polar noise

polor_noise.pde

float dnoise = 0;

void setup() {
  size(300, 300);
  frameRate(30);
}

void draw() {
  background(0);
  
  float ynoise = 0;
  for (int y = 0; y < height; y++) {
    ynoise += 0.01;
    float xnoise = 0;
    for (int x = 0; x < width; x++) {
      xnoise += 0.01;
      int tx = x - width / 2;
      int ty = y - height / 2;
      float d = sqrt(tx * tx + ty * ty) / width;
      float t = 0 <= ty ? acos(tx / d) : 2 * PI - acos(tx / d);
      set(x, y, color(255 * noise(xnoise, ynoise, dnoise + 20 * d * d)));
    }
  }
  
  dnoise += 0.03;
}