When Cameron directed the film, he saw the CG right in front of his eyesKHarvey16 said:Manipulating digital environments. That stuff wasn't there. The cinematography is in a computer. When you see any great CGI sequence in any movie ever, you don't say, "wow, the director did a great job directing this scene!" No, you say it was a great special effect. If realizing worlds like in Avatar is worthy of a best director Oscar than someone making an animated film should also be able to win.
He directed the film within the CG world.