public void draw() {
   background(0);
   lights();
   if (commandsRight != null) commandsRight.display();
   if (videoRight != null) videoRight.display();
   if (commandsLeft != null) commandsLeft.display();
   if (videoLeft != null) videoLeft.display();
   if (markerControlled != null) markerControlled.display();
   translate(width / 2, height / 2, sceneZoom);
   rotateX(sceneRotX);
   rotateY(sceneRotY);
   rotateZ(sceneRotZ);
   if (controller != null) controller.display();
 }