Just playing around so no idea if its a good idea. Set the bounds of the object to false. eg plane.bounds = new NullBounds(false); Its no longer visible or being rendered.
Bring it back plane.bounds = new AxisAlignedBoundingBox(); Or just send it offscreen/ behind camera. Or if your using Bitmapmaterial you can set the alpha BitmapMaterial(plane.material).alpha = 0; But that still goes through render
