It only takes a quick, comparative glance at Pong and BioShock to see how far gaming technology has coming in a relatively short time. But despite all the progress, we haven't quite reached the pinnacle of a real-time, controllable, photo-realistic environments quite yet. What's stopping us? Popular Science takes a look with a recent piece on the ten greatest challenges in making realistic games.

The photo essay looks at some neat cutting edge technology aimed at fixing virtual modeling problems both natural......

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