[away3d] How to zoom into dif sized spheres but make them seem the same size when zoom is done?

[dyc]

Hey guys! I have a pretty complex problem, but Im sure itll be easy
for some of you!

Anyways, I have this globe that you can click on the surface, and it
places another sphere where u clicked, based on how far you dragged
after clicking...that becomes the radius of the new smaller sphere.

I am zooming the camera into the sphere, but it is always a different
size when u get zoomed up to it, because the radius is independent of
the zooming script. What I need help on, is a way to inorporate the
RADIUS of the new sphere into the zooming math, so that I can control
how large the new sphere should be each time...I just want the sphere
to be the same size every time they place a sphere and it zooms, no
matter what the radius of the sphere is...

see what I mean?

Thanks so much!!

here is the code so far:

// New idea use bigger radius with lon/lat data
                        var phi:Number = (90 - _currentLat) * Math.PI / 180;
                        var theta:Number = (_currentLon) * Math.PI / 180;
        // THIS NEXT LINE IS WHERE IM TRYING TO DO THE NEW
CURRENTSELECTEDRADIUS incporporation
                        /*// EARTHRADIUS + ZOOM_DISTANCE_FROM_SURFACE is the 
distance from
the planet to do
                        // NEW WAY this is where the camera zooms to - 
integrating with
currentSelectedRadius of sphere.
                        var cameraZoomX:Number = ((EARTHRADIUS +
ZOOM_DISTANCE_FROM_SURFACE) * Math.sin(phi) * Math.cos(theta)) /
currentSelectedRadius;
                        var cameraZoomZ:Number = ((EARTHRADIUS +
ZOOM_DISTANCE_FROM_SURFACE) * Math.sin(phi) * Math.sin(theta)) /
currentSelectedRadius;
                        var cameraZoomY:Number = ((EARTHRADIUS +
ZOOM_DISTANCE_FROM_SURFACE) * Math.cos(phi)) /
currentSelectedRadius;*/

                        // OLD WAY
                        var cameraZoomX:Number = (EARTHRADIUS + 
ZOOM_DISTANCE_FROM_SURFACE)
* Math.sin(phi) * Math.cos(theta);
                        var cameraZoomZ:Number = (EARTHRADIUS + 
ZOOM_DISTANCE_FROM_SURFACE)
* Math.sin(phi) * Math.sin(theta);
                        var cameraZoomY:Number = (EARTHRADIUS + 
ZOOM_DISTANCE_FROM_SURFACE)
* Math.cos(phi);

                        var tagX:Number = (EARTHRADIUS + 
ZOOM_DISTANCE_FROM_SURFACE + 500)
* Math.sin(phi) * Math.cos(theta);
                        var tagZ:Number = (EARTHRADIUS + 
ZOOM_DISTANCE_FROM_SURFACE + 500)
* Math.sin(phi) * Math.sin(theta);
                        var tagY:Number = (EARTHRADIUS + 
ZOOM_DISTANCE_FROM_SURFACE + 500)
* Math.cos(phi);

                        TweenLite.to(zoomCamera, 3, { x: cameraZoomX, y: 
cameraZoomY, z:
cameraZoomZ, ease:Expo.easeOut} );