_tree_nodes = {}
+	for i = 1,#trn do
+		nether_tree_nodes[trn[i]] = true
+	end
+
+	return c, nether_tree_nodes
+end
+
+if nether.log_level >= 1 then
+	function nether:inform(msg, spam, t)
+		if spam <= self.log_level then
+			local info
+			if t then
+				info = "[nether] " .. msg .. (" after ca. %.3g s"):format(
+					(minetest.get_us_time() - t) / 1000000)
+			else
+				info = "[nether] " .. msg
+			end
+			print(info)
+			if self.log_to_chat then
+				minetest.chat_send_all(info)
+			end
+		end
+	end
+else
+	function nether.inform()
+	end
+end
diff --git a/nether/guide.lua b/nether/guide.lua
index 8183ba2..c550588 100644
--- a/nether/guide.lua
+++ b/nether/guide.lua
@@ -263,7 +263,7 @@ minetest.register_chatcommand("nether_help", {
 		if not player then
 			return false, "Something went wrong."
 		end
-		if not nether.overworld_help and player:get_pos().y > nether.start then
+		if not nether.overworld_help and player:get_pos().y > nether.v.nether_start then
 			return false, "Usually you don't neet this guide here. " ..
 				"You can view it in the nether."
 		end
diff --git a/nether/init.lua b/nether/init.lua
index 0e78bb1..c02f39a 100644
--- a/nether/init.lua
+++ b/nether/init.lua
@@ -17,145 +17,16 @@ if not rawget(_G, "nether") then
 	nether = {}
 end
 
---== EDITABLE OPTIONS ==--
+nether.path = minetest.get_modpath"nether"
+local path = nether.path
 
--- Depth of the nether
-local nether_middle = -20000
+dofile(path .. "/common.lua")
 
--- forest bottom perlin multiplication
-local f_bottom_scale = 4
-
--- forest bottom height
-local f_h_min = nether_middle+10
-
--- forest top height
-local f_h_max = f_h_min+250
-
--- Frequency of trees in the nether forest (higher is less frequent)
-local tree_rarity = 200
-
--- Frequency of glowflowers in the nether forest (higher is less frequent)
-local glowflower_rarity = 120
-
--- Frequency of nether grass in the nether forest (higher is less frequent)
-local grass_rarity = 2
-
--- Frequency of nether mushrooms in the nether forest (higher is less frequent)
-local mushroom_rarity = 80
-
-local abm_tree_interval = 864
-local abm_tree_chance = 100
-
--- height of the nether generation's end
-nether.start = f_h_max+100
-
--- Height of the nether (bottom of the nether is nether_middle - NETHER_HEIGHT)
-local NETHER_HEIGHT = 30
-
--- bottom height of the nether.
-nether.bottom = nether_middle - NETHER_HEIGHT - 100
-
--- Maximum amount of randomness in the map generation
-local NETHER_RANDOM = 2
-
--- Frequency of Glowstone on the "roof" of the Nether (higher is less frequent)
-local GLOWSTONE_FREQ_ROOF = 500
-
--- Frequency of lava (higher is less frequent)
-local LAVA_FREQ = 100
-
-local nether_structure_freq = 350
-local NETHER_SHROOM_FREQ = 100
-
--- Maximum height of lava
---LAVA_HEIGHT = 2
--- Frequency of Glowstone on lava (higher is less frequent)
---GLOWSTONE_FREQ_LAVA = 2
--- Height of nether structures
---NETHER_TREESIZE = 2
--- Frequency of apples in a nether structure (higher is less frequent)
---NETHER_APPLE_FREQ = 5
--- Frequency of healing apples in a nether structure (higher is less frequent)
---NETHER_HEAL_APPLE_FREQ = 10
--- Start position for the Throne of Hades (y is relative to the bottom of the
--- nether)
---HADES_THRONE_STARTPOS = {x=0, y=1, z=0}
--- Spawn pos for when the nether hasn't been loaded yet (i.e. no portal in the
--- nether) (y is relative to the bottom of the nether)
---NETHER_SPAWNPOS = {x=0, y=5, z=0}
--- Structure of the nether portal (all is relative to the nether portal creator
--- block)
-
---== END OF EDITABLE OPTIONS ==--
-
-local path = minetest.get_modpath"nether"
-dofile(path .. "/settings.lua")
-local nether_weird_noise = dofile(path .. "/weird_mapgen_noise.lua")
 dofile(path .. "/items.lua")
 --dofile(path .. "/furnace.lua")
 dofile(path .. "/pearl.lua")
 
 
-if nether.log_level >= 1 then
-	function nether:inform(msg, spam, t)
-		if spam <= self.log_level then
-			local info
-			if t then
-				info = "[nether] " .. msg .. (" after ca. %.3g s"):format(
-					(minetest.get_us_time() - t) / 1000000)
-			else
-				info = "[nether] " .. msg
-			end
-			print(info)
-			if self.log_to_chat then
-				minetest.chat_send_all(info)
-			end
-		end
-	end
-else
-	function nether.inform()
-	end
-end
-
-
--- Weierstrass function stuff from https://github.com/slemonide/gen
-local SIZE = 1000
-local ssize = math.ceil(math.abs(SIZE))
-local function do_ws_func(depth, a, x)
-	local n = math.pi * x / (16 * SIZE)
-	local y = 0
-	for k=1,depth do
-		y = y + math.sin(k^a * n) / k^a
-	end
-	return SIZE * y / math.pi
-end
-
-local chunksize = minetest.settings:get"chunksize" or 5
-local ws_lists = {}
-local function get_ws_list(a,x)
-        ws_lists[a] = ws_lists[a] or {}
-        local v = ws_lists[a][x]
-        if v then
-                return v
-        end
-        v = {}
-        for x=x,x + (chunksize*16 - 1) do
-		local y = do_ws_func(ssize, a, x)
-                v[x] = y
-        end
-        ws_lists[a][x] = v
-        return v
-end
-
-
-local function dif(z1, z2)
-	return math.abs(z1-z2)
-end
-
-local function pymg(x1, x2, z1, z2)
-	return math.max(dif(x1, x2), dif(z1, z2))
-end
-
 local function r_area(manip, width, height, pos)
 	local emerged_pos1, emerged_pos2 = manip:read_from_map(
 		{x=pos.x-width, y=pos.y, z=pos.z-width},
@@ -171,477 +42,20 @@ local function set_vm_data(manip, nodes, pos, t1, name, generated)
 		generated and 3 or 2, t1)
 end
 
--- Generated variables
-local NETHER_BOTTOM = (nether_middle - NETHER_HEIGHT)
-nether.buildings = NETHER_BOTTOM+12
---~ local NETHER_ROOF_ABS = (nether_middle - NETHER_RANDOM)
-local f_yscale_top = (f_h_max-f_h_min)/2
-local f_yscale_bottom = f_yscale_top/2
---HADES_THRONE_STARTPOS_ABS = {x=HADES_THRONE_STARTPOS.x, y=(NETHER_BOTTOM +
---HADES_THRONE_STARTPOS.y), z=HADES_THRONE_STARTPOS.z}
---LAVA_Y = (NETHER_BOTTOM + LAVA_HEIGHT)
---HADES_THRONE_ABS = {}
---HADES_THRONE_ENDPOS_ABS = {}
---HADES_THRONE_GENERATED = minetest.get_worldpath() .. "/netherhadesthrone.txt"
---NETHER_SPAWNPOS_ABS = {x=NETHER_SPAWNPOS.x, y=(NETHER_BOTTOM +
---NETHER_SPAWNPOS.y), z=NETHER_SPAWNPOS.z}
---[[for i,v in ipairs(HADES_THRONE) do
-	v.pos.x = v.pos.x + HADES_THRONE_STARTPOS_ABS.x
-	v.pos.y = v.pos.y + HADES_THRONE_STARTPOS_ABS.y
-	v.pos.z = v.pos.z + HADES_THRONE_STARTPOS_ABS.z
-	HADES_THRONE_ABS[i] = v
-end
-local htx = 0
-local hty = 0
-local htz = 0
-for i,v in ipairs(HADES_THRONE_ABS) do
-	if v.pos.x > htx then
-		htx = v.pos.x
-	end
-	if v.pos.y > hty then
-		hty = v.pos.y
-	end
-	if v.pos.z > htz then
-		htz = v.pos.z
-	end
-end
-HADES_THRONE_ENDPOS_ABS = {x=htx, y=hty, z=htz}]]
-
-local c, nether_tree_nodes
+local c, contents_defined
 local function define_contents()
-	c = {
-		ignore = minetest.get_content_id("ignore"),
-		air = minetest.get_content_id("air"),
-		lava = minetest.get_content_id("default:lava_source"),
-		gravel = minetest.get_content_id("default:gravel"),
-		coal = minetest.get_content_id("default:stone_with_coal"),
-		diamond = minetest.get_content_id("default:stone_with_diamond"),
-		mese = minetest.get_content_id("default:mese"),
-
-		--https://github.com/Zeg9/minetest-glow
-		glowstone = minetest.get_content_id("glow:stone"),
-
-		nether_shroom = minetest.get_content_id("riesenpilz:nether_shroom"),
-
-		netherrack = minetest.get_content_id("nether:netherrack"),
-		netherrack_tiled = minetest.get_content_id("nether:netherrack_tiled"),
-		netherrack_black = minetest.get_content_id("nether:netherrack_black"),
-		netherrack_blue = minetest.get_content_id("nether:netherrack_blue"),
-		netherrack_brick = minetest.get_content_id("nether:netherrack_brick"),
-		white = minetest.get_content_id("nether:white"),
-
-		nether_vine = minetest.get_content_id("nether:vine"),
-		blood = minetest.get_content_id("nether:blood"),
-		blood_top = minetest.get_content_id("nether:blood_top"),
-		blood_stem = minetest.get_content_id("nether:blood_stem"),
-		nether_apple = minetest.get_content_id("nether:apple"),
-
-		nether_tree = minetest.get_content_id("nether:tree"),
-		nether_tree_corner = minetest.get_content_id("nether:tree_corner"),
-		nether_leaves = minetest.get_content_id("nether:leaves"),
-		nether_grass = {
-			minetest.get_content_id("nether:grass_small"),
-			minetest.get_content_id("nether:grass_middle"),
-			minetest.get_content_id("nether:grass_big")
-		},
-		glowflower = minetest.get_content_id("nether:glowflower"),
-		nether_dirt = minetest.get_content_id("nether:dirt"),
-		nether_dirt_top = minetest.get_content_id("nether:dirt_top"),
-		nether_dirt_bottom = minetest.get_content_id("nether:dirt_bottom"),
-	}
-	local trn = {c.nether_tree, c.nether_tree_corner, c.nether_leaves,
-		c.nether_fruit}
-	nether_tree_nodes = {}
-	for i = 1,#trn do
-		nether_tree_nodes[trn[i]] = true
-	end
-end
-
-local pr, contents_defined
-
-local function return_nether_ore(id, glowstone)
-	if glowstone
-	and pr:next(0,GLOWSTONE_FREQ_ROOF) == 1 then
-		return c.glowstone
-	end
-	if id == c.coal then
-		return c.netherrack_tiled
-	end
-	if id == c.gravel then
-		return c.netherrack_black
-	end
-	if id == c.diamond then
-		return c.netherrack_blue
-	end
-	if id == c.mese then
-		return c.white
-	end
-	return c.netherrack
-end
-
-local f_perlins = {}
-
--- abs(v) < 1-(persistance^octaves))/(1-persistance) = amp
---local perlin1 = minetest.get_perlin(13,3, 0.5, 50) --Get map specific perlin
---	local perlin2 = minetest.get_perlin(133,3, 0.5, 10)
---	local perlin3 = minetest.get_perlin(112,3, 0.5, 5)
-local tmp = f_yscale_top*4
-local tmp2 = tmp/f_bottom_scale
-local perlins = {
-	{ -- amp 1.75
-		seed = 13,
-		octaves = 3,
-		persist = 0.5,
-		spread = {x=50, y=50, z=50},
-		scale = 1,
-		offset = 0,
-	},
-	{-- amp 1.75
-		seed = 133,
-		octaves = 3,
-		persist = 0.5,
-		spread = {x=10, y=10, z=10},
-		scale = 1,
-		offset = 0,
-	},
-	{-- amp 1.75
-		seed = 112,
-		octaves = 3,
-		persist = 0.5,
-		spread = {x=5, y=5, z=5},
-		scale = 1,
-		offset = 0,
-	},
-	--[[forest_bottom = {
-		seed = 11,
-		octaves = 3,
-		persist = 0.8,
-		spread = {x=tmp2, y=tmp2, z=tmp2},
-		scale = 1,
-		offset = 0,
-	},]]
-	forest_top = {-- amp 2.44
-		seed = 21,
-		octaves = 3,
-		persist = 0.8,
-		spread = {x=tmp, y=tmp, z=tmp},
-		scale = 1,
-		offset = 0,
-	},
-}
-
--- buffers, see https://forum.minetest.net/viewtopic.php?f=18&t=16043
-local pelin_maps
-local pmap1 = {}
-local pmap2 = {}
-local pmap3 = {}
-local pmap_f_top = {}
-local data = {}
-
-local structures_enabled = true
-local vine_maxlength = math.floor(NETHER_HEIGHT/4+0.5)
--- Create the Nether
-minetest.register_on_generated(function(minp, maxp, seed)
-	--avoid big map generation
-	if not (maxp.y >= NETHER_BOTTOM-100 and minp.y <= nether.start) then
-		return
-	end
-
-	local t1 = minetest.get_us_time()
-	nether:inform("generates at: x=["..minp.x.."; "..maxp.x.."]; y=[" ..
-		minp.y.."; "..maxp.y.."]; z=["..minp.z.."; "..maxp.z.."]", 2)
-
 	if not contents_defined then
-		define_contents()
+		c = nether.query_contents()
 		contents_defined = true
 	end
+end
 
-	local buildings = 0
-	if maxp.y <= NETHER_BOTTOM then
-		buildings = 1
-	elseif minp.y <= nether.buildings then
-		buildings = 2
-	end
-
-	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
-	vm:get_data(data)
-	local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
-
-	pr = PseudoRandom(seed+33)
-	local tab,num = {},1
-	local trees,num_trees = {},1
-
-	--local perlin1 = minetest.get_perlin(13,3, 0.5, 50)
-	--local perlin2 = minetest.get_perlin(133,3, 0.5, 10)
-	--local perlin3 = minetest.get_perlin(112,3, 0.5, 5)
-
-	local side_length = maxp.x - minp.x + 1
-	local map_lengths_xyz = {x=side_length, y=side_length, z=side_length}
-
-	if not pelin_maps then
-		pelin_maps = {
-			a = minetest.get_perlin_map(perlins[1], map_lengths_xyz),
-			b = minetest.get_perlin_map(perlins[2], map_lengths_xyz),
-			c = minetest.get_perlin_map(perlins[3], map_lengths_xyz),
-			forest_top = minetest.get_perlin_map(perlins.forest_top,
-				map_lengths_xyz),
-		}
-	end
-	pelin_maps.a:get_2d_map_flat({x=minp.x, y=minp.z}, pmap1)
-	pelin_maps.b:get_2d_map_flat({x=minp.x, y=minp.z}, pmap2)
-	pelin_maps.c:get_2d_map_flat({x=minp.x, y=minp.z}, pmap3)
-
-	local forest_possible = maxp.y > f_h_min and minp.y < f_h_max
-
-	--local pmap_f_bottom = minetest.get_perlin_map(perlins.forest_bottom,
-	-- map_lengths_xyz):get_2d_map_flat({x=minp.x, y=minp.z})
-	local perlin_f_bottom, strassx, strassz
-	if forest_possible then
-		perlin_f_bottom = minetest.get_perlin(11, 3, 0.8, tmp2)
-		pelin_maps.forest_top:get_2d_map_flat({x=minp.x, y=minp.z}, pmap_f_top)
-		strassx = get_ws_list(2, minp.x)
-		strassz = get_ws_list(2, minp.z)
-	end
-
-	local num2, tab2
-	if buildings >= 1 then
-		num2 = 1
-		tab2 = nether_weird_noise({x=minp.x, y=nether.buildings-79, z=minp.z},
-			pymg, 200, 8, 10, side_length-1)
-	end
-
-	local count = 0
-	for z=minp.z, maxp.z do
-		for x=minp.x, maxp.x do
-
-			count = count+1
-
-			local test = pmap1[count]+1
-			local test2 = pmap2[count]
-			local test3 = math.abs(pmap3[count])
-
-			local t = math.floor(test*3+0.5)
-
-			local h
-			if test2 < 0 then
-				h = math.floor(test2*3+0.5)-1
-			else
-				h = 3+t+pr:next(0,NETHER_RANDOM)
-			end
-
-			local generate_vine = false
-			if test3 >= 0.72+pr:next(0,NETHER_RANDOM)/10
-			and pr:next(0,NETHER_RANDOM) == 1 then
-				generate_vine = true
-			end
-
-			local bottom = NETHER_BOTTOM+h
-			local top = nether_middle-pr:next(0,NETHER_RANDOM)+t
-
-			local py_h = 0
-			local difn, noisp, py_h_g
-			if buildings >= 1 then
-				py_h = tab2[num2].y
-				num2 = num2+1
-
-				difn = nether.buildings-py_h
-				if difn == 5 then
-					noisp = 1
-				elseif difn < 5 then
-					noisp = 2
-				end
-				py_h_g = nether.buildings-7
-			end
-
-			local vi = area:index(x, minp.y, z)
-			if buildings == 1
-			and noisp then
-				if noisp == 1 then
-					for _ = 1,side_length do
-						data[vi] = c.netherrack_brick
-						vi = vi + area.ystride
-					end
-				else
-					for _ = 1,side_length do
-						data[vi] = c.lava
-						vi = vi + area.ystride
-					end
-				end
-			else
-
-				local r_structure = pr:next(1,nether_structure_freq)
-				local r_shroom = pr:next(1,NETHER_SHROOM_FREQ)
-				local r_glowstone = pr:next(0,GLOWSTONE_FREQ_ROOF)
-				local r_vine_length = pr:next(1,vine_maxlength)
-
-				local f_bottom, f_top, is_forest, f_h_dirt
-				if forest_possible then
-					local p = {x=math.floor(x/f_bottom_scale),
-						z=math.floor(z/f_bottom_scale)}
-					local pstr = p.x.." "..p.z
-					if not f_perlins[pstr] then
-						f_perlins[pstr] = math.floor(f_h_min + (math.abs(
-							perlin_f_bottom:get_2d{x=p.x, y=p.z} + 1))
-							* f_yscale_bottom + 0.5)
-					end
-					local top_noise = pmap_f_top[count]+1
-					if top_noise < 0 then
-						top_noise = -top_noise/10
-						--nether:inform("ERROR: (perlin noise) "..
-						-- pmap_f_top[count].." is not inside [-1; 1]", 1)
-					end
-					f_top = math.floor(f_h_max - top_noise*f_yscale_top + 0.5)
-					f_bottom = f_perlins[pstr]+pr:next(0,f_bottom_scale-1)
-					is_forest = f_bottom < f_top
-					f_h_dirt = f_bottom-pr:next(0,1)
-				end
-
-				for y=minp.y, maxp.y do
-					local d_p_addp = data[vi]
-					--if py_h >= maxp.y-4 then
-					if y <= py_h
-					and noisp then
-						if noisp == 1 then
-							data[vi] = c.netherrack_brick
-						elseif noisp == 2 then
-							if y == py_h then
-								data[vi] = c.netherrack_brick
-							elseif y == py_h_g
-							and pr:next(1,3) <= 2 then
-								data[vi] = c.netherrack
-							elseif y <= py_h_g then
-								data[vi] = c.lava
-							else
-								data[vi] = c.air
-							end
-						end
-					elseif d_p_addp ~= c.air then
-
-						if is_forest
-						and y == f_bottom then
-							data[vi] = c.nether_dirt_top
-						elseif is_forest
-						and y < f_bottom
-						and y >= f_h_dirt then
-							data[vi] = c.nether_dirt
-						elseif is_forest
-						and y == f_h_dirt-1 then
-							data[vi] = c.nether_dirt_bottom
-						elseif is_forest
-						and y == f_h_dirt+1 then
-							if pr:next(1,tree_rarity) == 1 then
-								trees[num_trees] = {x=x, y=y, z=z}
-								num_trees = num_trees+1
-							elseif pr:next(1,mushroom_rarity) == 1 then
-								data[vi] = c.nether_shroom
-							elseif pr:next(1,glowflower_rarity) == 1 then
-								data[vi] = c.glowflower
-							elseif pr:next(1,grass_rarity) == 1 then
-								data[vi] = c.nether_grass[pr:next(1,3)]
-							else
-								data[vi] = c.air
-							end
-						elseif is_forest
-						and y > f_bottom
-						and y < f_top then
-							if not nether_tree_nodes[d_p_addp] then
-								data[vi] = c.air
-							end
-						elseif is_forest
-						and y == f_top then
-							local sel = math.floor(strassx[x]+strassz[z]+0.5)%10
-							if sel <= 5 then
-								data[vi] = return_nether_ore(d_p_addp, true)
-							elseif sel == 6 then
-								data[vi] = c.netherrack_black
-							elseif sel == 7 then
-								data[vi] = c.glowstone
-							else
-								data[vi] = c.air
-							end
-
-						elseif y <= NETHER_BOTTOM then
-							if y <= bottom then
-								data[vi] = return_nether_ore(d_p_addp, true)
-							else
-								data[vi] = c.lava
-							end
-						elseif r_structure == 1
-						and y == bottom then
-							tab[num] = {x=x, y=y-1, z=z}
-							num = num+1
-						elseif y <= bottom then
-							if pr:next(1,LAVA_FREQ) == 1 then
-								data[vi] = c.lava
-							else
-								data[vi] = return_nether_ore(d_p_addp, false)
-							end
-						elseif r_shroom == 1
-						and r_structure ~= 1
-						and y == bottom+1 then
-							data[vi] = c.nether_shroom
-						elseif (y == top and r_glowstone == 1) then
-							data[vi] = c.glowstone
-						elseif y >= top then
-							data[vi] = return_nether_ore(d_p_addp, true)
-						elseif y <= top-1
-						and generate_vine
-						and y >= top-r_vine_length then
-							data[vi] = c.nether_vine
-						else
-							data[vi] = c.air
-						end
-					end
-					vi = vi + area.ystride
-				end
-			end
-		end
-	end
-	vm:set_data(data)
---	vm:set_lighting(12)
---	vm:calc_lighting()
---	vm:update_liquids()
-	vm:write_to_map(false)
-
-	nether:inform("nodes set", 2, t1)
-
-	local t2 = minetest.get_us_time()
-	local tr_bl_cnt = 0
-
-	if structures_enabled then -- Blood netherstructures
-		tr_bl_cnt = #tab
-		for i = 1,tr_bl_cnt do
-			nether.grow_netherstructure(tab[i], true)
-		end
-	end
-
-	if forest_possible then -- Forest trees
-		tr_bl_cnt = tr_bl_cnt + #trees
-		for i = 1,#trees do
-			nether.grow_tree(trees[i], true)
-		end
-	end
-
-	if tr_bl_cnt > 0 then
-		nether:inform(tr_bl_cnt .. " trees and blood structures set", 2, t2)
-	end
-
-	t2 = minetest.get_us_time()
-	minetest.fix_light(minp, maxp)
-
-	nether:inform("light fixed", 2, t2)
-
-	nether:inform("done", 1, t1)
-end)
-
+dofile(path .. "/mapgen.lua")
 
 function nether.grow_netherstructure(pos, generated)
 	local t1 = minetest.get_us_time()
 
-	if not contents_defined then
-		define_contents()
-		contents_defined = true
-	end
+	define_contents()
 
 	if not pos.x then print(dump(pos))
 		nether:inform("Error: "..dump(pos), 1)
@@ -736,10 +150,7 @@ local h_trunk_max = h_max-h_arm_max
 function nether.grow_tree(pos, generated)
 	local t1 = minetest.get_us_time()
 
-	if not contents_defined then
-		define_contents()
-		contents_defined = true
-	end
+	define_contents()
 
 	local min = vector.new(pos)
 	local max = vector.new(pos)
@@ -926,8 +337,8 @@ minetest.register_abm({
 minetest.register_abm({
 	nodenames = {"nether:tree_sapling"},
 	neighbors = {"group:nether_dirt"},
-	interval = abm_tree_interval,
-	chance = abm_tree_chance,
+	interval = nether.v.abm_tree_interval,
+	chance = nether.v.abm_tree_chance,
 	action = function(pos)
 		if minetest.get_node({x=pos.x, y=pos.y+2, z=pos.z}).name == "air"
 		and minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z}).name == "air" then
diff --git a/nether/mapgen.lua b/nether/mapgen.lua
new file mode 100644
index 0000000..96dbcc2
--- /dev/null
+++ b/nether/mapgen.lua
@@ -0,0 +1,480 @@
+
+local path = nether.path
+
+-- vars
+local v = nether.v
+local nether_middle = v.nether_middle
+local f_bottom_scale = v.f_bottom_scale
+local f_h_min = v.f_h_min
+local f_h_max = v.f_h_max
+local tree_rarity = v.tree_rarity
+local glowflower_rarity = v.glowflower_rarity
+local grass_rarity = v.grass_rarity
+local mushroom_rarity = v.mushroom_rarity
+local nether_start = v.nether_start
+local NETHER_HEIGHT = v.NETHER_HEIGHT
+local NETHER_RANDOM = v.NETHER_RANDOM
+local GLOWSTONE_FREQ_ROOF = v.GLOWSTONE_FREQ_ROOF
+local LAVA_FREQ = v.LAVA_FREQ
+local nether_structure_freq = v.nether_structure_freq
+local NETHER_SHROOM_FREQ = v.NETHER_SHROOM_FREQ
+local NETHER_BOTTOM = v.NETHER_BOTTOM
+local nether_buildings = v.nether_buildings
+
+local nether_weird_noise = dofile(path .. "/weird_mapgen_noise.lua")
+
+-- Weierstrass function stuff from https://github.com/slemonide/gen
+local get_ws_list
+do
+	local SIZE = 1000
+	local ssize = math.ceil(math.abs(SIZE))
+	local function do_ws_func(depth, a, x)
+		local n = math.pi * x / (16 * SIZE)
+		local y = 0
+		for k=1,depth do
+			y = y + math.sin(k^a * n) / k^a
+		end
+		return SIZE * y / math.pi
+	end
+
+	local chunksize = minetest.settings:get"chunksize" or 5
+	local ws_lists = {}
+	get_ws_list = function(a,x)
+			ws_lists[a] = ws_lists[a] or {}
+			local v = ws_lists[a][x]
+			if v then
+					return v
+			end
+			v = {}
+			for x=x,x + (chunksize*16 - 1) do
+			local y = do_ws_func(ssize, a, x)
+					v[x] = y
+			end
+			ws_lists[a][x] = v
+			return v
+	end
+end
+
+local function dif(z1, z2)
+	return math.abs(z1-z2)
+end
+
+local function pymg(x1, x2, z1, z2)
+	return math.max(dif(x1, x2), dif(z1, z2))
+end
+
+-- Generated variables
+--~ local NETHER_ROOF_ABS = (nether_middle - NETHER_RANDOM)
+local f_yscale_top = (f_h_max-f_h_min)/2
+local f_yscale_bottom = f_yscale_top/2
+--HADES_THRONE_STARTPOS_ABS = {x=HADES_THRONE_STARTPOS.x, y=(NETHER_BOTTOM +
+--HADES_THRONE_STARTPOS.y), z=HADES_THRONE_STARTPOS.z}
+--LAVA_Y = (NETHER_BOTTOM + LAVA_HEIGHT)
+--HADES_THRONE_ABS = {}
+--HADES_THRONE_ENDPOS_ABS = {}
+--HADES_THRONE_GENERATED = minetest.get_worldpath() .. "/netherhadesthrone.txt"
+--NETHER_SPAWNPOS_ABS = {x=NETHER_SPAWNPOS.x, y=(NETHER_BOTTOM +
+--NETHER_SPAWNPOS.y), z=NETHER_SPAWNPOS.z}
+--[[for i,v in ipairs(HADES_THRONE) do
+	v.pos.x = v.pos.x + HADES_THRONE_STARTPOS_ABS.x
+	v.pos.y = v.pos.y + HADES_THRONE_STARTPOS_ABS.y
+	v.pos.z = v.pos.z + HADES_THRONE_STARTPOS_ABS.z
+	HADES_THRONE_ABS[i] = v
+end
+local htx = 0
+local hty = 0
+local htz = 0
+for i,v in ipairs(HADES_THRONE_ABS) do
+	if v.pos.x > htx then
+		htx = v.pos.x
+	end
+	if v.pos.y > hty then
+		hty = v.pos.y
+	end
+	if v.pos.z > htz then
+		htz = v.pos.z
+	end
+end
+HADES_THRONE_ENDPOS_ABS = {x=htx, y=hty, z=htz}]]
+
+local c, nether_tree_nodes, contents_defined
+local function define_contents()
+	if not contents_defined then
+		c, nether_tree_nodes = nether.query_contents()
+		contents_defined = true
+	end
+end
+
+local pr
+
+local function return_nether_ore(id, glowstone)
+	if glowstone
+	and pr:next(0,GLOWSTONE_FREQ_ROOF) == 1 then
+		return c.glowstone
+	end
+	if id == c.coal then
+		return c.netherrack_tiled
+	end
+	if id == c.gravel then
+		return c.netherrack_black
+	end
+	if id == c.diamond then
+		return c.netherrack_blue
+	end
+	if id == c.mese then
+		return c.white
+	end
+	return c.netherrack
+end
+
+local f_perlins = {}
+
+-- abs(v) < 1-(persistance^octaves))/(1-persistance) = amp
+--local perlin1 = minetest.get_perlin(13,3, 0.5, 50) --Get map specific perlin
+--	local perlin2 = minetest.get_perlin(133,3, 0.5, 10)
+--	local perlin3 = minetest.get_perlin(112,3, 0.5, 5)
+local tmp = f_yscale_top*4
+local tmp2 = tmp/f_bottom_scale
+local perlins = {
+	{ -- amp 1.75
+		seed = 13,
+		octaves = 3,
+		persist = 0.5,
+		spread = {x=50, y=50, z=50},
+		scale = 1,
+		offset = 0,
+	},
+	{-- amp 1.75
+		seed = 133,
+		octaves = 3,
+		persist = 0.5,
+		spread = {x=10, y=10, z=10},
+		scale = 1,
+		offset = 0,
+	},
+	{-- amp 1.75
+		seed = 112,
+		octaves = 3,
+		persist = 0.5,
+		spread = {x=5, y=5, z=5},
+		scale = 1,
+		offset = 0,
+	},
+	--[[forest_bottom = {
+		seed = 11,
+		octaves = 3,
+		persist = 0.8,
+		spread = {x=tmp2, y=tmp2, z=tmp2},
+		scale = 1,
+		offset = 0,
+	},]]
+	forest_top = {-- amp 2.44
+		seed = 21,
+		octaves = 3,
+		persist = 0.8,
+		spread = {x=tmp, y=tmp, z=tmp},
+		scale = 1,
+		offset = 0,
+	},
+}
+
+-- buffers, see https://forum.minetest.net/viewtopic.php?f=18&t=16043
+local pelin_maps
+local pmap1 = {}
+local pmap2 = {}
+local pmap3 = {}
+local pmap_f_top = {}
+local data = {}
+
+local structures_enabled = true
+local vine_maxlength = math.floor(NETHER_HEIGHT/4+0.5)
+-- Create the Nether
+minetest.register_on_generated(function(minp, maxp, seed)
+	--avoid big map generation
+	if not (maxp.y >= NETHER_BOTTOM-100 and minp.y <= nether_start) then
+		return
+	end
+
+	local t1 = minetest.get_us_time()
+	nether:inform("generates at: x=["..minp.x.."; "..maxp.x.."]; y=[" ..
+		minp.y.."; "..maxp.y.."]; z=["..minp.z.."; "..maxp.z.."]", 2)
+
+	define_contents()
+
+	local buildings = 0
+	if maxp.y <= NETHER_BOTTOM then
+		buildings = 1
+	elseif minp.y <= nether_buildings then
+		buildings = 2
+	end
+
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	vm:get_data(data)
+	local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+
+	pr = PseudoRandom(seed+33)
+	local tab,num = {},1
+	local trees,num_trees = {},1
+
+	--local perlin1 = minetest.get_perlin(13,3, 0.5, 50)
+	--local perlin2 = minetest.get_perlin(133,3, 0.5, 10)
+	--local perlin3 = minetest.get_perlin(112,3, 0.5, 5)
+
+	local side_length = maxp.x - minp.x + 1
+	local map_lengths_xyz = {x=side_length, y=side_length, z=side_length}
+
+	if not pelin_maps then
+		pelin_maps = {
+			a = minetest.get_perlin_map(perlins[1], map_lengths_xyz),
+			b = minetest.get_perlin_map(perlins[2], map_lengths_xyz),
+			c = minetest.get_perlin_map(perlins[3], map_lengths_xyz),
+			forest_top = minetest.get_perlin_map(perlins.forest_top,
+				map_lengths_xyz),
+		}
+	end
+	pelin_maps.a:get_2d_map_flat({x=minp.x, y=minp.z}, pmap1)
+	pelin_maps.b:get_2d_map_flat({x=minp.x, y=minp.z}, pmap2)
+	pelin_maps.c:get_2d_map_flat({x=minp.x, y=minp.z}, pmap3)
+
+	local forest_possible = maxp.y > f_h_min and minp.y < f_h_max
+
+	--local pmap_f_bottom = minetest.get_perlin_map(perlins.forest_bottom,
+	-- map_lengths_xyz):get_2d_map_flat({x=minp.x, y=minp.z})
+	local perlin_f_bottom, strassx, strassz
+	if forest_possible then
+		perlin_f_bottom = minetest.get_perlin(11, 3, 0.8, tmp2)
+		pelin_maps.forest_top:get_2d_map_flat({x=minp.x, y=minp.z}, pmap_f_top)
+		strassx = get_ws_list(2, minp.x)
+		strassz = get_ws_list(2, minp.z)
+	end
+
+	local num2, tab2
+	if buildings >= 1 then
+		num2 = 1
+		tab2 = nether_weird_noise({x=minp.x, y=nether_buildings-79, z=minp.z},
+			pymg, 200, 8, 10, side_length-1)
+	end
+
+	local count = 0
+	for z=minp.z, maxp.z do
+		for x=minp.x, maxp.x do
+
+			count = count+1
+
+			local test = pmap1[count]+1
+			local test2 = pmap2[count]
+			local test3 = math.abs(pmap3[count])
+
+			local t = math.floor(test*3+0.5)
+
+			local h
+			if test2 < 0 then
+				h = math.floor(test2*3+0.5)-1
+			else
+				h = 3+t+pr:next(0,NETHER_RANDOM)
+			end
+
+			local generate_vine = false
+			if test3 >= 0.72+pr:next(0,NETHER_RANDOM)/10
+			and pr:next(0,NETHER_RANDOM) == 1 then
+				generate_vine = true
+			end
+
+			local bottom = NETHER_BOTTOM+h
+			local top = nether_middle-pr:next(0,NETHER_RANDOM)+t
+
+			local py_h = 0
+			local difn, noisp, py_h_g
+			if buildings >= 1 then
+				py_h = tab2[num2].y
+				num2 = num2+1
+
+				difn = nether_buildings-py_h
+				if difn == 5 then
+					noisp = 1
+				elseif difn < 5 then
+					noisp = 2
+				end
+				py_h_g = nether_buildings-7
+			end
+
+			local vi = area:index(x, minp.y, z)
+			if buildings == 1
+			and noisp then
+				if noisp == 1 then
+					for _ = 1,side_length do
+						data[vi] = c.netherrack_brick
+						vi = vi + area.ystride
+					end
+				else
+					for _ = 1,side_length do
+						data[vi] = c.lava
+						vi = vi + area.ystride
+					end
+				end
+			else
+
+				local r_structure = pr:next(1,nether_structure_freq)
+				local r_shroom = pr:next(1,NETHER_SHROOM_FREQ)
+				local r_glowstone = pr:next(0,GLOWSTONE_FREQ_ROOF)
+				local r_vine_length = pr:next(1,vine_maxlength)
+
+				local f_bottom, f_top, is_forest, f_h_dirt
+				if forest_possible then
+					local p = {x=math.floor(x/f_bottom_scale),
+						z=math.floor(z/f_bottom_scale)}
+					local pstr = p.x.." "..p.z
+					if not f_perlins[pstr] then
+						f_perlins[pstr] = math.floor(f_h_min + (math.abs(
+							perlin_f_bottom:get_2d{x=p.x, y=p.z} + 1))
+							* f_yscale_bottom + 0.5)
+					end
+					local top_noise = pmap_f_top[count]+1
+					if top_noise < 0 then
+						top_noise = -top_noise/10
+						--nether:inform("ERROR: (perlin noise) "..
+						-- pmap_f_top[count].." is not inside [-1; 1]", 1)
+					end
+					f_top = math.floor(f_h_max - top_noise*f_yscale_top + 0.5)
+					f_bottom = f_perlins[pstr]+pr:next(0,f_bottom_scale-1)
+					is_forest = f_bottom < f_top
+					f_h_dirt = f_bottom-pr:next(0,1)
+				end
+
+				for y=minp.y, maxp.y do
+					local d_p_addp = data[vi]
+					--if py_h >= maxp.y-4 then
+					if y <= py_h
+					and noisp then
+						if noisp == 1 then
+							data[vi] = c.netherrack_brick
+						elseif noisp == 2 then
+							if y == py_h then
+								data[vi] = c.netherrack_brick
+							elseif y == py_h_g
+							and pr:next(1,3) <= 2 then
+								data[vi] = c.netherrack
+							elseif y <= py_h_g then
+								data[vi] = c.lava
+							else
+								data[vi] = c.air
+							end
+						end
+					elseif d_p_addp ~= c.air then
+
+						if is_forest
+						and y == f_bottom then
+							data[vi] = c.nether_dirt_top
+						elseif is_forest
+						and y < f_bottom
+						and y >= f_h_dirt then
+							data[vi] = c.nether_dirt
+						elseif is_forest
+						and y == f_h_dirt-1 then
+							data[vi] = c.nether_dirt_bottom
+						elseif is_forest
+						and y == f_h_dirt+1 then
+							if pr:next(1,tree_rarity) == 1 then
+								trees[num_trees] = {x=x, y=y, z=z}
+								num_trees = num_trees+1
+							elseif pr:next(1,mushroom_rarity) == 1 then
+								data[vi] = c.nether_shroom
+							elseif pr:next(1,glowflower_rarity) == 1 then
+								data[vi] = c.glowflower
+							elseif pr:next(1,grass_rarity) == 1 then
+								data[vi] = c.nether_grass[pr:next(1,3)]
+							else
+								data[vi] = c.air
+							end
+						elseif is_forest
+						and y > f_bottom
+						and y < f_top then
+							if not nether_tree_nodes[d_p_addp] then
+								data[vi] = c.air
+							end
+						elseif is_forest
+						and y == f_top then
+							local sel = math.floor(strassx[x]+strassz[z]+0.5)%10
+							if sel <= 5 then
+								data[vi] = return_nether_ore(d_p_addp, true)
+							elseif sel == 6 then
+								data[vi] = c.netherrack_black
+							elseif sel == 7 then
+								data[vi] = c.glowstone
+							else
+								data[vi] = c.air
+							end
+
+						elseif y <= NETHER_BOTTOM then
+							if y <= bottom then
+								data[vi] = return_nether_ore(d_p_addp, true)
+							else
+								data[vi] = c.lava
+							end
+						elseif r_structure == 1
+						and y == bottom then
+							tab[num] = {x=x, y=y-1, z=z}
+							num = num+1
+						elseif y <= bottom then
+							if pr:next(1,LAVA_FREQ) == 1 then
+								data[vi] = c.lava
+							else
+								data[vi] = return_nether_ore(d_p_addp, false)
+							end
+						elseif r_shroom == 1
+						and r_structure ~= 1
+						and y == bottom+1 then
+							data[vi] = c.nether_shroom
+						elseif (y == top and r_glowstone == 1) then
+							data[vi] = c.glowstone
+						elseif y >= top then
+							data[vi] = return_nether_ore(d_p_addp, true)
+						elseif y <= top-1
+						and generate_vine
+						and y >= top-r_vine_length then
+							data[vi] = c.nether_vine
+						else
+							data[vi] = c.air
+						end
+					end
+					vi = vi + area.ystride
+				end
+			end
+		end
+	end
+	vm:set_data(data)
+--	vm:set_lighting(12)
+--	vm:calc_lighting()
+--	vm:update_liquids()
+	vm:write_to_map(false)
+
+	nether:inform("nodes set", 2, t1)
+
+	local t2 = minetest.get_us_time()
+	local tr_bl_cnt = 0
+
+	if structures_enabled then -- Blood netherstructures
+		tr_bl_cnt = #tab
+		for i = 1,tr_bl_cnt do
+			nether.grow_netherstructure(tab[i], true)
+		end
+	end
+
+	if forest_possible then -- Forest trees
+		tr_bl_cnt = tr_bl_cnt + #trees
+		for i = 1,#trees do
+			nether.grow_tree(trees[i], true)
+		end
+	end
+
+	if tr_bl_cnt > 0 then
+		nether:inform(tr_bl_cnt .. " trees and blood structures set", 2, t2)
+	end
+
+	t2 = minetest.get_us_time()
+	minetest.fix_light(minp, maxp)
+
+	nether:inform("light fixed", 2, t2)
+
+	nether:inform("done", 1, t1)
+end)
diff --git a/nether/portal.lua b/nether/portal.lua
index d8b325b..d3240ed 100644
--- a/nether/portal.lua
+++ b/nether/portal.lua
@@ -1,7 +1,11 @@
 --code copied from Pilzadam's nether mod and edited
 
+local nether_start = nether.v.nether_start
+local nether_bottom = nether.v.nether_bottom
+local nether_buildings = nether.v.nether_buildings
+
 -- kills the player if he uses PilzAdam portal
-local portal_target = nether.buildings+1
+local portal_target = nether_buildings+1
 local damage_enabled = minetest.settings:get_bool"enable_damage"
 local mclike_portal = false
 
@@ -44,7 +48,7 @@ end
 -- Nether aware mods will need to know if a player is in the nether.
 function nether.is_player_in_nether(player)
 	local pos = player:get_pos()
-	return (pos.y < nether.start) and (pos.y >= nether.bottom)
+	return (pos.y < nether_start) and (pos.y >= nether_bottom)
 end
 
 -- For testing nether trap state tracking.
@@ -73,7 +77,7 @@ function nether.external_nether_teleport(player, pos)
 		player:set_pos(pos)
 		return
 	end
-	local destination_in_nether = (pos.y < nether.start) and (pos.y >= nether.bottom)
+	local destination_in_nether = (pos.y < nether_start) and (pos.y >= nether_bottom)
 	update_background(player, destination_in_nether)
 	local pname = player:get_player_name()
 	players_trapped_in_nether[pname] = destination_in_nether or nil
@@ -84,7 +88,7 @@ end
 -- Has nether.trap_players been disabled?
 function nether.registry_update(player)
 	local pos = player:get_pos()
-	local in_nether = (pos.y < nether.start) and (pos.y >= nether.bottom)
+	local in_nether = (pos.y < nether_start) and (pos.y >= nether_bottom)
 	local pname = player:get_player_name()
 	if nether.trap_players then
 		players_trapped_in_nether[pname] = in_nether or nil
@@ -334,7 +338,7 @@ if nether.trap_players then
 		local in_nether = players_trapped_in_nether[pname] == true
 
 		-- test if the target is valid
-		if pos.y < nether.start then
+		if pos.y < nether_start then
 			if in_nether then
 				return true
 			end
@@ -344,7 +348,7 @@ if nether.trap_players then
 
 		-- test if the current position is valid
 		local current_pos = player:get_pos()
-		local now_in_nether = current_pos.y < nether.start
+		local now_in_nether = current_pos.y < nether_start
 		if now_in_nether ~= in_nether then
 			if in_nether then
 				minetest.log("action", "Player \"" .. pname ..
@@ -372,7 +376,7 @@ if nether.trap_players then
 	local metatable_overridden
 	minetest.register_on_joinplayer(function(player)
 		-- set the background when the player joins
-		if player:get_pos().y < nether.start then
+		if player:get_pos().y < nether_start then
 			update_background(player, true)
 		end
 
@@ -559,7 +563,7 @@ local function make_portal(pos)
 		return false
 	end
 
-	local in_nether = p1.y < nether.start
+	local in_nether = p1.y < nether_start
 
 	if in_nether
 	and not mclike_portal then
@@ -788,7 +792,7 @@ function nether.teleport_player(player)
 	end
 	minetest.sound_play("nether_teleporter", {pos=pos})
 	local meta = minetest.get_meta({x=pos.x, y=pos.y-1, z=pos.z})
-	if pos.y < nether.start then
+	if pos.y < nether_start then
 		set_portal(known_portals_d, pos.z,pos.x, pos.y)
 
 		local my = tonumber(meta:get_string("y"))
diff --git a/nether/settings.lua b/nether/settings.lua
index f0f97db..5b836ca 100644
--- a/nether/settings.lua
+++ b/nether/settings.lua
@@ -5,7 +5,7 @@ local default_settings = {
 	overworld_help = true,
 }
 
-nether.settings = {}
+nether.settings = {} -- FIXME: unused field. store settings in here?
 
 for name,dv in pairs(default_settings) do
 	local setting