away3d 3.6 Clipping bug

Question

hello

noun sprite in the away3d 3.6 in FrustumClipping not displayed

why????

        var spr2d:DirectionalSprite;
        var bitMat:BitmapMaterial = new BitmapMaterial(bitData);

        for(var i:int = 0 ; i<500 ; i++)
        {
            spr2d = new DirectionalSprite(bitMat);
            spr2d.z = (Math.random() * 4000)+1500;
            spr2d.x = (Math.random()*categoryDistance)-500;
            spr2d.y = (Math.random()*1000)-500;
            particalContainer.addSprite(spr2d);

        }

tnx for attention