[away3d] calculate the size of a plane on different distance to the camera

[jens lofberg]

Hi (and thanks for a great tool)
I need to calculate how close to the camera I put a plane so the space 
between the plane edge and the screen edge is always the same.
The size of the plane is dynamic.
For now I start my sceen by moving my plane in z until I get the good 
size, using:

public function getScreenSize():Object {
            var sessionContainer:DisplayObjectContainer = 
_view.session.getContainer(_view) as DisplayObjectContainer;
            var drawnObject:DisplayObject = sessionContainer.getChildAt(0);
            return (drawnObject.getRect(this))
}

Does anyone know a Math formula doing the same thing?
Thanks

jens lofberg
www.cubedesigners.com