DESCRIPTION
This weekend I've sat and read the documentation on renpy's new 3D stage. It is as promising as I hoped, however, there are tons of kinks to iron out when it comes to using it inside screens.
My experiments resulted in a handful of transitions that you can apply to the camera to get interesting effects. They are by no mean the extent of what you can do, but they should give you a good idea of how and where to start.
Download the code from the attachments and give it a try.
Note: The video is still uploading