The concept is simple: When we look at a cartoon-like drawing of a person, like Charlie Brown, our brains fill in the missing information, and the cartoon seems warm, cute, and lifelike. But when an animated version of a human becomes incredibly close to being real, we start focusing instead on the tiny details that aren't right: The slack skin, the not-quite-dewy-enough eyes, the stiff body movements. Paradoxically, the more realistic the human becomes -- the worse they look. Sure, enhanced graphics look terrific when lavished on static things, like scenery or smoke or bullets. But the human face? Our video-game graphics aren't up to it -- and, if you believe the Valley theory, may never be. (more)
collision detection: PS3 games: Plunging deeper into the "Uncanny Valley"