Hi gang! I started a little playground. http://www.babylonjs-playground.com/#1LNWLE#2 My first time using animationEvent, and it seems to be working just fine.  For a long time, I have wanted ANIMATIONLOOPMODE_PINGPONG.  This is when the animation runs forward, then backward, then forward, etc.  It is one of my favorite types of loop-mode, because it continuously "oscillates", and that is very useful (imho).  WAY back, when I built my CSS animator called Jackal, I used ping-pong (