createCanvas(windowWidth, windowHeight);

  noiseDetail(random(1, 99));

  noiseSeed(random(1, 99));

  loadPixels();

  for (let x = 0; x < width; x++) {

    for (let y = 0; y < height; y++) {

      let index = (x + y * width) * 4;

      let c = noise(x * y * 0.002) * 255;

      pixels[index] = c;

      pixels[index + 1] = c;

      pixels[index + 2] = c;

      pixels[index + 3] = 255;

    }

  }

  updatePixels();

}

​