Papervision3D坐标轴

scene.addChild(new UCS());

package {
    import flash.display.Sprite;
    import flash.events.Event;
    import org.papervision3d.view.*;
    import org.papervision3d.objects.*;
    import org.papervision3d.objects.primitives.*;
    import org.papervision3d.objects.special.*;

    public class HelloPV3D extends Sprite {

        private var view:BasicView;

        public function HelloPV3D()  {
            view = addChild(new BasicView()) as BasicView;
            view.scene.addChild(new UCS());
            view.scene.addChild(new Sphere());
            this.addEventListener(Event.ENTER_FRAME,update);
        }
        private function update(e:Event):void{
            view.camera.orbit(mouseY/stage.stageHeight,mouseX/stage.stageWidth,false);
            view.singleRender();
        }
    }
}