Blitz tweens automatically. I assume you have something specific in mind in which case you should describe what you are trying to do more specifically. For example, what do you mean by "animate through the whole lot?" Also, can you describe the inbetween frames you are after? Are they simply frames on the straight path from point A to point B or are they some sort of complex motion? Also, do you want to do this in code or do you want to do this in an animation tool and export the animated model?