actionscript-3 - AS3 Pageflip 効果: めくるとページが反転する

Question

ページめくり効果のある本のスクリプトがあります。しかし、ページを右から左にめくると、白いページの裏はページの表からの反射です。白くするって知ってる？

    import fl.transitions.Tween;
    import fl.transitions.easing.*;
    import fl.transitions.TweenEvent;
    import flash.display.Sprite;
    import flash.display.Loader;

    var cont:DisplayObject;
    var cont2:DisplayObject;
    var imgLoader:Loader;
    var pages:Array = [];

for (var i:int=0; i<=4; i++)
    {
        imgLoader  = new Loader();
        imgLoader.contentLoaderInfo.addEventListener(Event.INIT, onLoadJPEG);
        imgLoader.load(new URLRequest(""+i+".png"));
    }

    var imgLoader2:Loader;

    imgLoader2  = new Loader();
    imgLoader2.contentLoaderInfo.addEventListener(Event.INIT, onLoadSketch);
    imgLoader2.load(new URLRequest("voltaatrassketchbook.png"));

    function onLoadJPEG(e : Event):void
    {
        cont = e.target.loader;//obter o loader associado ao LoaderInfo 
        cont.x = 250;
        cont.y = 50;
        cont.width = (445 - 100) / 2;
        cont.height = (604 - 100) / 2;
        addChild(cont);
        cont.addEventListener(MouseEvent.MOUSE_UP, FlipPage);
        pages.push(cont);
    }

    function onLoadSketch(e : Event):void
    {
        cont2 = e.target.loader;//obter o loader associado ao LoaderInfo 
        cont2.x = 450;
        cont2.y = 300;
        cont2.width = 181 / 2;
        cont2.height = 127 / 2;
        addChild(cont2);
        cont2.addEventListener(MouseEvent.MOUSE_UP, volta);
    }

    function FlipPage(e:MouseEvent):void
    {
        setChildIndex(DisplayObject(e.currentTarget), this.numChildren - 1);
        if (e.currentTarget.rotationY == 0)
        {
            var myTween:Tween = new Tween(e.currentTarget,"rotationY",Regular.easeInOut,0,180,1,true);
        }
        if (e.currentTarget.rotationY == 180)
        {
            var myTween:Tween = new Tween(e.currentTarget,"rotationY",Regular.easeInOut,180,0,1,true);
        }
    }

    function volta(e: MouseEvent):void
    {
        gotoAndStop(1);
        for (var i:int = 0; i < pages.length; i++)
        {
            DisplayObject(pages[i]).visible = false;
        }
        cont2.visible = false;
    }