//noise2d works!

...just.

Next up more engines and documentation

worldeditadditions/init.lua

@@ -44,6 +44,7 @@ dofile(worldeditadditions.modpath.."/lib/scale_down.lua")
 dofile(worldeditadditions.modpath.."/lib/scale.lua")
 dofile(worldeditadditions.modpath.."/lib/conv/conv.lua")
 dofile(worldeditadditions.modpath.."/lib/erode/erode.lua")
+dofile(worldeditadditions.modpath.."/lib/noise/init.lua")
 
 dofile(worldeditadditions.modpath.."/lib/count.lua")
 

worldeditadditions/lib/noise/apply_2d.lua

@@ -29,7 +29,7 @@ function worldeditadditions.noise.apply_2d(heightmap, noise, heightmap_size, reg
 				rescaled = rescaled * region_height * percent
 				heightmap[i] = rescaled
 			else
-				return false, "Error: Unknown apply_mode '"..apply_mode.."'"
+				return false, "Error: Unknown apply mode '"..apply_mode.."'"
 			end
 		end
 	end

worldeditadditions/lib/noise/engines/perlin.lua

@@ -1,31 +1,5 @@
 local wea = worldeditadditions
 
-
-local function BitAND(a, b) --Bitwise and
-	local p, c = 1, 0
-	while a > 0 and b > 0 do
-		local ra, rb = a%2, b%2
-		if ra + rb > 1 then c = c + p end
-		a, b, p = (a - ra) / 2, (b - rb) / 2, p * 2
-	end
-	return c
-end
-
-local function fade(t)
-	return t * t * t * (t * (t * 6 - 15) + 10)
-end
-
-local function lerp(t, a, b)
-	return a + t * (b - a)
-end
-
-local function grad(hash, x, y, z)
-	local h = BitAND(hash, 15)
-	local u = h < 8 and x or y
-	local v = h < 4 and y or ((h == 12 or h == 14) and x or z)
-	return ((h and 1) == 0 and u or - u) + ((h and 2) == 0 and v or - v)
-end
-
 --- Perlin noise generation engine.
 -- Original code by Ken Perlin: http://mrl.nyu.edu/~perlin/noise/
 -- Port from this StackOverflow answer: https://stackoverflow.com/a/33425812/1460422
@@ -71,42 +45,107 @@ end
 -- yourself.
 function Perlin:load()
 	for i = 1, self.size do
-		self.p[i] = self.permutation[i]
+		self.p[i - 1] = self.permutation[i]
-		self.p[255 + i] = self.p[i]
+		self.p[i + 255] = self.permutation[i]
 	end
 end
 
+--- Formats a key-value table of values as a string.
+-- @param	map		table	The table of key-value pairs to format.
+-- @returns	string	The given table of key-value pairs formatted as a string.
+local function format_map(map)
+	local result = {}
+	for key, value in pairs(map) do
+		table.insert(result, key.."\t"..tostring(value))
+	end
+	return table.concat(result, "\n")
+end
+
+
 --- Returns a noise value for a given point in 3D space.
 -- @param	x	number	The x co-ordinate.
 -- @param	y	number	The y co-ordinate.
 -- @param	z	number	The z co-ordinate.
 -- @returns	number		The calculated noise value.
 function Perlin:noise( x, y, z )
-	local X = BitAND(math.floor(x), 255) + 1
+	y = y or 0
-	local Y = BitAND(math.floor(y), 255) + 1
+	z = z or 0
-	local Z = BitAND(math.floor(z), 255) + 1
+	local xi = self:BitAND(math.floor(x), 255)
-
+	local yi = self:BitAND(math.floor(y), 255)
+	local zi = self:BitAND(math.floor(z), 255)
+	
+	-- print("x", x, "y", y, "z", z, "xi", xi, "yi", yi, "zi", zi)
+	-- print("p[xi]", self.p[xi])
 	x = x - math.floor(x)
 	y = y - math.floor(y)
 	z = z - math.floor(z)
-	local u = fade(x)
+	local u = self:fade(x)
-	local v = fade(y)
+	local v = self:fade(y)
-	local w = fade(z)
+	local w = self:fade(z)
-	local A = self.p[X] + Y
+	local A = self.p[xi] + yi
-	local AA = self.p[A] + Z
+	local AA = self.p[A] + zi
-	local AB = self.p[A + 1] + Z
+	local AB = self.p[A + 1] + zi
-	local B = self.p[X + 1] + Y
+	local AAA = self.p[AA]
-	local BA = self.p[B] + Z
+	local ABA = self.p[AB]
-	local BB = self.p[B + 1] + Z
+	local AAB = self.p[AA + 1]
-
+	local ABB = self.p[AB + 1]
-	return lerp(w, lerp(v, lerp(u, grad(self.p[AA ], x, y, z ),
+	
-		grad(self.p[BA ], x - 1, y, z )),
+	local B = self.p[xi + 1] + yi
-		lerp(u, grad(self.p[AB ], x, y - 1, z ),
+	local BA = self.p[B] + zi
-	grad(self.p[BB ], x - 1, y - 1, z ))),
+	local BB = self.p[B + 1] + zi
-	lerp(v, lerp(u, grad(self.p[AA + 1], x, y, z - 1),
+	local BAA = self.p[BA]
-		grad(self.p[BA + 1], x - 1, y, z - 1)),
+	local BBA = self.p[BB]
-		lerp(u, grad(self.p[AB + 1], x, y - 1, z - 1),
+	local BAB = self.p[BA + 1]
-	grad(self.p[BB + 1], x - 1, y - 1, z - 1))))
+	local BBB = self.p[BB + 1]
+	
+	-- Add 0.5 to rescale to 0 - 1 instead of -0.5 - +0.5
+	return 0.5 + self:lerp(w,
+		self:lerp(v,
+			self:lerp(u,
+				self:grad(AAA,x,y,z),
+				self:grad(BAA,x-1,y,z)
+			),
+			self:lerp(u,
+				self:grad(ABA,x,y-1,z),
+				self:grad(BBA,x-1,y-1,z)
+			)
+		),
+		self:lerp(v,
+			self:lerp(u,
+				self:grad(AAB,x,y,z-1), self:grad(BAB,x-1,y,z-1)
+			),
+			self:lerp(u,
+				self:grad(ABB,x,y-1,z-1), self:grad(BBB,x-1,y-1,z-1)
+			)
+		)
+	)
 end
 
+
+function Perlin:BitAND(a, b) --Bitwise and
+	local p, c = 1, 0
+	while a > 0 and b > 0 do
+		local ra, rb = a%2, b%2
+		if ra + rb > 1 then c = c + p end
+		a, b, p = (a - ra) / 2, (b - rb) / 2, p * 2
+	end
+	return c
+end
+
+function Perlin:fade(t)
+	return t * t * t * (t * (t * 6 - 15) + 10)
+end
+
+function Perlin:lerp(t, a, b)
+	return a + t * (b - a)
+end
+
+function Perlin:grad(hash, x, y, z)
+	local h = self:BitAND(hash, 15)
+	local u = h < 8 and x or y
+	local v = h < 4 and y or ((h == 12 or h == 14) and x or z)
+	return ((h and 1) == 0 and u or - u) + ((h and 2) == 0 and v or - v)
+end
+
+
 return Perlin

worldeditadditions/lib/noise/engines/perlin_test.lua

@@ -0,0 +1,70 @@
+local Perlin = require("perlin")
+
+--- Pads str to length len with char from left
+-- Adapted from the above
+local function str_padstart(str, len, char)
+	if char == nil then char = ' ' end
+	return string.rep(char, len - #str) .. str
+end
+local function array_2d(tbl, width)
+	print("==== count: "..(#tbl+1)..", width:"..width.." ====")
+	local display_width = 1
+	for _i,value in pairs(tbl) do
+		display_width = math.max(display_width, #tostring(value))
+	end
+	display_width = display_width + 2
+	local next = {}
+	for i=0, #tbl do
+		table.insert(next, str_padstart(tostring(tbl[i]), display_width))
+		if #next == width then
+			print(table.concat(next, ""))
+			next = {}
+		end
+	end
+end
+
+
+--- Finds the minimum value in the given list.
+-- @param	list	number[]	The list (table) of numbers to find the minimum value of.
+-- @returns	number	The minimum value in the given list.
+function min(list)
+	if #list == 0 then return nil end
+	local min = nil
+	for i,value in ipairs(list) do
+		if min == nil or min > value then
+			min = value
+		end
+	end
+	return min
+end
+
+--- Finds the maximum value in the given list.
+-- @param	list	number[]	The list (table) of numbers to find the maximum value of.
+-- @returns	number	The maximum value in the given list.
+function max(list)
+	if #list == 0 then return nil end
+	local max = nil
+	for i,value in ipairs(list) do
+		if max == nil or max < value then
+			max = value
+		end
+	end
+	return max
+end
+
+
+local p = Perlin.new()
+
+local result = {}
+local size = { x = 10, z = 25 }
+
+for x = 0, size.x do
+	for y = 0, size.z do
+		result[y*size.x + x] = p:noise(x, y, 0)
+	end
+end
+
+print(array_2d(result, size.x))
+
+print("MAX ", max(result))
+print("MIN ", min(result))

worldeditadditions/lib/noise/init.lua

@@ -1,12 +1,14 @@
-worldeditadditions.noise = {}
+local wea = worldeditadditions
+
+wea.noise = {}
 
 -- The command itself
-dofile(worldeditadditions.modpath.."/lib/noise/noise2d.lua")
+dofile(wea.modpath.."/lib/noise/run2d.lua")
 
 -- Dependencies
-dofile(worldeditadditions.modpath.."/lib/noise/apply_2d.lua")
+dofile(wea.modpath.."/lib/noise/apply_2d.lua")
-dofile(worldeditadditions.modpath.."/lib/noise/make_2d.lua")
+dofile(wea.modpath.."/lib/noise/make_2d.lua")
-dofile(worldeditadditions.modpath.."/lib/noise/params_apply_default.lua")
+dofile(wea.modpath.."/lib/noise/params_apply_default.lua")
 
 -- Noise generation engines
-dofile(worldeditadditions.modpath.."/lib/noise/engines/perlin.lua")
+wea.noise.Perlin = dofile(wea.modpath.."/lib/noise/engines/perlin.lua")

worldeditadditions/lib/noise/make_2d.lua

@@ -10,25 +10,43 @@
 -- Written with help from https://www.redblobgames.com/maps/terrain-from-noise/
 -- @param	size	Vector	An x/y vector representing the size of the noise area to generate.
 -- @param	params	table|table<table>	A table of noise params to use to generate the noise. Values that aren't specified are filled in automatically. If a table of tables is specified, it is interpreted as multiple octaves of noise to apply in sequence.
-function worldeditadditions.noise.make_2d(size, params)
+function worldeditadditions.noise.make_2d(size, start_pos, params)
 	local result = {}
 	
-	local generator;
+	print("size x", size.x, "z", size.z, "start_pos x", start_pos.x, "z", start_pos.z)
-	if params.algorithm == "perlin" then
+	
-		generator = worldeditadditions.noise.perlin.new()
+	for i, layer in ipairs(params) do
-	else -- We don't have any other generators just yet
+		local generator
-		return false, "Error: Unknown noise algorithm '"..params.."' (available algorithms: perlin)."
+		if layer.algorithm == "perlin" then
+			generator = worldeditadditions.noise.Perlin.new()
+		else -- We don't have any other generators just yet
+			return false, "Error: Unknown noise algorithm '"..tostring(layer.algorithm).."' in layer "..i.." of "..#params.." (available algorithms: perlin)."
+		end
+		
+		for x = 0, size.x do
+			for y = 0, size.z do
+				local i = y*size.x + x
+				
+				local noise_x = (x + 100000+start_pos.x+layer.offset.x) * layer.scale.x
+				local noise_y = (y + 100000+start_pos.z+layer.offset.z) * layer.scale.z
+				local noise_value = generator:noise(noise_x, noise_y, 0)
+				
+				-- print("DEBUG NOISE x", noise_x, "y", noise_y, "value", noise_value)
+				if type(result[i]) ~= "number" then result[i] = 0 end
+				result[i] = result[i] + (noise_value ^ layer.exponent) * layer.multiply + layer.add
+			end
+		end
+		
 	end
 	
-	for x=params.offset.x, params.offset.x+size.x do
+	for x = 0, size.x do
-		for y=params.offset.y, params.offset.y+size.y do
+		for y = 0, size.z do
-			local result = 0
+			local i = y*size.x + x
-			for i,params_octave in ipairs(params) do
+			result[i] = worldeditadditions.round(result[i])
-				result = result + (generator:noise(x * scale.x, y * scale.y, 0) ^ params.exponent) * params.multiply + params.add
-			end
-			result[y*size.x + x] = result
 		end
 	end
 	
-	return result
+	print("NOISE\n", worldeditadditions.format.array_2d(result, size.x))
+	
+	return true, result
 end

worldeditadditions/lib/noise/params_apply_default.lua

@@ -32,9 +32,14 @@ function worldeditadditions.noise.params_apply_default(params)
 	if not params[1] then params = { params } end
 	
 	-- If params[1] is thing, this is a list of params
-	-- This might be a thing if we're dealingw ith multiple octaves
+	-- This might be a thing if we're dealing with multiple octaves
 	for i,params_el in ipairs(params) do
 		local default_copy = worldeditadditions.table.shallowcopy(params_default)
+		
+		-- Keyword support
+		if params_el.perlin then params_el.algorithm = "perlin" end
+		print("DEBUG params_el type", type(params_el), "RAW", params_el)
+		-- Apply this table to fill in the gaps
 		worldeditadditions.table.apply(
 			params_el,
 			default_copy

worldeditadditions/lib/noise/run2d.lua

@@ -11,14 +11,15 @@ local wea = worldeditadditions
 --- Applies a layer of 2d noise over the terrain in the defined region.
 -- @param	pos1			Vector	pos1 of the defined region
 -- @param	pos2			Vector	pos2 of the defined region
--- @param	noise_params	table	A noise parameters table. Will be passed unmodified to PerlinNoise() from the Minetest API.
+-- @param	noise_params	table	A noise parameters table.
-function worldeditadditions.noise.noise2d(pos1, pos2, noise_params)
+function worldeditadditions.noise.run2d(pos1, pos2, noise_params)
 	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
 	local region_height = pos1.y - pos2.y
 	-- pos2 will always have the highest co-ordinates now
 	
 	-- Fill in the default params
 	noise_params = worldeditadditions.noise.params_apply_default(noise_params)
+	print("DEBUG noise_params[1] ", wea.format.map(noise_params[1]))
 	
 	-- Fetch the nodes in the specified area
 	local manip, area = worldedit.manip_helpers.init(pos1, pos2)
@@ -31,15 +32,22 @@ function worldeditadditions.noise.noise2d(pos1, pos2, noise_params)
 	)
 	local heightmap_new = worldeditadditions.table.shallowcopy(heightmap_old)
 	
-	local noisemap = wea.noise.make_2d(noise_params, heightmap_size)
+	local success, noisemap = wea.noise.make_2d(
+		heightmap_size,
+		pos1,
+		noise_params)
+	if not success then return success, noisemap end
 	
-	wea.noise.apply_2d(
+	success, message = wea.noise.apply_2d(
 		heightmap_new,
 		noisemap,
 		heightmap_size,
 		region_height,
-		noise_params.apply
+		noise_params[1].apply
 	)
+	print("RETURNED apply_2d success", success, "message", message)
+	if not success then return success, message end
+	
 	
 	local success, stats = wea.apply_heightmap_changes(
 		pos1, pos2,

worldeditadditions/utils/parse/map.lua

@@ -13,7 +13,7 @@ function worldeditadditions.parse.map(params_text)
 		if i % 2 == 0 then -- Lua starts at 1 :-/
 			-- Try converting to a number to see if it works
 			local part_converted = tonumber(part)
-			if as_number == nil then part_converted = part end
+			if part_converted == nil then part_converted = part end
 			-- Look for bools
 			if part_converted == "true" then part_converted = true end
 			if part_converted == "false" then part_converted = false end

worldeditadditions_commands/commands/noise2d.lua

@@ -0,0 +1,51 @@
+
+local wea = worldeditadditions
+
+worldedit.register_command("noise2d", {
+	params = "[<key_1> [<value_1>]] [<key_2> [<value_2>]] ...]",
+	description = "Applies 2d random noise to the terrain as a 2d heightmap in the defined region. Optionally takes an arbitrary set of key - value pairs representing parameters that control the properties of the noise and how it's applied. See the full documentation for details of these parameters and what they do.",
+	privs = { worldedit = true },
+	require_pos = 2,
+	parse = function(params_text)
+		if not params_text then return true, {} end
+		params_text = wea.trim(params_text)
+		if params_text == "" then return true, {} end
+		
+		
+		local success, map = worldeditadditions.parse.map(params_text)
+		if not success then return success, map end
+		
+		if map.scale then
+			map.scale = tonumber(map.scale)
+			map.scale = wea.Vector3.new(map.scale, map.scale, map.scale)
+		elseif map.scalex or map.scaley or map.scalez then
+			map.scalex = tonumber(map.scalex) or 0
+			map.scaley = tonumber(map.scaley) or 0
+			map.scalez = tonumber(map.scalez) or 0
+			map.scale = wea.Vector3.new(map.scalex, map.scaley, map.scalez)
+		end
+		if map.offsetx or map.offsety or map.offsetz then
+			map.offsetx = tonumber(map.offsetx) or 0
+			map.offsety = tonumber(map.offsety) or 0
+			map.offsetz = tonumber(map.offsetz) or 0
+			map.offset = wea.Vector3.new(map.offsetx, map.offsety, map.offsetz)
+		end
+		
+		return true, map
+	end,
+	nodes_needed = function(name)
+		return worldedit.volume(worldedit.pos1[name], worldedit.pos2[name])
+	end,
+	func = function(name, params)
+		local start_time = worldeditadditions.get_ms_time()
+		local success, stats = worldeditadditions.noise.run2d(
+			worldedit.pos1[name], worldedit.pos2[name],
+			params
+		)
+		if not success then return success, stats end
+		local time_taken = worldeditadditions.get_ms_time() - start_time
+		
+		minetest.log("action", name .. " used //noise2d at " .. worldeditadditions.vector.tostring(worldedit.pos1[name]) .. ", adding " .. stats.added .. " nodes and removing " .. stats.removed .. " nodes in " .. time_taken .. "s")
+		return true, stats.added .. " nodes added and " .. stats.removed .. " nodes removed in " .. worldeditadditions.format.human_time(time_taken)
+	end
+})

worldeditadditions_commands/init.lua

@@ -28,6 +28,7 @@ dofile(we_c.modpath.."/commands/hollow.lua")
 dofile(we_c.modpath.."/commands/layers.lua")
 dofile(we_c.modpath.."/commands/line.lua")
 dofile(we_c.modpath.."/commands/maze.lua")
+dofile(we_c.modpath.."/commands/noise2d.lua")
 dofile(we_c.modpath.."/commands/overlay.lua")
 dofile(we_c.modpath.."/commands/replacemix.lua")
 dofile(we_c.modpath.."/commands/scale.lua")