I’m really late on this one, but here it goes: the new version of the Sandy 3d engine is out in the wild, and one of the changes on the API is that properties are now directly accessible. As a result, creating tweenings with Tweener is pretty easy; Dennis Ippel has a bunch of articles with examples (many with and source available), such as pulling vertices, adding interactivity to 3d objects, and an animated demo. Thanks, Dennis!