1st step
i have used TG2 for scene.
2nd step
using iclone to make animation (bird's) with green background
3rd step
using after effects to mix all together and add some effects
the result
So those are still images rendered in TG?
yes, but rendering ''movie'' with TG2 it's took me a lot.
for me i prefer exploring TG2 with just one or 2 images and make it as background , but need some tunning with After effects. at the moment i work a lot with Unreal engine to make as possible a realistic landscape .
this some tests with UN4: