How to create nested polygon

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int numVertices=120; //int(random(30,60));
float[] curtX;
float[] curtY;
float[] nextX;
float[] nextY;
float[] angles;
float[] da;

void setup() {
  size(600,600);//,P3D);
  curtX = new float[numVertices];
  curtY = new float[numVertices];
  nextX = new float[numVertices];
  nextY = new float[numVertices];
  angles = new float[numVertices];
  da = new float[numVertices];
  // Pick initial random angles.
  for (int i=0; i<numVertices; i++) {
    angles[i] = i*TWO_PI/float(numVertices); //random(TWO_PI);
    da[i] = random(-.05,.05);
  }
  colorMode(HSB, 255);
  
  background(0);
}

void draw() {
  //background(0);
  fill(0,0,0,10);
  noStroke();
  rect(0,0,width,height);
  stroke(255);
  noFill();
  translate(width/2, height/2);
  //rotateY(map(millis()%7000,0,7000,0,TWO_PI));
  float radius=280;
  for (int i=0; i<numVertices; i++) {
    angles[i] += da[i];
  }
  // Convert the random angles to (x,y) positions.
  for (int i = 0; i < numVertices; i++) {
    curtX[i] = cos(angles[i]) * radius;
    curtY[i] = sin(angles[i]) * radius;
  }
  for( int t = 0; t < 20; t++){
    stroke((map(t,0,20,0,128)+map(millis()%7000,0,7000,0,255))%255,255,map(t,3,20,128,255));
    draw_polygon(t);
    next_gen();
    copy_back();
  }
  stroke(255);
  strokeWeight(3);
  ellipse(0,0,2*radius, 2*radius);
  strokeWeight(1);
}

void draw_polygon(int z) {
  beginShape();
  for (int i = 0; i<numVertices; i++) {
      vertex(curtX[i], curtY[i]);//, -20*z);
  }
  endShape(CLOSE);
}

void next_gen(){
  for( int i = 0; i < numVertices; i++){
    nextX[i] = ( curtX[i] + curtX[(i+1)%numVertices] ) / 2.0;
    nextY[i] = ( curtY[i] + curtY[(i+1)%numVertices] ) / 2.0;
  }
}

void copy_back(){
  for( int i = 0; i < numVertices; i++){
    curtX[i] = nextX[i];
    curtY[i] = nextY[i];
  }
}
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