process = function process() {
	        _this2.request = requestAnimFrame(function () {
	          return process();
	        });
	        if (!_this2.enabled) return;

	        for (var i = 0, ll = _this2.loops.length; i < ll; i++) {
	          var e = _this2.loops[i];
	          if (e.enabled) e.execute(e.clock);
	        }
	      }
@method start
@description Start rendering loop and physics simulation (if you use version with physics).
@memberof module:core.App