mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-12-02 20:13:54 +01:00
45 lines
2.1 KiB
Lua
45 lines
2.1 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 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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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 "..i.." of "..#params.." (available algorithms: perlin)."
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end
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for x = 0, size.x do
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for y = 0, size.z 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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result[i] = result[i] + (noise_value ^ layer.exponent) * layer.multiply + layer.add
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end
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end
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end
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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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