mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-06-03 05:03:02 +00:00
39 lines
1.7 KiB
Lua
39 lines
1.7 KiB
Lua
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--- Applies the given noise field to the given heightmap.
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-- Mutates the given heightmap.
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-- @param heightmap number[] A table of ZERO indexed numbers representing the heghtmap - see worldeditadditions.make_heightmap().
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-- @param noise number[] An table identical in structure to the heightmap containing the noise values to apply.
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-- @param heightmap_size {x:number,z:number} A 2d vector representing the size of the heightmap.
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-- @param region_height number The height of the defined region.
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-- @param apply_mode string The apply mode to use to apply the noise to the heightmap.
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-- @returns bool[,string] A boolean value representing whether the application was successful or not. If false, then an error message as a string is also returned describing the error that occurred.
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function worldeditadditions.noise.apply_2d(heightmap, noise, heightmap_size, region_height, apply_mode)
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if type(apply_mode) ~= "string" then
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return false, "Error: Expected string value for apply_mode, but received value of type "..type(apply_mode)
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end
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local percent = tonumber(apply_mode:match("^(%d+)%%$"))
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for z = heightmap_size.z - 1, 0, -1 do
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for x = heightmap_size.x - 1, 0, -1 do
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local i = (z * heightmap_size.x) + x
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if apply_mode == "add" then
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heightmap[i] = heightmap[i] + noise[i]
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elseif apply_mode == "multiply" then
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heightmap[i] = heightmap[i] * noise[i]
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elseif percent then
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-- Rescale from 0 - 1 to -1 - +1
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local rescaled = (noise[i] * 2) - 1
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-- Rescale to match the percentage specified
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rescaled = rescaled * region_height * percent
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heightmap[i] = rescaled
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else
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return false, "Error: Unknown apply mode '"..apply_mode.."'"
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end
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end
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end
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return true
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end
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