It's too perfect to be done in post-production, I think this is the real deal.
One of the greatest animated films (aside from shreck, nemo, wall*e etc) is a french production called
renaissance. AMAZING visuals and a good story.
I love 3D movies, and this is top notch!
EDIT: here's a nice review:
http://dvisible.com/2007/10/01/anima...sance-revival/