Added Watershed mod by Paramat

mods/watershed/README.txt

@@ -0,0 +1,4 @@
+watershed 0.6.6 by paramat
+For latest stable Minetest back to 0.4.8
+Depends default stairs bucket
+Licenses: code WTFPL, textures CC BY-SA

mods/watershed/depends.txt

@@ -0,0 +1,3 @@
+default
+bucket
+stairs

mods/watershed/functions.lua

@@ -0,0 +1,462 @@
+function watershed_appletree(x, y, z, area, data)
+	local c_tree = minetest.get_content_id("default:tree")
+	local c_apple = minetest.get_content_id("default:apple")
+	local c_wsappleaf = minetest.get_content_id("watershed:appleleaf")
+	for j = -2, 4 do
+		if j == 3 or j == 4 then
+			for i = -2, 2 do
+			for k = -2, 2 do
+				local vil = area:index(x + i, y + j, z + k)
+				if math.random(64) == 2 then
+					data[vil] = c_apple
+				elseif math.random(5) ~= 2 then
+					data[vil] = c_wsappleaf
+				end
+			end
+			end
+		elseif j == 2 then
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if math.abs(i) + math.abs(k) == 2 then
+					local vit = area:index(x + i, y + j, z + k)
+					data[vit] = c_tree
+				end
+			end
+			end
+		else
+			local vit = area:index(x, y + j, z)
+			data[vit] = c_tree
+		end
+	end
+end
+
+function watershed_pinetree(x, y, z, area, data)
+	local c_wspitree = minetest.get_content_id("watershed:pinetree")
+	local c_wsneedles = minetest.get_content_id("watershed:needles")
+	local c_snowblock = minetest.get_content_id("default:snowblock")
+	for j = -4, 14 do
+		if j == 3 or j == 6 or j == 9 or j == 12 then
+			for i = -2, 2 do
+			for k = -2, 2 do
+				if math.abs(i) == 2 or math.abs(k) == 2 then
+					if math.random(7) ~= 2 then
+						local vil = area:index(x + i, y + j, z + k)
+						data[vil] = c_wsneedles
+						local vila = area:index(x + i, y + j + 1, z + k)
+						data[vila] = c_snowblock
+					end
+				end
+			end
+			end
+		elseif j == 4 or j == 7 or j == 10 then
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if not (i == 0 and j == 0) then
+					if math.random(11) ~= 2 then
+						local vil = area:index(x + i, y + j, z + k)
+						data[vil] = c_wsneedles
+						local vila = area:index(x + i, y + j + 1, z + k)
+						data[vila] = c_snowblock
+					end
+				end
+			end
+			end
+		elseif j == 13 then
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if not (i == 0 and j == 0) then
+					local vil = area:index(x + i, y + j, z + k)
+					data[vil] = c_wsneedles
+					local vila = area:index(x + i, y + j + 1, z + k)
+					data[vila] = c_wsneedles
+					local vilaa = area:index(x + i, y + j + 2, z + k)
+					data[vilaa] = c_snowblock
+				end
+			end
+			end
+		end
+		local vit = area:index(x, y + j, z)
+		data[vit] = c_wspitree
+	end
+	local vil = area:index(x, y + 15, z)
+	local vila = area:index(x, y + 16, z)
+	local vilaa = area:index(x, y + 17, z)
+	data[vil] = c_wsneedles
+	data[vila] = c_wsneedles
+	data[vilaa] = c_snowblock
+end
+
+function watershed_jungletree(x, y, z, area, data)
+	local c_juntree = minetest.get_content_id("default:jungletree")
+	local c_wsjunleaf = minetest.get_content_id("watershed:jungleleaf")
+	local c_vine = minetest.get_content_id("watershed:vine")
+	local top = math.random(17,23)
+	local branch = math.floor(top * 0.6)
+	for j = -5, top do
+		if j == top or j == top - 1 or j == branch + 1 or j == branch + 2 then
+			for i = -2, 2 do -- leaves
+			for k = -2, 2 do
+				local vi = area:index(x + i, y + j, z + k)
+				if math.random(5) ~= 2 then
+					data[vi] = c_wsjunleaf
+				end
+			end
+			end
+		elseif j == top - 2 or j == branch then -- branches
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if math.abs(i) + math.abs(k) == 2 then
+					local vi = area:index(x + i, y + j, z + k)
+					data[vi] = c_juntree
+				end
+			end
+			end
+		end
+		if j >= 0 and j <= top - 3 then -- climbable nodes
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if math.abs(i) + math.abs(k) == 1 then
+					local vi = area:index(x + i, y + j, z + k)
+					data[vi] = c_vine
+				end
+			end
+			end
+		end
+		if j <= top - 3 then -- trunk
+			local vi = area:index(x, y + j, z)
+			data[vi] = c_juntree
+		end
+	end
+end
+
+function watershed_acaciatree(x, y, z, area, data)
+	local c_wsactree = minetest.get_content_id("watershed:acaciatree")
+	local c_wsacleaf = minetest.get_content_id("watershed:acacialeaf")
+	for j = -3, 6 do
+		if j == 6 then
+			for i = -4, 4 do
+			for k = -4, 4 do
+				if not (i == 0 or k == 0) then
+					if math.random(7) ~= 2 then
+						local vil = area:index(x + i, y + j, z + k)
+						data[vil] = c_wsacleaf
+					end
+				end
+			end
+			end
+		elseif j == 5 then
+			for i = -2, 2, 4 do
+			for k = -2, 2, 4 do
+				local vit = area:index(x + i, y + j, z + k)
+				data[vit] = c_wsactree
+			end
+			end
+		elseif j == 4 then
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if math.abs(i) + math.abs(k) == 2 then
+					local vit = area:index(x + i, y + j, z + k)
+					data[vit] = c_wsactree
+				end
+			end
+			end
+		else
+			local vit = area:index(x, y + j, z)
+			data[vit] = c_wsactree
+		end
+	end
+end
+
+function watershed_flower(data, vi, noise)
+	local c_danwhi = minetest.get_content_id("flowers:dandelion_white")
+	local c_danyel = minetest.get_content_id("flowers:dandelion_yellow")
+	local c_rose = minetest.get_content_id("flowers:rose")
+	local c_tulip = minetest.get_content_id("flowers:tulip")
+	local c_geranium = minetest.get_content_id("flowers:geranium")
+	local c_viola = minetest.get_content_id("flowers:viola")
+	if noise > 0.8 then
+		data[vi] = c_danwhi
+	elseif noise > 0.4 then
+		data[vi] = c_rose
+	elseif noise > 0 then
+		data[vi] = c_tulip
+	elseif noise > -0.4 then
+		data[vi] = c_danyel
+	elseif noise > -0.8 then
+		data[vi] = c_geranium
+	else
+		data[vi] = c_viola
+	end
+end
+
+function watershed_cactus(x, y, z, area, data)
+	local c_wscactus = minetest.get_content_id("watershed:cactus")
+	for j = -2, 4 do
+	for i = -2, 2 do
+		if i == 0 or j == 2 or (j == 3 and math.abs(i) == 2) then
+			local vic = area:index(x + i, y + j, z)
+			data[vic] = c_wscactus
+		end
+	end
+	end
+end
+
+function watershed_papyrus(x, y, z, area, data)
+	local c_papyrus = minetest.get_content_id("default:papyrus")
+	local ph = math.random(1, 4)
+	for j = 0, ph do
+		local vip = area:index(x, y + j, z)
+		data[vip] = c_papyrus
+	end
+end
+
+-- Singlenode option
+
+local SINGLENODE = true
+
+if SINGLENODE then
+	-- Set mapgen parameters
+
+	minetest.register_on_mapgen_init(function(mgparams)
+		minetest.set_mapgen_params({mgname="singlenode", flags="nolight"})
+	end)
+
+	-- Spawn player function. Requires chunksize = 80 nodes (the default)
+
+	function spawnplayer(player)
+		local TERCEN = -128
+		local TERSCA = 512
+		local XLSAMP = 0.1
+		local BASAMP = 0.3
+		local MIDAMP = 0.1
+		local CANAMP = 0.4
+		local ATANAMP = 1.1
+		local BLENEXP = 2
+		local xsp
+		local ysp
+		local zsp
+
+		local np_terrain = {
+			offset = 0,
+			scale = 1,
+			spread = {x=384, y=192, z=384},
+			seed = 593,
+			octaves = 5,
+			persist = 0.67
+		}
+		local np_mid = {
+			offset = 0,
+			scale = 1,
+			spread = {x=768, y=768, z=1},
+			seed = 85546,
+			octaves = 5,
+			persist = 0.5
+		}
+		local np_base = {
+			offset = 0,
+			scale = 1,
+			spread = {x=4096, y=4096, z=1},
+			seed = 8890,
+			octaves = 3,
+			persist = 0.33
+		}
+		local np_xlscale = {
+			offset = 0,
+			scale = 1,
+			spread = {x=8192, y=8192, z=1},
+			seed = -72,
+			octaves = 3,
+			persist = 0.33
+		}
+
+		local nobj_terrain = nil
+		local nobj_mid     = nil
+		local nobj_base    = nil
+		local nobj_xlscale = nil
+
+		for chunk = 1, 64 do
+			print ("[watershed] searching for spawn "..chunk)
+			local x0 = 80 * math.random(-32, 32) - 32
+			local z0 = 80 * math.random(-32, 32) - 32
+			local y0 = -32
+			local x1 = x0 + 79
+			local z1 = z0 + 79
+			local y1 = 47
+			local sidelen = 80
+			local chulensxyz = {x=sidelen, y=sidelen+2, z=sidelen}
+			local chulensxz = {x=sidelen, y=sidelen, z=1}
+			local minposxyz = {x=x0, y=y0-1, z=z0}
+			local minposxz = {x=x0, y=z0}
+
+			nobj_terrain = nobj_terrain or minetest.get_perlin_map(np_terrain, chulensxyz)
+			nobj_mid     = nobj_mid     or minetest.get_perlin_map(np_mid, chulensxz)
+			nobj_base    = nobj_base    or minetest.get_perlin_map(np_base, chulensxz)
+			nobj_xlscale = nobj_xlscale or minetest.get_perlin_map(np_xlscale, chulensxz)
+
+			local nvals_terrain = nobj_terrain:get3dMap_flat(minposxyz)
+			local nvals_mid     = nobj_mid:get2dMap_flat(minposxz)
+			local nvals_base    = nobj_base:get2dMap_flat(minposxz)
+			local nvals_xlscale = nobj_xlscale:get2dMap_flat(minposxz)
+
+			local nixz = 1
+			local nixyz = 1
+			for z = z0, z1 do
+				for y = y0, y1 do
+					for x = x0, x1 do
+						local n_absterrain = math.abs(nvals_terrain[nixyz])
+						local n_absmid = math.abs(nvals_mid[nixz])
+						local n_absbase = math.abs(nvals_base[nixz])
+						local n_xlscale = nvals_xlscale[nixz]
+						
+						local n_invbase = (1 - n_absbase)
+						local terblen = (math.max(n_invbase, 0)) ^ BLENEXP
+						local grad = math.atan((TERCEN - y) / TERSCA) * ATANAMP
+						local densitybase = n_invbase * BASAMP + n_xlscale * XLSAMP + grad
+						local densitymid = n_absmid * MIDAMP + densitybase
+						local canexp = 0.5 + terblen * 0.5
+						local canamp = terblen * CANAMP
+						local density = n_absterrain ^ canexp * canamp * n_absmid + densitymid
+						
+						if y >= 1 and density > -0.005 and density < 0 then
+							ysp = y + 1
+							xsp = x
+							zsp = z
+							break
+						end
+						nixz = nixz + 1
+						nixyz = nixyz + 1
+					end
+					if ysp then
+						break
+					end
+					nixz = nixz - 80
+				end
+				if ysp then
+					break
+				end
+				nixz = nixz + 80
+			end
+			if ysp then
+				break
+			end
+		end
+		print ("[watershed] spawn player ("..xsp.." "..ysp.." "..zsp..")")
+		player:setpos({x=xsp, y=ysp, z=zsp})
+	end
+
+	minetest.register_on_newplayer(function(player)
+		spawnplayer(player)
+	end)
+
+	minetest.register_on_respawnplayer(function(player)
+		spawnplayer(player)
+		return true
+	end)
+end
+
+-- ABM
+
+-- Lava-water cooling
+
+minetest.register_abm({
+	nodenames = {"group:lava"},
+	neighbors = {"group:water"},
+	interval = 11,
+	chance = 64,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		minetest.add_node(pos, {name="default:obsidian"})
+		minetest.sound_play("default_cool_lava", {pos = pos,  gain = 0.25})
+	end,
+})
+
+-- Appletree sapling
+
+minetest.register_abm({
+	nodenames = {"watershed:appling"},
+	interval = 57,
+	chance = 3,
+	action = function(pos, node)
+		local x = pos.x
+		local y = pos.y
+		local z = pos.z
+		local vm = minetest.get_voxel_manip()
+		local pos1 = {x=x-2, y=y-2, z=z-2}
+		local pos2 = {x=x+2, y=y+4, z=z+2}
+		local emin, emax = vm:read_from_map(pos1, pos2)
+		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+		local data = vm:get_data()
+		watershed_appletree(x, y, z, area, data)
+		vm:set_data(data)
+		vm:write_to_map()
+		vm:update_map()
+	end,
+})
+
+-- Pine sapling
+
+minetest.register_abm({
+	nodenames = {"watershed:pineling"},
+	interval = 59,
+	chance = 3,
+	action = function(pos, node)
+		local x = pos.x
+		local y = pos.y
+		local z = pos.z
+		local vm = minetest.get_voxel_manip()
+		local pos1 = {x=x-2, y=y-4, z=z-2}
+		local pos2 = {x=x+2, y=y+17, z=z+2}
+		local emin, emax = vm:read_from_map(pos1, pos2)
+		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+		local data = vm:get_data()
+		watershed_pinetree(x, y, z, area, data)
+		vm:set_data(data)
+		vm:write_to_map()
+		vm:update_map()
+	end,
+})
+
+-- Acacia sapling
+
+minetest.register_abm({
+	nodenames = {"watershed:acacialing"},
+	interval = 61,
+	chance = 3,
+	action = function(pos, node)
+		local x = pos.x
+		local y = pos.y
+		local z = pos.z
+		local vm = minetest.get_voxel_manip()
+		local pos1 = {x=x-4, y=y-3, z=z-4}
+		local pos2 = {x=x+4, y=y+6, z=z+4}
+		local emin, emax = vm:read_from_map(pos1, pos2)
+		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+		local data = vm:get_data()
+		watershed_acaciatree(x, y, z, area, data)
+		vm:set_data(data)
+		vm:write_to_map()
+		vm:update_map()
+	end,
+})
+
+-- Jungletree sapling
+
+minetest.register_abm({
+	nodenames = {"watershed:jungling"},
+	interval = 63,
+	chance = 3,
+	action = function(pos, node)
+		local x = pos.x
+		local y = pos.y
+		local z = pos.z
+		local vm = minetest.get_voxel_manip()
+		local pos1 = {x=x-2, y=y-5, z=z-2}
+		local pos2 = {x=x+2, y=y+23, z=z+2}
+		local emin, emax = vm:read_from_map(pos1, pos2)
+		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+		local data = vm:get_data()
+		watershed_jungletree(x, y, z, area, data)
+		vm:set_data(data)
+		vm:write_to_map()
+		vm:update_map()
+	end,
+})

mods/watershed/init.lua

@@ -0,0 +1,740 @@
+-- watershed 0.6.6 by paramat
+-- For latest stable Minetest and back to 0.4.8
+-- Depends default stairs bucket
+-- License: code WTFPL, textures CC BY-SA
+
+-- re-add z=1 for z component of 2D noisemap size to fix crashes
+
+-- Parameters
+
+local YMIN = -33000 -- Approximate base of realm stone
+local YMAX = 33000 -- Approximate top of atmosphere / mountains / floatlands
+local TERCEN = -128 -- Terrain zero level, average seabed
+local YWAT = 1 -- Sea surface y
+local YSAV = 5 -- Average sandline y, dune grasses above this
+local SAMP = 3 -- Sandline amplitude
+local YCLOMIN = 207 -- Minimum height of mod clouds
+local CLOUDS = true -- Mod clouds?
+
+local TERSCA = 512 -- Vertical terrain scale
+local XLSAMP = 0.1 -- Extra large scale height variation amplitude
+local BASAMP = 0.3 -- Base terrain amplitude
+local MIDAMP = 0.1 -- Mid terrain amplitude
+local CANAMP = 0.4 -- Canyon terrain maximum amplitude
+local ATANAMP = 1.1 -- Arctan function amplitude, smaller = more and larger floatlands above ridges
+local BLENEXP = 2 -- Terrain blend exponent
+
+local TSTONE = 0.02 -- Density threshold for stone, depth of soil at TERCEN
+local TRIVER = -0.028 -- Densitybase threshold for river surface
+local TRSAND = -0.035 -- Densitybase threshold for river sand
+local TSTREAM = -0.004 -- Densitymid threshold for stream surface
+local TSSAND = -0.005 -- Densitymid threshold for stream sand
+local TLAVA = 2 -- Maximum densitybase threshold for lava, small because grad is non-linear
+local TFIS = 0.01 -- Fissure threshold, controls width
+local TSEAM = 0.2 -- Seam threshold, width of seams
+local ORESCA = 512 -- Seam system vertical scale
+local ORETHI = 0.002 -- Ore seam thickness tuner
+local BERGDEP = 32 -- Maximum iceberg depth
+local TFOG = -0.04 -- Fog top densitymid threshold
+
+local HITET = 0.35 -- High temperature threshold
+local LOTET = -0.35 -- Low ..
+local ICETET = -0.7 -- Ice ..
+local HIHUT = 0.35 -- High humidity threshold
+local LOHUT = -0.35 -- Low ..
+local FOGHUT = 1.0 -- Fog ..
+local BLEND = 0.02 -- Biome blend randomness
+
+local flora = {
+	PINCHA = 36, -- Pine tree 1/x chance per node
+	APTCHA = 36, -- Appletree
+	FLOCHA = 289, -- Flower
+	GRACHA = 36, -- Grassland grasses
+	JUTCHA = 16, -- Jungletree
+	JUGCHA = 16, -- Junglegrass
+	CACCHA = 2209, -- Cactus
+	DRYCHA = 121, -- Dry shrub
+	ACACHA = 1369, -- Acacia tree
+	GOGCHA = 9, -- Golden grass
+	PAPCHA = 4, -- Papyrus
+	DUGCHA = 16, -- Dune grass
+}
+
+-- 3D noises
+
+-- 3D noise for terrain
+
+local np_terrain = {
+	offset = 0,
+	scale = 1,
+	spread = {x=384, y=192, z=384},
+	seed = 593,
+	octaves = 5,
+	persist = 0.67
+}
+
+-- 3D noise for fissures
+
+local np_fissure = {
+	offset = 0,
+	scale = 1,
+	spread = {x=256, y=512, z=256},
+	seed = 20099,
+	octaves = 5,
+	persist = 0.5
+}
+
+-- 3D noise for temperature
+
+local np_temp = {
+	offset = 0,
+	scale = 1,
+	spread = {x=1024, y=1024, z=1024},
+	seed = 9130,
+	octaves = 3,
+	persist = 0.5
+}
+
+-- 3D noise for humidity
+
+local np_humid = {
+	offset = 0,
+	scale = 1,
+	spread = {x=1024, y=1024, z=1024},
+	seed = -55500,
+	octaves = 3,
+	persist = 0.5
+}
+
+-- 3D noise for ore seam networks
+
+local np_seam = {
+	offset = 0,
+	scale = 1,
+	spread = {x=512, y=512, z=512},
+	seed = -992221,
+	octaves = 2,
+	persist = 0.5
+}
+
+-- 3D noise for rock strata inclination
+
+local np_strata = {
+	offset = 0,
+	scale = 1,
+	spread = {x=512, y=512, z=512},
+	seed = 92219,
+	octaves = 3,
+	persist = 0.5
+}
+
+-- 2D noises
+
+-- 2D noise for mid terrain / streambed height
+
+local np_mid = {
+	offset = 0,
+	scale = 1,
+	spread = {x=768, y=768, z=768},
+	seed = 85546,
+	octaves = 5,
+	persist = 0.5
+}
+
+-- 2D noise for base terrain / riverbed height
+
+local np_base = {
+	offset = 0,
+	scale = 1,
+	spread = {x=4096, y=4096, z=4096},
+	seed = 8890,
+	octaves = 3,
+	persist = 0.33
+}
+
+-- 2D noise for extra large scale height variation
+
+local np_xlscale = {
+	offset = 0,
+	scale = 1,
+	spread = {x=8192, y=8192, z=8192},
+	seed = -72,
+	octaves = 3,
+	persist = 0.33
+}
+
+-- 2D noise for magma surface
+
+local np_magma = {
+	offset = 0,
+	scale = 1,
+	spread = {x=128, y=128, z=128},
+	seed = -13,
+	octaves = 2,
+	persist = 0.5
+}
+
+
+-- Stuff
+
+-- initialize 3D and 2D noise objects to nil
+
+local nobj_terrain = nil
+local nobj_fissure = nil
+local nobj_temp    = nil
+local nobj_humid   = nil
+local nobj_seam    = nil
+local nobj_strata  = nil
+	
+local nobj_mid     = nil
+local nobj_base    = nil
+local nobj_xlscale = nil
+local nobj_magma   = nil
+
+dofile(minetest.get_modpath("watershed").."/nodes.lua")
+dofile(minetest.get_modpath("watershed").."/functions.lua")
+
+
+-- Mapchunk generation function
+
+function watershed_chunkgen(x0, y0, z0, x1, y1, z1, area, data)
+	local c_air = minetest.get_content_id("air")
+	local c_ignore = minetest.get_content_id("ignore")
+	local c_water = minetest.get_content_id("default:water_source")
+	local c_sand = minetest.get_content_id("default:sand")
+	local c_desand = minetest.get_content_id("default:desert_sand")
+	local c_snowblock = minetest.get_content_id("default:snowblock")
+	local c_ice = minetest.get_content_id("default:ice")
+	local c_dirtsnow = minetest.get_content_id("default:dirt_with_snow")
+	local c_jungrass = minetest.get_content_id("default:junglegrass")
+	local c_dryshrub = minetest.get_content_id("default:dry_shrub")
+	local c_danwhi = minetest.get_content_id("flowers:dandelion_white")
+	local c_danyel = minetest.get_content_id("flowers:dandelion_yellow")
+	local c_rose = minetest.get_content_id("flowers:rose")
+	local c_tulip = minetest.get_content_id("flowers:tulip")
+	local c_geranium = minetest.get_content_id("flowers:geranium")
+	local c_viola = minetest.get_content_id("flowers:viola")
+	local c_stodiam = minetest.get_content_id("default:stone_with_diamond")
+	local c_mese = minetest.get_content_id("default:mese")
+	local c_stogold = minetest.get_content_id("default:stone_with_gold")
+	local c_stocopp = minetest.get_content_id("default:stone_with_copper")
+	local c_stoiron = minetest.get_content_id("default:stone_with_iron")
+	local c_stocoal = minetest.get_content_id("default:stone_with_coal")
+	local c_sandstone = minetest.get_content_id("default:sandstone")
+	local c_gravel = minetest.get_content_id("default:gravel")
+	local c_clay = minetest.get_content_id("default:clay")
+	local c_grass5 = minetest.get_content_id("default:grass_5")
+	local c_obsidian = minetest.get_content_id("default:obsidian")
+	
+	local c_wsfreshwater = minetest.get_content_id("watershed:freshwater")
+	local c_wsmixwater = minetest.get_content_id("watershed:mixwater")
+	local c_wsstone = minetest.get_content_id("watershed:stone")
+	local c_wsredstone = minetest.get_content_id("watershed:redstone")
+	local c_wsgrass = minetest.get_content_id("watershed:grass")
+	local c_wsdrygrass = minetest.get_content_id("watershed:drygrass")
+	local c_wsgoldengrass = minetest.get_content_id("watershed:goldengrass")
+	local c_wsdirt = minetest.get_content_id("watershed:dirt")
+	local c_wspermafrost = minetest.get_content_id("watershed:permafrost")
+	local c_wslava = minetest.get_content_id("watershed:lava")
+	local c_wsfreshice = minetest.get_content_id("watershed:freshice")
+	local c_wscloud = minetest.get_content_id("watershed:cloud")
+	local c_wsluxore = minetest.get_content_id("watershed:luxore")
+	local c_wsicydirt = minetest.get_content_id("watershed:icydirt")
+	-- perlinmap stuff
+	local sidelen = x1 - x0 + 1 -- chunk sidelength
+	local chulensxyz = {x=sidelen, y=sidelen+2, z=sidelen} -- chunk dimensions, '+2' for overgeneration
+	local chulensxz = {x=sidelen, y=sidelen, z=1} -- here x = map x, y = map z
+	local minposxyz = {x=x0, y=y0-1, z=z0}
+	local minposxz = {x=x0, y=z0} -- here x = map x, y = map z
+	-- 3D and 2D noise objects created once on first mapchunk generation only
+	nobj_terrain = nobj_terrain or minetest.get_perlin_map(np_terrain, chulensxyz)
+	nobj_fissure = nobj_fissure or minetest.get_perlin_map(np_fissure, chulensxyz)
+	nobj_temp    = nobj_temp    or minetest.get_perlin_map(np_temp, chulensxyz)
+	nobj_humid   = nobj_humid   or minetest.get_perlin_map(np_humid, chulensxyz)
+	nobj_seam    = nobj_seam    or minetest.get_perlin_map(np_seam, chulensxyz)
+	nobj_strata  = nobj_strata  or minetest.get_perlin_map(np_strata, chulensxyz)
+	
+	nobj_mid     = nobj_mid     or minetest.get_perlin_map(np_mid, chulensxz)
+	nobj_base    = nobj_base    or minetest.get_perlin_map(np_base, chulensxz)
+	nobj_xlscale = nobj_xlscale or minetest.get_perlin_map(np_xlscale, chulensxz)
+	nobj_magma   = nobj_magma   or minetest.get_perlin_map(np_magma, chulensxz)
+	-- 3D and 2D perlinmaps created per mapchunk
+	local nvals_terrain = nobj_terrain:get3dMap_flat(minposxyz)
+	local nvals_fissure = nobj_fissure:get3dMap_flat(minposxyz)
+	local nvals_temp    = nobj_temp:get3dMap_flat(minposxyz)
+	local nvals_humid   = nobj_humid:get3dMap_flat(minposxyz)
+	local nvals_seam    = nobj_seam:get3dMap_flat(minposxyz)
+	local nvals_strata  = nobj_strata:get3dMap_flat(minposxyz)
+	
+	local nvals_mid     = nobj_mid:get2dMap_flat(minposxz)
+	local nvals_base    = nobj_base:get2dMap_flat(minposxz)
+	local nvals_xlscale = nobj_xlscale:get2dMap_flat(minposxz)
+	local nvals_magma   = nobj_magma:get2dMap_flat(minposxz)
+	-- ungenerated chunk below?
+	local viu = area:index(x0, y0-1, z0)
+	local ungen = data[viu] == c_ignore
+
+	-- mapgen loop
+	local nixyz = 1 -- 3D and 2D perlinmap indexes
+	local nixz = 1
+	local stable = {} -- stability table of true/false. is node supported from below by 2 stone or nodes on 2 stone?
+	local under = {} -- biome table. biome number of previous fine material placed in column
+	for z = z0, z1 do -- for each xy plane progressing northwards
+		for y = y0 - 1, y1 + 1 do -- for each x row progressing upwards
+			local vi = area:index(x0, y, z) -- voxelmanip index for first node in this x row
+			local viu = area:index(x0, y-1, z) -- index for under node
+			for x = x0, x1 do -- for each node do
+				local si = x - x0 + 1 -- stable, under tables index
+				-- noise values for node
+				local n_absterrain = math.abs(nvals_terrain[nixyz])
+				local n_fissure = nvals_fissure[nixyz]
+				local n_temp = nvals_temp[nixyz]
+				local n_humid = nvals_humid[nixyz]
+				local n_seam = nvals_seam[nixyz]
+				local n_strata = nvals_strata[nixyz]
+				
+				local n_absmid = math.abs(nvals_mid[nixz])
+				local n_absbase = math.abs(nvals_base[nixz])
+				local n_xlscale = nvals_xlscale[nixz]
+				local n_magma = nvals_magma[nixz]
+				-- get densities
+				local n_invbase = (1 - n_absbase)
+				local terblen = (math.max(n_invbase, 0)) ^ BLENEXP
+				local grad = math.atan((TERCEN - y) / TERSCA) * ATANAMP
+				local densitybase = n_invbase * BASAMP + n_xlscale * XLSAMP + grad
+				local densitymid = n_absmid * MIDAMP + densitybase
+				local canexp = 0.5 + terblen * 0.5
+				local canamp = terblen * CANAMP
+				local density = n_absterrain ^ canexp * canamp * n_absmid + densitymid
+				-- other values
+				local triver = TRIVER * n_absbase -- river threshold
+				local trsand = TRSAND * n_absbase -- river sand
+				local tstream = TSTREAM * (1 - n_absmid) -- stream threshold
+				local tssand = TSSAND * (1 - n_absmid) -- stream sand
+				local tstone = TSTONE * (1 + grad) -- stone threshold
+				local tlava = TLAVA * (1 - n_magma ^ 4 * terblen ^ 16 * 0.6) -- lava threshold
+				local ysand = YSAV + n_fissure * SAMP + math.random() * 2 -- sandline
+				local bergdep = math.abs(n_seam) * BERGDEP -- iceberg depth
+				
+				local nofis = false -- set fissure bool
+				if math.abs(n_fissure) >= TFIS then
+					nofis = true
+				end
+				
+				local biome = false -- select biome for node
+				if n_temp < LOTET + (math.random() - 0.5) * BLEND then
+					if n_humid < LOHUT + (math.random() - 0.5) * BLEND then
+						biome = 1 -- tundra
+					elseif n_humid > HIHUT + (math.random() - 0.5) * BLEND then
+						biome = 3 -- taiga
+					else
+						biome = 2 -- snowy plains
+					end
+				elseif n_temp > HITET + (math.random() - 0.5) * BLEND then
+					if n_humid < LOHUT + (math.random() - 0.5) * BLEND then
+						biome = 7 -- desert
+					elseif n_humid > HIHUT + (math.random() - 0.5) * BLEND then
+						biome = 9 -- rainforest
+					else
+						biome = 8 -- savanna
+					end
+				else
+					if n_humid < LOHUT then
+						biome = 4 -- dry grassland
+					elseif n_humid > HIHUT then
+						biome = 6 -- deciduous forest
+					else
+						biome = 5 -- grassland
+					end
+				end
+				
+				-- overgeneration and in-chunk generation
+				if y == y0 - 1 then -- node layer below chunk, initialise tables
+					under[si] = 0
+					if ungen then
+						if nofis and density >= 0 then -- if node solid
+							stable[si] = 2
+						else
+							stable[si] = 0
+						end
+					else -- scan top layer of chunk below
+						local nodid = data[vi]
+						if nodid == c_wsstone
+						or nodid == c_wsredstone
+						or nodid == c_wsdirt
+						or nodid == c_wspermafrost
+						or nodid == c_wsluxore
+						or nodid == c_sand
+						or nodid == c_desand
+						or nodid == c_mese
+						or nodid == c_stodiam
+						or nodid == c_stogold
+						or nodid == c_stocopp
+						or nodid == c_stoiron
+						or nodid == c_stocoal
+						or nodid == c_sandstone
+						or nodid == c_gravel
+						or nodid == c_clay
+						or nodid == c_obsidian then
+							stable[si] = 2
+						else
+							stable[si] = 0
+						end
+					end
+				elseif y >= y0 and y <= y1 then -- chunk
+					-- add nodes and flora
+					if densitybase >= tlava then -- lava
+						if densitybase >= 0 then
+							data[vi] = c_wslava
+						end
+						stable[si] = 0
+						under[si] = 0
+					elseif densitybase >= tlava - math.min(0.6 + density * 6, 0.6)
+					and density < tstone then -- obsidian
+						data[vi] = c_obsidian
+						stable[si] = 1
+						under[si] = 0
+					elseif density >= tstone and nofis  -- stone cut by fissures
+					or (density >= tstone and density < TSTONE * 1.2 and y <= YWAT) -- stone around water
+					or (density >= tstone and density < TSTONE * 1.2 and densitybase >= triver ) -- stone around river
+					or (density >= tstone and density < TSTONE * 1.2 and densitymid >= tstream ) then -- stone around stream
+						local densitystr = n_strata * 0.25 + (TERCEN - y) / ORESCA
+						local densityper = densitystr - math.floor(densitystr) -- periodic strata 'density'
+						if (densityper >= 0.05 and densityper <= 0.09) -- sandstone strata
+						or (densityper >= 0.25 and densityper <= 0.28)
+						or (densityper >= 0.45 and densityper <= 0.47)
+						or (densityper >= 0.74 and densityper <= 0.76)
+						or (densityper >= 0.77 and densityper <= 0.79)
+						or (densityper >= 0.84 and densityper <= 0.87)
+						or (densityper >= 0.95 and densityper <= 0.98) then
+							data[vi] = c_sandstone
+						elseif biome == 7 and density < TSTONE * 3 then -- desert stone as surface layer
+							data[vi] = c_wsredstone
+						elseif math.abs(n_seam) < TSEAM then
+							if densityper >= 0 and densityper <= ORETHI * 4 then -- ore seams
+								data[vi] = c_stocoal
+							elseif densityper >= 0.3 and densityper <= 0.3 + ORETHI * 4 then
+								data[vi] = c_stocoal
+							elseif densityper >= 0.5 and densityper <= 0.5 + ORETHI * 4 then
+								data[vi] = c_stocoal
+							elseif densityper >= 0.8 and densityper <= 0.8 + ORETHI * 4 then
+								data[vi] = c_stocoal
+							elseif densityper >= 0.55 and densityper <= 0.55 + ORETHI * 2 then
+								data[vi] = c_gravel
+							elseif densityper >= 0.1 and densityper <= 0.1 + ORETHI * 2 then
+								data[vi] = c_wsluxore
+							elseif densityper >= 0.2 and densityper <= 0.2 + ORETHI * 2
+							and math.random(2) == 2 then
+								data[vi] = c_stoiron
+							elseif densityper >= 0.65 and densityper <= 0.65 + ORETHI * 2
+							and math.random(2) == 2 then
+								data[vi] = c_stoiron
+							elseif densityper >= 0.4 and densityper <= 0.4 + ORETHI * 2
+							and math.random(3) == 2 then
+								data[vi] = c_stocopp
+							elseif densityper >= 0.6 and densityper <= 0.6 + ORETHI
+							and math.random(5) == 2 then
+								data[vi] = c_stogold
+							elseif densityper >= 0.7 and densityper <= 0.7 + ORETHI
+							and math.random(7) == 2 then
+								data[vi] = c_mese
+							elseif densityper >= 0.9 and densityper <= 0.9 + ORETHI
+							and math.random(11) == 2 then
+								data[vi] = c_stodiam
+							else
+								data[vi] = c_wsstone
+							end
+						else
+							data[vi] = c_wsstone
+						end
+						stable[si] = stable[si] + 1
+						under[si] = 0
+					elseif density >= 0 and density < tstone and stable[si] >= 2 then -- fine materials
+						if y == YWAT - 2 and math.abs(n_temp) < 0.05 then -- clay
+							data[vi] = c_clay
+						elseif y <= ysand then -- seabed/beach/dune sand not cut by fissures
+							data[vi] = c_sand
+							under[si] = 10 -- beach/dunes
+						elseif densitybase >= trsand + math.random() * 0.001 then -- river sand
+							data[vi] = c_sand
+							under[si] = 11 -- riverbank papyrus
+						elseif densitymid >= tssand + math.random() * 0.001 then -- stream sand
+							data[vi] = c_sand
+							under[si] = 0
+						elseif nofis then -- fine materials cut by fissures
+							if biome == 1 then
+								data[vi] = c_wspermafrost
+								under[si] = 1 -- tundra
+							elseif biome == 2 then
+								data[vi] = c_wsdirt
+								under[si] = 2 -- snowy plains
+							elseif biome == 3 then
+								data[vi] = c_wsdirt
+								under[si] = 3 -- taiga
+							elseif biome == 4 then
+								data[vi] = c_wsdirt
+								under[si] = 4 -- dry grassland
+							elseif biome == 5 then
+								data[vi] = c_wsdirt
+								under[si] = 5 -- grassland
+							elseif biome == 6 then
+								data[vi] = c_wsdirt
+								under[si] = 6 -- forest
+							elseif biome == 7 then
+								data[vi] = c_desand
+								under[si] = 7 -- desert
+							elseif biome == 8 then
+								data[vi] = c_wsdirt
+								under[si] = 8 -- savanna
+							elseif biome == 9 then
+								data[vi] = c_wsdirt
+								under[si] = 9 -- rainforest
+							end
+						else -- fissure
+							stable[si] = 0
+							under[si] = 0
+						end
+					elseif y >= YWAT - bergdep and y <= YWAT + bergdep / 8 -- icesheet
+					and n_temp < ICETET and density < tstone
+					and math.abs(n_fissure) > 0.01 then
+						data[vi] = c_ice
+						under[si] = 12
+						stable[si] = 0
+					elseif y <= YWAT and density < tstone then -- sea water
+						data[vi] = c_water
+						under[si] = 0
+						stable[si] = 0
+					elseif densitybase >= triver and density < tstone then -- river water not in fissures
+						if n_temp < ICETET then
+							data[vi] = c_wsfreshice
+						else
+							if y == YWAT + 1 then
+								data[vi] = c_wsmixwater
+							else
+								data[vi] = c_wsfreshwater
+							end
+						end
+						stable[si] = 0
+						under[si] = 0
+					elseif densitymid >= tstream and density < tstone then -- stream water not in fissures
+						if n_temp < ICETET then
+							data[vi] = c_wsfreshice
+						else
+							if y == YWAT + 1 then
+								data[vi] = c_wsmixwater
+							else
+								data[vi] = c_wsfreshwater
+							end
+						end
+						stable[si] = 0
+						under[si] = 0
+					elseif density < 0 and y >= YWAT and under[si] ~= 0 then -- air above surface node
+						local fnoise = n_fissure -- noise for flower colours
+						if under[si] == 1 then
+							data[viu] = c_wsicydirt
+							if math.random(flora.DRYCHA) == 2 then
+								data[vi] = c_dryshrub
+							end
+						elseif under[si] == 2 then
+							data[viu] = c_dirtsnow
+							data[vi] = c_snowblock
+						elseif under[si] == 3 then
+							if math.random(flora.PINCHA) == 2 then
+								watershed_pinetree(x, y, z, area, data)
+							else
+								data[viu] = c_dirtsnow
+								data[vi] = c_snowblock
+							end
+						elseif under[si] == 4 then
+							data[viu] = c_wsdrygrass
+							if math.random(flora.DRYCHA) == 2 then
+								data[vi] = c_dryshrub
+							end
+						elseif under[si] == 5 then
+							data[viu] = c_wsgrass
+							if math.random(flora.FLOCHA) == 2 then
+								watershed_flower(data, vi, fnoise)
+							elseif math.random(flora.GRACHA) == 2 then
+								data[vi] = c_grass5
+							end
+						elseif under[si] == 6 then
+							if math.random(flora.APTCHA) == 2 then
+								watershed_appletree(x, y, z, area, data)
+							else
+								data[viu] = c_wsgrass
+								if math.random(flora.FLOCHA) == 2 then
+									watershed_flower(data, vi, fnoise)
+								elseif math.random(flora.GRACHA) == 2 then
+									data[vi] = c_grass5
+								end
+							end
+						elseif under[si] == 7 and n_temp < HITET + 0.1 then
+							if math.random(flora.CACCHA) == 2 then
+								watershed_cactus(x, y, z, area, data)
+							elseif math.random(flora.DRYCHA) == 2 then
+								data[vi] = c_dryshrub
+							end
+						elseif under[si] == 8 then
+							if math.random(flora.ACACHA) == 2 then
+								watershed_acaciatree(x, y, z, area, data)
+							else
+								data[viu] = c_wsdrygrass
+								if math.random(flora.GOGCHA) == 2 then
+									data[vi] = c_wsgoldengrass
+								end
+							end
+						elseif under[si] == 9 then
+							if math.random(flora.JUTCHA) == 2 then
+								watershed_jungletree(x, y, z, area, data)
+							else
+								data[viu] = c_wsgrass
+								if math.random(flora.JUGCHA) == 2 then
+									data[vi] = c_jungrass
+								end
+							end
+						elseif under[si] == 10 then -- dunes
+							if math.random(flora.DUGCHA) == 2 and y > YSAV 
+							and biome >= 4 then
+								data[vi] = c_wsgoldengrass
+							end
+						elseif under[si] == 11 and n_temp > HITET then -- hot biome riverbank
+							if math.random(flora.PAPCHA) == 2 then
+								watershed_papyrus(x, y, z, area, data)
+							end
+						elseif under[si] == 12
+						and n_humid > LOHUT + (math.random() - 0.5) * BLEND then -- snowy iceberg
+							data[vi] = c_snowblock
+						end
+						stable[si] = 0
+						under[si] = 0
+					elseif density < 0 and densitymid > TFOG and n_humid > FOGHUT then -- fog
+						data[vi] = c_wscloud
+						stable[si] = 0
+						under[si] = 0
+					elseif density < 0 and CLOUDS and y == y1 and y >= YCLOMIN then -- clouds
+						local xrq = 16 * math.floor((x - x0) / 16) -- quantise to 16x16 lattice
+						local zrq = 16 * math.floor((z - z0) / 16)
+						local yrq = 79
+						local qixyz = zrq * 6400 + yrq * 80 + xrq + 1 -- quantised 3D index
+						if math.abs(nvals_fissure[qixyz]) < nvals_humid[qixyz] * 0.1 then
+							data[vi] = c_wscloud
+						end
+						stable[si] = 0
+						under[si] = 0
+					else -- air
+						stable[si] = 0
+						under[si] = 0
+					end
+				elseif y == y1 + 1 then -- plane of nodes above chunk
+					if density < 0 and y >= YWAT and under[si] ~= 0 then -- if air above fine materials
+						if under[si] == 1 then -- add surface nodes to chunk top layer
+							data[viu] = c_wsicydirt
+						elseif under[si] == 2 then
+							data[viu] = c_dirtsnow
+							data[vi] = c_snowblock -- snowblocks in chunk above
+						elseif under[si] == 3 then
+							data[viu] = c_dirtsnow
+							data[vi] = c_snowblock
+						elseif under[si] == 4 then
+							data[viu] = c_wsdrygrass
+						elseif under[si] == 5 then
+							data[viu] = c_wsgrass
+						elseif under[si] == 6 then
+							data[viu] = c_wsgrass
+						elseif under[si] == 8 then
+							data[viu] = c_wsdrygrass
+						elseif under[si] == 9 then
+							data[viu] = c_wsgrass
+						end
+					end
+				end
+				nixyz = nixyz + 1 -- increment perlinmap and voxelarea indexes along x row
+				nixz = nixz + 1
+				vi = vi + 1
+				viu = viu + 1
+			end
+			nixz = nixz - sidelen
+		end
+		nixz = nixz + sidelen
+	end
+end
+
+
+-- Regenerate chunk by chat command. Dependant on chunksize = 5.
+
+minetest.register_chatcommand("regen",{
+	description = "Regenerate player's current mapchunk",
+	privs = {server = true, rollback = true},
+	func = function(name, params)
+		local t1 = os.clock()
+
+		local player = minetest.get_player_by_name(name)
+		local pos = player:getpos()
+		local plax = math.floor(pos.x + 0.5)
+		local play = math.floor(pos.y + 0.5)
+		local plaz = math.floor(pos.z + 0.5)
+		local x0 = (80 * math.floor((plax + 32) / 80)) - 32
+		local y0 = (80 * math.floor((play + 32) / 80)) - 32
+		local z0 = (80 * math.floor((plaz + 32) / 80)) - 32
+		local x1 = x0 + 79
+		local y1 = y0 + 79
+		local z1 = z0 + 79
+
+		if y0 < YMIN or y1 > YMAX then
+			return
+		end
+
+		print ("[watershed] regenerate mapchunk")
+
+		local vm = minetest.get_voxel_manip()
+		local pos1 = {x = x0, y = y0 - 1, z = z0}
+		local pos2 = {x = x1, y = y1 + 1, z = z1}
+		local emin, emax = vm:read_from_map(pos1, pos2)
+		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+		local data = vm:get_data()
+
+		watershed_chunkgen(x0, y0, z0, x1, y1, z1, area, data)	
+
+		vm:set_data(data)
+		vm:write_to_map()
+		vm:update_map()
+
+		local chugent = math.ceil((os.clock() - t1) * 1000)
+		print ("[watershed] "..chugent.." ms")
+	end
+})
+
+
+-- On generated function
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	if minp.y < YMIN or maxp.y > YMAX then
+		return
+	end
+
+	local t1 = os.clock()
+
+	local x1 = maxp.x
+	local y1 = maxp.y
+	local z1 = maxp.z
+	local x0 = minp.x
+	local y0 = minp.y
+	local z0 = minp.z
+	
+	print ("[watershed] generate mapchunk minp ("..x0.." "..y0.." "..z0..")")
+
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+	local data = vm:get_data()
+
+	watershed_chunkgen(x0, y0, z0, x1, y1, z1, area, data)
+
+	vm:set_data(data)
+	vm:calc_lighting()
+	vm:write_to_map(data)
+	vm:update_liquids()
+	
+	local chugent = math.ceil((os.clock() - t1) * 1000)
+	print ("[watershed] "..chugent.." ms")
+end)
+

mods/watershed/license.txt

@@ -0,0 +1,14 @@
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
+                       

mods/watershed/nodes.lua

@@ -0,0 +1,647 @@
+minetest.register_node("watershed:appleleaf", {
+	description = "Appletree leaves",
+	drawtype = "allfaces_optional",
+	visual_scale = 1.3,
+	tiles = {"default_leaves.png"},
+	paramtype = "light",
+	is_ground_content = false,
+	groups = {snappy=3, flammable=2, leaves=1},
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {"watershed:appling"},rarity = 20},
+			{items = {"watershed:appleleaf"}}
+		}
+	},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:appling", {
+	description = "Appletree sapling",
+	drawtype = "plantlike",
+	visual_scale = 1.0,
+	tiles = {"default_sapling.png"},
+	inventory_image = "default_sapling.png",
+	wield_image = "default_sapling.png",
+	paramtype = "light",
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.3, -0.5, -0.3, 0.3, 0.35, 0.3}
+	},
+	groups = {snappy=2,dig_immediate=3,flammable=2,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:acaciatree", {
+	description = "Acacia tree",
+	tiles = {"watershed_acaciatreetop.png", "watershed_acaciatreetop.png", "watershed_acaciatree.png"},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {tree=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
+	sounds = default.node_sound_wood_defaults(),
+	on_place = minetest.rotate_node
+})
+
+minetest.register_node("watershed:acacialeaf", {
+	description = "Acacia leaves",
+	drawtype = "allfaces_optional",
+	visual_scale = 1.3,
+	tiles = {"watershed_acacialeaf.png"},
+	paramtype = "light",
+	is_ground_content = false,
+	groups = {snappy=3, flammable=2, leaves=1},
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {"watershed:acacialing"},rarity = 20},
+			{items = {"watershed:acacialeaf"}}
+		}
+	},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:acacialing", {
+	description = "Acacia tree sapling",
+	drawtype = "plantlike",
+	visual_scale = 1.0,
+	tiles = {"watershed_acacialing.png"},
+	inventory_image = "watershed_acacialing.png",
+	wield_image = "watershed_acacialing.png",
+	paramtype = "light",
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.3, -0.5, -0.3, 0.3, 0.35, 0.3}
+	},
+	groups = {snappy=2,dig_immediate=3,flammable=2,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:pinetree", {
+	description = "Pine tree",
+	tiles = {"watershed_pinetreetop.png", "watershed_pinetreetop.png", "watershed_pinetree.png"},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {tree=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
+	sounds = default.node_sound_wood_defaults(),
+	on_place = minetest.rotate_node
+})
+
+minetest.register_node("watershed:needles", {
+	description = "Pine needles",
+	drawtype = "allfaces_optional",
+	visual_scale = 1.3,
+	tiles = {"watershed_needles.png"},
+	paramtype = "light",
+	is_ground_content = false,
+	groups = {snappy=3},
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {"watershed:pineling"},rarity = 20},
+			{items = {"watershed:needles"}}
+		}
+	},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:pineling", {
+	description = "Pine sapling",
+	drawtype = "plantlike",
+	visual_scale = 1.0,
+	tiles = {"watershed_pineling.png"},
+	inventory_image = "watershed_pineling.png",
+	wield_image = "watershed_pineling.png",
+	paramtype = "light",
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.3, -0.5, -0.3, 0.3, 0.35, 0.3}
+	},
+	groups = {snappy=2,dig_immediate=3,flammable=2,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:jungleleaf", {
+	description = "Jungletree leaves",
+	drawtype = "allfaces_optional",
+	visual_scale = 1.3,
+	tiles = {"default_jungleleaves.png"},
+	paramtype = "light",
+	is_ground_content = false,
+	groups = {snappy=3, flammable=2, leaves=1},
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {"watershed:jungling"},rarity = 20},
+			{items = {"watershed:jungleleaf"}}
+		}
+	},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:jungling", {
+	description = "Jungletree sapling",
+	drawtype = "plantlike",
+	visual_scale = 1.0,
+	tiles = {"default_junglesapling.png"},
+	inventory_image = "default_junglesapling.png",
+	wield_image = "default_junglesapling.png",
+	paramtype = "light",
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.3, -0.5, -0.3, 0.3, 0.35, 0.3}
+	},
+	groups = {snappy=2,dig_immediate=3,flammable=2,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("watershed:dirt", {
+	description = "Dirt",
+	tiles = {"default_dirt.png"},
+	is_ground_content = false,
+	groups = {crumbly=3,soil=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults(),
+})
+
+minetest.register_node("watershed:icydirt", {
+	description = "Icy dirt",
+	tiles = {"watershed_icydirt.png"},
+	is_ground_content = false,
+	groups = {crumbly=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_snow_footstep", gain=0.15},
+		dug = {name="default_snow_footstep", gain=0.45},
+	}),
+})
+
+minetest.register_node("watershed:grass", {
+	description = "Grass",
+	tiles = {"default_grass.png", "default_dirt.png", "default_grass.png"},
+	is_ground_content = false,
+	groups = {crumbly=3,soil=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.25},
+	}),
+})
+
+minetest.register_node("watershed:redstone", {
+	description = "Red stone",
+	tiles = {"default_desert_stone.png"},
+	is_ground_content = false,
+	groups = {cracky=3},
+	drop = "watershed:redcobble",
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("watershed:redcobble", {
+	description = "Red cobblestone",
+	tiles = {"watershed_redcobble.png"},
+	is_ground_content = false,
+	groups = {cracky=3, stone=2},
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("watershed:stone", {
+	description = "Stone",
+	tiles = {"default_stone.png"},
+	is_ground_content = false,
+	groups = {cracky=3},
+	drop = "default:cobble",
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("watershed:cactus", {
+	description = "Cactus",
+	tiles = {"default_cactus_top.png", "default_cactus_top.png", "default_cactus_side.png"},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {snappy=1,choppy=3,flammable=2},
+	drop = "default:cactus",
+	sounds = default.node_sound_wood_defaults(),
+	on_place = minetest.rotate_node
+})
+
+minetest.register_node("watershed:goldengrass", {
+	description = "Golden grass",
+	drawtype = "plantlike",
+	tiles = {"watershed_goldengrass.png"},
+	inventory_image = "watershed_goldengrass.png",
+	wield_image = "watershed_goldengrass.png",
+	paramtype = "light",
+	walkable = false,
+	buildable_to = true,
+	is_ground_content = false,
+	groups = {snappy=3,flammable=3,flora=1,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.5, -0.5, -0.5, 0.5, -5/16, 0.5},
+	},
+})
+
+minetest.register_node("watershed:drygrass", {
+	description = "Dry grass",
+	tiles = {"watershed_drygrass.png"},
+	is_ground_content = false,
+	groups = {crumbly=1,soil=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.4},
+	}),
+})
+
+minetest.register_node("watershed:permafrost", {
+	description = "Permafrost",
+	tiles = {"watershed_permafrost.png"},
+	is_ground_content = false,
+	groups = {crumbly=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults(),
+})
+
+minetest.register_node("watershed:vine", {
+	description = "Jungletree vine",
+	drawtype = "airlike",
+	paramtype = "light",
+	walkable = false,
+	climbable = true,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	is_ground_content = false,
+	groups = {not_in_creative_inventory=1},
+})
+
+minetest.register_node("watershed:freshice", {
+	description = "Fresh ice",
+	tiles = {"watershed_freshice.png"},
+	is_ground_content = false,
+	paramtype = "light",
+	groups = {cracky=3},
+	sounds = default.node_sound_glass_defaults(),
+})
+
+minetest.register_node("watershed:cloud", {
+	description = "Cloud",
+	drawtype = "glasslike",
+	tiles = {"watershed_cloud.png"},
+	paramtype = "light",
+	is_ground_content = false,
+	sunlight_propagates = true,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	post_effect_color = {a=23, r=241, g=248, b=255},
+})
+
+minetest.register_node("watershed:luxore", {
+	description = "Lux ore",
+	tiles = {"watershed_luxore.png"},
+	paramtype = "light",
+	light_source = 14,
+	groups = {cracky=3},
+	drop = "watershed:luxcrystal 8",
+	sounds = default.node_sound_glass_defaults(),
+})
+
+minetest.register_node("watershed:light", {
+	description = "Light",
+	tiles = {"watershed_light.png"},
+	paramtype = "light",
+	light_source = 14,
+	groups = {cracky=3},
+	sounds = default.node_sound_glass_defaults(),
+})
+
+minetest.register_node("watershed:acaciawood", {
+	description = "Acacia wood planks",
+	tiles = {"watershed_acaciawood.png"},
+	groups = {choppy=2,oddly_breakable_by_hand=2,flammable=3,wood=1},
+	sounds = default.node_sound_wood_defaults(),
+})
+
+minetest.register_node("watershed:pinewood", {
+	description = "Pine wood planks",
+	tiles = {"watershed_pinewood.png"},
+	groups = {choppy=2,oddly_breakable_by_hand=2,flammable=3,wood=1},
+	sounds = default.node_sound_wood_defaults(),
+})
+
+
+
+minetest.register_node("watershed:freshwater", {
+	description = "Freshwater source",
+	inventory_image = minetest.inventorycube("watershed_freshwater.png"),
+	drawtype = "liquid",
+	tiles = {
+		{
+			name="watershed_freshwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0}
+		}
+	},
+	special_tiles = {
+		{
+			name="watershed_freshwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0},
+			backface_culling = false,
+		}
+	},
+	alpha = WATER_ALPHA,
+	paramtype = "light",
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "source",
+	liquid_alternative_flowing = "watershed:freshwaterflow",
+	liquid_alternative_source = "watershed:freshwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	post_effect_color = {a=64, r=100, g=150, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1},
+})
+
+minetest.register_node("watershed:freshwaterflow", {
+	description = "Flowing freshwater",
+	inventory_image = minetest.inventorycube("watershed_freshwater.png"),
+	drawtype = "flowingliquid",
+	tiles = {"watershed_freshwater.png"},
+	special_tiles = {
+		{
+			image="watershed_freshwaterflowanim.png",
+			backface_culling=false,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+		{
+			image="watershed_freshwaterflowanim.png",
+			backface_culling=true,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+	},
+	alpha = WATER_ALPHA,
+	paramtype = "light",
+	paramtype2 = "flowingliquid",
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "flowing",
+	liquid_alternative_flowing = "watershed:freshwaterflow",
+	liquid_alternative_source = "watershed:freshwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	post_effect_color = {a=64, r=100, g=150, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1, not_in_creative_inventory=1},
+})
+
+minetest.register_node("watershed:lava", {
+	description = "Lava source",
+	inventory_image = minetest.inventorycube("default_lava.png"),
+	drawtype = "liquid",
+	tiles = {
+		{name="default_lava_source_animated.png", animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=3.0}}
+	},
+	special_tiles = {
+		{
+			name="default_lava_source_animated.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=3.0},
+			backface_culling = false,
+		}
+	},
+	paramtype = "light",
+	light_source = 14,
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "source",
+	liquid_alternative_flowing = "watershed:lavaflow",
+	liquid_alternative_source = "watershed:lava",
+	liquid_viscosity = LAVA_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	damage_per_second = 8,
+	post_effect_color = {a=192, r=255, g=64, b=0},
+	groups = {lava=3, liquid=2, hot=3, igniter=1},
+})
+
+minetest.register_node("watershed:lavaflow", {
+	description = "Flowing lava",
+	inventory_image = minetest.inventorycube("default_lava.png"),
+	drawtype = "flowingliquid",
+	tiles = {"default_lava.png"},
+	special_tiles = {
+		{
+			image="default_lava_flowing_animated.png",
+			backface_culling=false,
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=3.3}
+		},
+		{
+			image="default_lava_flowing_animated.png",
+			backface_culling=true,
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=3.3}
+		},
+	},
+	paramtype = "light",
+	paramtype2 = "flowingliquid",
+	light_source = 14,
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "flowing",
+	liquid_alternative_flowing = "watershed:lavaflow",
+	liquid_alternative_source = "watershed:lava",
+	liquid_viscosity = LAVA_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	damage_per_second = 8,
+	post_effect_color = {a=192, r=255, g=64, b=0},
+	groups = {lava=3, liquid=2, hot=3, igniter=1, not_in_creative_inventory=1},
+})
+
+minetest.register_node("watershed:mixwater", {
+	description = "Mixed water source",
+	inventory_image = minetest.inventorycube("watershed_mixwater.png"),
+	drawtype = "liquid",
+	tiles = {
+		{
+			name="watershed_mixwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0}
+		}
+	},
+	special_tiles = {
+		{
+			name="watershed_mixwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0},
+			backface_culling = false,
+		}
+	},
+	alpha = WATER_ALPHA,
+	paramtype = "light",
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "source",
+	liquid_alternative_flowing = "watershed:mixwaterflow",
+	liquid_alternative_source = "watershed:mixwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	post_effect_color = {a=64, r=100, g=120, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1},
+})
+
+minetest.register_node("watershed:mixwaterflow", {
+	description = "Flowing mixed water",
+	inventory_image = minetest.inventorycube("watershed_mixwater.png"),
+	drawtype = "flowingliquid",
+	tiles = {"watershed_mixwater.png"},
+	special_tiles = {
+		{
+			image="watershed_mixwaterflowanim.png",
+			backface_culling=false,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+		{
+			image="watershed_mixwaterflowanim.png",
+			backface_culling=true,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+	},
+	alpha = WATER_ALPHA,
+	paramtype = "light",
+	paramtype2 = "flowingliquid",
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "flowing",
+	liquid_alternative_flowing = "watershed:mixwaterflow",
+	liquid_alternative_source = "watershed:mixwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	post_effect_color = {a=64, r=100, g=120, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1, not_in_creative_inventory=1},
+})
+
+-- Items
+
+minetest.register_craftitem("watershed:luxcrystal", {
+	description = "Lux crystal",
+	inventory_image = "watershed_luxcrystal.png",
+})
+
+-- Crafting
+
+minetest.register_craft({
+	type = "cooking",
+	output = "default:desert_stone",
+	recipe = "watershed:redcobble",
+})
+
+minetest.register_craft({
+    output = "watershed:light 8",
+    recipe = {
+        {"default:glass", "default:glass", "default:glass"},
+        {"default:glass", "watershed:luxcrystal", "default:glass"},
+        {"default:glass", "default:glass", "default:glass"},
+    },
+})
+
+minetest.register_craft({
+	output = "watershed:acaciawood 4",
+	recipe = {
+		{"watershed:acaciatree"},
+	}
+})
+
+minetest.register_craft({
+	output = "watershed:pinewood 4",
+	recipe = {
+		{"watershed:pinetree"},
+	}
+})
+
+-- Buckets
+
+bucket.register_liquid(
+	"watershed:freshwater",
+	"watershed:freshwaterflow",
+	"watershed:bucket_freshwater",
+	"watershed_bucketfreshwater.png",
+	"WS Fresh Water Bucket"
+)
+
+bucket.register_liquid(
+	"watershed:lava",
+	"watershed:lavaflow",
+	"watershed:bucket_lava",
+	"bucket_lava.png",
+	"WS Lava Bucket"
+)
+
+-- Fuel
+
+minetest.register_craft({
+	type = "fuel",
+	recipe = "watershed:bucket_lava",
+	burntime = 60,
+	replacements = {{"watershed:bucket_lava", "bucket:bucket_empty"}},
+})
+
+-- Register stairs and slabs
+
+stairs.register_stair_and_slab("acaciawood", "watershed:acaciawood",
+		{snappy=2,choppy=2,oddly_breakable_by_hand=2,flammable=3},
+		{"watershed_acaciawood.png"},
+		"Acaciawood stair",
+		"Acaciawood slab",
+		default.node_sound_wood_defaults())
+
+stairs.register_stair_and_slab("pinewood", "watershed:pinewood",
+		{snappy=2,choppy=2,oddly_breakable_by_hand=2,flammable=3},
+		{"watershed_pinewood.png"},
+		"Pinewood stair",
+		"Pinewood slab",
+		default.node_sound_wood_defaults())