When Tim Sweeney is out in the world discussing pedestrian things—the sweet tea at a particular barbecue restaurant, say, or the irony of having a hockey team in North Carolina, a place without much naturally occurring ice—part of him seems to be missing. It’s as if some roped-off area of his parietal lobe is back in the office, mulling over whatever conundrum is plaguing his graphics guys: how best to digitally re-create the diffusion of light through skin maybe, or how to show the world reflected in a character’s eye.

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(Source: Wired)