With the XPresso tag node you reference every tag that has been added to an object. In this example we’ll set up a simple iteration in XPresso and combine it with the tag node in order to change the “Size X” and “Size Y” values of a bunch of External Compositing tags.
This technique allowed me to export the scene to After Effects, not only including the 3D camera, but also including the solids with correct sizes. So no need to render object buffers for later compositing.
One obvious advantage i forgot to mention: In Cinema 4D it is much easier to place your dummy-solids in an interesting way. For instance, you could create a huge tunnel and make a cool flythrough with the camera. Positioning your solids that way in After Effects would be a pain.