ComfyFactorio/maps/stone_maze/noise.lua

local simplex_noise = require 'utils.simplex_noise'.d2

local noises = {
    ['trees_01'] = {{modifier = 0.03, weight = 1}, {modifier = 0.05, weight = 0.3}, {modifier = 0.1, weight = 0.05}},
    ['scrap_01'] = {{modifier = 0.04, weight = 1}, {modifier = 0.06, weight = 0.3}, {modifier = 0.08, weight = 0.1}}
}

local function get_noise(name, pos, seed)
    local noise = 0
    local x = pos.x
    local y = pos.y
    if not x then
        x = pos[1]
    end
    if not y then
        y = pos[2]
    end
    for _, n in pairs(noises[name]) do
        noise = noise + simplex_noise(x * n.modifier, y * n.modifier, seed) * n.weight
        seed = seed + 10000
    end
    return noise
end

return get_noise