Minetest-WorldEditAdditions/worldeditadditions/lib/noise/make_2d.lua
Starbeamrainbowlabs b2eb76d280
//noise2d works!
...just.

Next up more engines and documentation
2021-07-03 22:53:16 +01:00

53 lines
2.3 KiB
Lua

-- ███ ███ █████ ██ ██ ███████ ██████ ██████
-- ████ ████ ██ ██ ██ ██ ██ ██ ██ ██
-- ██ ████ ██ ███████ █████ █████ █████ ██ ██
-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
-- ██ ██ ██ ██ ██ ██ ███████ ███████ ███████ ██████
-- Generate a flat array of 2D noise.
-- Written with help from https://www.redblobgames.com/maps/terrain-from-noise/
-- @param size Vector An x/y vector representing the size of the noise area to generate.
-- @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.
function worldeditadditions.noise.make_2d(size, start_pos, params)
local result = {}
print("size x", size.x, "z", size.z, "start_pos x", start_pos.x, "z", start_pos.z)
for i, layer in ipairs(params) do
local generator
if layer.algorithm == "perlin" then
generator = worldeditadditions.noise.Perlin.new()
else -- We don't have any other generators just yet
return false, "Error: Unknown noise algorithm '"..tostring(layer.algorithm).."' in layer "..i.." of "..#params.." (available algorithms: perlin)."
end
for x = 0, size.x do
for y = 0, size.z do
local i = y*size.x + x
local noise_x = (x + 100000+start_pos.x+layer.offset.x) * layer.scale.x
local noise_y = (y + 100000+start_pos.z+layer.offset.z) * layer.scale.z
local noise_value = generator:noise(noise_x, noise_y, 0)
-- print("DEBUG NOISE x", noise_x, "y", noise_y, "value", noise_value)
if type(result[i]) ~= "number" then result[i] = 0 end
result[i] = result[i] + (noise_value ^ layer.exponent) * layer.multiply + layer.add
end
end
end
for x = 0, size.x do
for y = 0, size.z do
local i = y*size.x + x
result[i] = worldeditadditions.round(result[i])
end
end
print("NOISE\n", worldeditadditions.format.array_2d(result, size.x))
return true, result
end