Papervision3d: Finding 2D coordinates of a 3D object

Papervision3d is probably the most popular 3D flash engine. There are dozen of applications/sites that use it. These days I also decided to create a 3D effect in my portfolio site. Everything works fine, but I needed a tooltip for each of the 3D objects on my scene. To be able to animate everything I needed 2D coordinates of all my 3D elements.

Actually the solution was very easy. I used the "screen" property of my objects. Here is an example (check lines: 59,60):
Download the source files from here.
Check the result here.