Jaws were on the floor when Square Enix showed the three minute Agni's Philosophy demo earlier this year in Los Angeles. They were on the floor this weekend when Square Enix once again showed off the tech. To dazzle like that takes time. A lot of time.
While showing off the mind-blowing demo this weekend, Square Enix said (via Game Watch) that planning took six months and developing it took another six months. That's an entire year for three minutes of footage.