read this interview:

"I was thrilled when I first saw Polar Express 3D. It proved that 3D was now very good quality and we then saw Disney and Dreamworks announce they would be making films in 3D from now on. I was aware of the PC S-3D gaming scene, but it had always been very niche. But now these films would be mass market, then people watching these films would want the games to be S-3D. "