public var physStepCounter:int = 0;//number of physics steps per frame.

        private var _prevTime:Number = 0;
        private var _currTime:Number;
        private var _elapsedTime:Number;
        private var _accumulator:Number = 0;

        public var interations:int = 10;
        public var physScale:Number = 30;//3d units to 1 b2d unit!
        public var accMult:Number = 1;//This is what we use to speed up or slow down time in the engine. Changes physics steps and Entity Thinking per frame!!! CAREFUL.
        public var loopFPS:Number = 30.0;//this uses 33ms for timestep, also equals about 30fps.
        //TODO: Perhaps use target FPS?
        public var timeStep:Number = accMult / loopFPS;//this uses 33ms for timestep, also equals about 30fps.

        /**
         * Game loop
         */
        private function gameLoop(e:Event):void
        {
            //FIXME: Combine this crap?

            // update loop
            if (C2D.accumulator)
            {
                _currTime = getTimer();
                _elapsedTime = (_currTime - _prevTime) * 0.001;
                _prevTime = _currTime;

                if (_elapsedTime > 0.25)
                {
                    _elapsedTime = 0.25;
                }

                _accumulator += _elapsedTime * accMult;

                timeStep = accMult / loopFPS;

                Tweener.setTimeScale(accMult);

                while (_accumulator >= timeStep)
                {
                    update();
                    physStepCounter++;
                    _accumulator -= timeStep;
                }
                //trace('update function fire! ' + physStepCounter);
                physStepCounter = 0;
            }
            else
            {
                update();
            }
            // render loop
            render();
        }