[away3d] away3Dlite - how to totally remove objects?

[dp]

I've been messing around with adding and removing objects depending on
their proximity. However at the moment I suffer from constantly
deteriorating performance, even though the total faces remain at a
constant low level. I assume I'm not removing the objects correctly
but don't know how else?

Im pretty stuck. thanks!



private function proximity():void
                {

                        if ((obj.x >= oldX + 50 || obj.x <= oldX - 50) || 
(obj.y >= oldY
+50 || obj.y <= oldY -50))
                        {
                                for each ( var p:Plane in neighbors)
                                {
                                        scene.removeChild(p);
                                }

                                neighbors = sdb.getAllNeighbors(obj.x, obj.y);

                                for each ( p in neighbors)
                                {
                                        scene.addChild(p)
                                }

                                oldX = obj.x;
                                oldY = obj.y;
                        }
                }