           geometry: planeGeometry,
            material: billdboardMaterial,
            x: rand(-1, 1),
            y: rand(-1, 1),
            z: rand(-1, 1)
        });
        rect.setScale(rand(0.08, 0.2));
        stage.addChild(rect);
    }

    var centerRect = new Hilo3d.Mesh({
        geometry: planeGeometry,
        material: billdboardMaterial,
        x: 0,
        y: 0,
        z: 0
    });
    centerRect.setScale(1);
    stage.addChild(centerRect);
</script>
</body>
</html>