how can he make them into 3D. Don't movies have to be filmed that way? If I'm not mistaken, you film the movie with 2 cameras, one for each eye. That's how you get the 3D effect right?
No, GL can go back and convert them, but it would cost alot of money. Apparently, the cost of converting a traditional 2-D movie into 3D is between $50,000 and $100,000 per minute.