Noise # A common way to generate 2D maps is to use a bandwidth-limited noise function, such as Simplex or Perlin noise, as a building block. Since noise can go from 0 to 1, the sum 1 * noise() + 0.5 * noise() + 0.25 * noise() can go from 0 to 1.75. Let’s create a second noise map for “moisture”: Elevation noise on left; moisture noise on right Now let’s use both elevation and moisture. It might also be interesting to mix ridged low frequency noise with non-ridged high frequency noise. For this simple project it doesn’t matter that much whether you use Simplex noise, OpenSimplex noise, Perlin noise, value noise, midpoint displacement, diamond square[21] displacement, or an inverse Fourier transform.