function setup() {

  createCanvas(400, 400);

  loadPixels();

  let xoff = 0.0;

  for (let x = 0; x < width; x++) {

    let yoff = 0.0;

    for (let y = 0; y < height*2; y++) {

      const bright = map(noise(xoff, yoff, t ), 0, 1, 0, 255);

​

      let index = (x + y * width * 2) * 4

      pixels[index] = 124;

      pixels[index + 1] = bright;

      pixels[index + 2] = bright;

      pixels[index + 3] = 255;

     set(x, y, floor(bright))

      yoff += 0.01;

    } // for y

    xoff += 0.01;

  } // for x

  updatePixels();

} // setup

​

function draw() {

t++;

}