void setup(){
  size(400, 400, P3D);
  framerate(30);
  noStroke();
}
void draw(){
  background(50);
  translate(width/2, height/2);
  
  //built-in
  fill(0, 0, 255, 50);
  rotateY(frameCount*PI/150);
  rect(-150, -150, 300, 300);

  // custom poly calls
  rotateX(frameCount*PI/120);
  makePoly(5, 150, color(255, 255, 0, 100));
  rotateY(frameCount*PI/110);
  makePoly(3, 100, color(0, 255, 255, 100));
  rotateX(frameCount*PI/130);
  makePoly(8, 45, color(255, 0, 255, 100));
  rotateY(frameCount*PI/50);
  makePoly(12, 25, color(255, 255, 255, 100));
}

//custom poly 
void makePoly(int pts, float radius, color c){
  float angle = 0;
  float x=0, y=0;
  fill(c);
  beginShape();
  for (int i=0; i<pts; i++){
    x = cos(radians(angle))*radius;
    y = sin(radians(angle))*radius;
    vertex(x, y);
    angle+=360/pts;
  }
  endShape();
}