Start laying out stuff for our noise experiment, but it isn't hooked up yet and isn't finished.

worldeditadditions/lib/noise/engines.lua

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+function worldeditadditions.noise.engine_perlin_2d(x, y)
+	
+end

worldeditadditions/lib/noise/make_2d.lua

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+
+-- ███    ███  █████  ██   ██ ███████         ██████  ██████
+-- ████  ████ ██   ██ ██  ██  ██                   ██ ██   ██
+-- ██ ████ ██ ███████ █████   █████            █████  ██   ██
+-- ██  ██  ██ ██   ██ ██  ██  ██              ██      ██   ██
+-- ██      ██ ██   ██ ██   ██ ███████ ███████ ███████ ██████
+function worldeditadditions.noise.make_2d(size, noise_func)
+	-- TODO: Follow https://www.redblobgames.com/maps/terrain-from-noise/
+end

worldeditadditions/lib/noise/noise.lua

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+worldeditadditions.noise = {}
+
+dofile(worldeditadditions.modpath.."/lib/noise/alg_perlin.lua")

worldeditadditions/lib/noise/noise2d.lua

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+--- Applies a layer of 2D noise over the terrain in the defined region.
+-- @module worldeditadditions.noise2d
+
+-- ███    ██  ██████  ██ ███████ ███████ ██████  ██████
+-- ████   ██ ██    ██ ██ ██      ██           ██ ██   ██
+-- ██ ██  ██ ██    ██ ██ ███████ █████    █████  ██   ██
+-- ██  ██ ██ ██    ██ ██      ██ ██      ██      ██   ██
+-- ██   ████  ██████  ██ ███████ ███████ ███████ ██████
+--- 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.
+function worldeditadditions.noise2d(pos1, pos2, noise_params)
+	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+	-- pos2 will always have the highest co-ordinates now
+	
+	-- Fetch the nodes in the specified area
+	local manip, area = worldedit.manip_helpers.init(pos1, pos2)
+	local data = manip:get_data()
+	
+	local heightmap_old, heightmap_size = worldeditadditions.make_heightmap(
+		pos1, pos2,
+		manip, area,
+		data
+	)
+	local heightmap_new = worldeditadditions.shallowcopy(heightmap_old)
+	
+	local perlin_map = PerlinNoiseMap(noise_params, heightmap_size)
+	
+	
+	local stats = { added = 0, removed = 0 }
+	
+	-- Save the modified nodes back to disk & return
+	-- No need to save - this function doesn't actually change anything
+	worldedit.manip_helpers.finish(manip, data)
+	
+	return true, stats
+end