mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-14 04:03:00 +00:00
60 lines
2.9 KiB
Lua
60 lines
2.9 KiB
Lua
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-- ███ ███ █████ ██ ██ ███████ ██████ ██████
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-- ████ ████ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ████ ██ ███████ █████ █████ █████ ██ ██
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ██ ██ ██ ██ ███████ ███████ ███████ ██████
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local wea = worldeditadditions
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-- Generate a flat array of 2D noise.
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-- Written with help from https://www.redblobgames.com/maps/terrain-from-noise/
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-- @param size Vector An x/y vector representing the size of the noise area to generate.
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-- @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.
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function worldeditadditions.noise.make_2d(size, start_pos, params)
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local result = {}
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for layer_i, layer in ipairs(params) do
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local generator
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if layer.algorithm == "perlin" then
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generator = wea.noise.engines.Perlin.new()
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elseif layer.algorithm == "sin" then
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generator = wea.noise.engines.Sin.new()
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elseif layer.algorithm == "white" then
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generator = wea.noise.engines.White.new()
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elseif layer.algorithm == "red" then
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generator = wea.noise.engines.Red.new()
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elseif layer.algorithm == "infrared" then
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generator = wea.noise.engines.Infrared.new()
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else -- We don't have any other generators just yet
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return false, "Error: Unknown noise algorithm '"..tostring(layer.algorithm).."' in layer "..layer_i.." of "..#params.." (available algorithms: "..table.concat(wea.noise.engines.available, ", ")..")."
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end
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-- TODO: Optimise performance by making i count backwards in sequence
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for x = 0, size.x - 1 do
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for y = 0, size.z - 1 do
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local i = y*size.x + x
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local noise_x = (x + 100000+start_pos.x+layer.offset.x) * layer.scale.x
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local noise_y = (y + 100000+start_pos.z+layer.offset.z) * layer.scale.z
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local noise_value = generator:noise(noise_x, noise_y, 0)
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if type(result[i]) ~= "number" then result[i] = 0 end
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local result_before = result[i]
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result[i] = result[i] + (noise_value ^ layer.exponent) * layer.multiply + layer.add
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-- if layer_i == 1 and result[i] > 1 then
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-- print("NOISE TOO BIG noise_value", noise_value, "noise_x", noise_x, "noise_y", noise_y, "i", i, "result[i]: BEFORE", result_before, "AFTER", result[i])
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-- end
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end
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end
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end
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print("NOISE MAKE_2D\n")
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worldeditadditions.format.array_2d(result, size.x)
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-- We don't round here, because otherwise when we apply it it'll be inaccurate
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return true, result
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end
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