chuck.js/lib/RequestAnimationFrame.js

define(['Chuck/Settings'], function(Settings) {

	var requestAnimFrame =  (function(){

        var _setTimeout = function( callback ){
            setTimeout(callback, Settings.BOX2D_TIME_STEP * 1000);
        }

        if (typeof window != 'undefined') {

            return  window.requestAnimationFrame       || 
                    window.webkitRequestAnimationFrame || 
                    window.mozRequestAnimationFrame    || 
                    window.oRequestAnimationFrame      || 
                    window.msRequestAnimationFrame     || 
                    _setTimeout;

        } else {
            return _setTimeout;
        }

    })();

	return requestAnimFrame;
});