commit 06b646925c64c85f7eea63286cb122a4eb40bf9a
Author: paramat <mat.gregory@virginmedia.com>
Date:   Fri Feb 21 09:13:02 2014 +0000

    First commit

diff --git a/README.txt b/README.txt
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+noise23 0.1.1 by paramat
+For latest stable Minetest back to 0.4.8
+Depends default
+Licenses: code WTFPL
+
+Enable fly, teleport to y = 7000 then fly up or down to find the surface.
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diff --git a/depends.txt b/depends.txt
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+default
diff --git a/init.lua b/init.lua
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+-- noise23 0.1.1 by paramat
+-- For latest stable Minetest and back to 0.4.8
+-- Depends default
+-- License: code WTFPL
+
+-- Parameters
+
+local YMIN = 6000
+local YMAX = 8000
+local TERCEN = 7000 -- Terrain centre. Average terrain level
+local YWATER = 7000 -- Approximate water surface y, is rounded down to near base of chunk
+local TERSCA = 128 -- Terrain scale in nodes, typical height of mountains
+local TSTONE = 0.04 -- Density threshold for stone, depth of stone below surface
+local STABLE = 2 -- Minimum number of stacked stone nodes in column required to support sand
+
+-- 3D noise for terrain
+
+local np_terrain = {
+	offset = 0,
+	scale = 1,
+	spread = {x=512, y=256, z=512}, -- squashed perlin noise, y spread is half
+	seed = 5900033,
+	octaves = 6,
+	persist = 0.67
+}
+
+-- 2D noise for biomes
+
+local np_biome = {
+	offset = 0,
+	scale = 1,
+	spread = {x=512, y=512, z=512}, -- spread is still stated with xyz values
+	seed = -188900,
+	octaves = 4,
+	persist = 0.5
+}
+
+-- Stuff
+
+noise23 = {}
+
+waty = (80 * math.floor((WATY + 32) / 80)) - 32 + 15 -- sets water surface to 16 nodes above chunk base
+
+-- Nodes
+
+minetest.register_node("noise23:flosand", {
+	description = "Turquoise Float Sand",
+	tiles = {"noise23_flosand.png"},
+	groups = {crumbly=3, falling_node=1},
+	sounds = default.node_sound_sand_defaults(),
+})
+
+minetest.register_node("noise23:stone", {
+	description = "N23 Stone",
+	tiles = {"default_stone.png"},
+	groups = {cracky=3},
+	drop = "default:stone",
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("noise23:desertstone", {
+	description = "N23 Desert Stone",
+	tiles = {"default_desert_stone.png"},
+	groups = {cracky=3},
+	drop = "default:desert_stone",
+	sounds = default.node_sound_stone_defaults(),
+})
+
+-- 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 ("[noise23] chunk 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()
+	
+	local c_air = minetest.get_content_id("air")
+	local c_n23stone = minetest.get_content_id("noise23:stone")
+	local c_n23destone = minetest.get_content_id("noise23:desertstone")
+	local c_sand = minetest.get_content_id("default:sand")
+	local c_desand = minetest.get_content_id("default:desert_sand")
+	local c_flosand = minetest.get_content_id("noise23:flosand")
+	local c_water = minetest.get_content_id("default:water_source")
+	
+	local sidelen = x1 - x0 + 1
+	local chulens = {x=sidelen, y=sidelen, z=sidelen}
+	local minposxyz = {x=x0, y=y0, z=z0}
+	local minposxz = {x=x0, y=z0}
+	
+	local nvals_terrain = minetest.get_perlin_map(np_terrain, chulens):get3dMap_flat(minposxyz)
+	local nvals_biome = minetest.get_perlin_map(np_biome, chulens):get2dMap_flat(minposxz)
+	
+	local nixyz = 1 -- 3D noise index
+	local nixz = 1 -- 2D noise index
+	local stable = {}
+	for z = z0, z1 do -- for each xy plane progressing northwards
+		for x = x0, x1 do
+			local si = x - x0 + 1
+			local nodename = minetest.get_node({x=x,y=y0-1,z=z}).name
+			if nodename == "air"
+			or nodename == "default:water_source" then
+				stable[si] = 0
+			else
+				stable[si] = STABLE
+			end
+		end
+		for y = y0, y1 do -- for each x row progressing upwards
+			local vi = area:index(x0, y, z)
+			for x = x0, x1 do -- for each node do
+				local si = x - x0 + 1
+				local grad = (TCEN - y) / GRAD
+				local density = nvals_terrain[nixyz] + grad
+				local n_biome = nvals_biome[nixz] -- biome noise for node
+				local biome = false -- set biome id to undefined
+				if n_biome > 0.46 + math.random() * 0.04 then -- set biome id
+					biome = 3
+				elseif n_biome < -0.5 + math.random() * 0.04 then
+					biome = 1
+				else
+					biome = 2
+				end
+				if density >= STOT then
+					if biome == 3 then
+						data[vi] = c_n23destone
+					else -- biomes 1 and 2
+						data[vi] = c_n23stone
+					end
+					stable[si] = stable[si] + 1
+				elseif density >= 0 and density < STOT and stable[si] >= 2 then
+					if biome == 3 then
+						data[vi] = c_desand
+					elseif biome == 1 then
+						data[vi] = c_flosand
+					else -- biome = 2
+						data[vi] = c_sand
+					end
+				elseif y <= waty then
+					data[vi] = c_water
+					stable[si] = 0
+				else
+					data[vi] = c_air
+					stable[si] = 0
+				end
+				nixyz = nixyz + 1 -- increment 3D noise index
+				nixz = nixz + 1 -- increment 2D noise index
+				vi = vi + 1
+			end
+			nixz = nixz - 80 -- rewind 2D noise index by 80 nodes for next x row above
+		end
+		nixz = nixz + 80 -- fast-forward 2D noise index by 80 nodes for next northward xy plane
+	end
+	
+	vm:set_data(data)
+	vm:set_lighting({day=0, night=0})
+	vm:calc_lighting()
+	vm:write_to_map(data)
+	local chugent = math.ceil((os.clock() - t1) * 1000)
+	print ("[noise23] "..chugent.." ms")
+end)
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diff --git a/license.txt b/license.txt
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+            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.
+                       
diff --git a/textures/noise23_flosand.png b/textures/noise23_flosand.png
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