Paul confirms that RE6 was post-converted into 3D!!!
Wow, this is a big turning point for Paul! He stated that the post-conversion technology has significantly improved (I agree!) and he wanted to shoot scenes without being restricted by large cameras/cranes but directed the film with 3D in mind.
SOURCE: http://collider.com/resident-evil-6-paul-w-s-anderson-interview/#nycc
Cheers!
Luke