import processing.opengl.*;

float a; 

void setup() {
  background(0);
  size(400,400, OPENGL);
  fill(0);
  noStroke();

}

void draw() {
  translate(width/2, height/2);
  rotateX(a);
  rotateY(a*10);
  rotateZ(a*5);
  fill(255,0,150,150);
  ellipse(-100, -100, 10, 10);
  a += 0.01;
}