Editor Tool Utilities – Perlin Noise

local perlin = require('editor/toolUtilities/perlin')

-- Sample noise at a single point
local value = perlin.noise(10.5, 20.3)

-- Generate a noise heightmap for terrain variation
local width, height = 128, 128
local scale = 0.05
for y = 0, height - 1 do
  for x = 0, width - 1 do
    local n = perlin.noise(x * scale, y * scale)
    local normalised = (n + 1) * 0.5  -- map to [0, 1]
    -- Use normalised value for terrain offset, texture blending, etc.
  end
end

-- Multi-octave fractal noise (manual layering)
local function fbm(x, y, octaves, lacunarity, gain)
  local sum, amp, freq = 0, 1, 1
  for i = 1, octaves do
    sum = sum + perlin.noise(x * freq, y * freq) * amp
    freq = freq * lacunarity
    amp = amp * gain
  end
  return sum
end

local value = fbm(50.0, 75.0, 4, 2.0, 0.5)