mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-12-04 21:13:50 +01:00
63 lines
2.2 KiB
Lua
63 lines
2.2 KiB
Lua
local wea = worldeditadditions
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local wea_c = worldeditadditions_core
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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 wea_c.terrain.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 wea.noise.apply_2d(heightmap, noise, heightmap_size, pos1, pos2, apply_mode)
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if type(apply_mode) ~= "string" and type(apply_mode) ~= "number" then
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return false, "Error: Expected value of type string or number for apply_mode, but received value of type "..type(apply_mode)
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end
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local region_height = pos2.y - pos1.y
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-- print("NOISE APPLY_2D\n")
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wea_c.format.array_2d(noise, heightmap_size.x)
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local height = tonumber(apply_mode)
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-- print("DEBUG apply_mode", apply_mode, "as height", height)
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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] = wea_c.round(heightmap[i] + noise[i])
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elseif apply_mode == "multiply" then
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heightmap[i] = wea_c.round(heightmap[i] * noise[i])
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elseif height 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 height specified
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rescaled = rescaled * height
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rescaled = math.floor(wea_c.clamp(
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heightmap[i] + rescaled,
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0, region_height
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))
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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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-- for z = heightmap_size.z - 1, 0, -1 do
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-- x = 0
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-- heightmap[(z * heightmap_size.x) + x] = z
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-- end
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-- print("HEIGHTMAP\n")
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-- wea_c.format.array_2d(heightmap, heightmap_size.x)
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return true
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end
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