Sony is showing off headtracking using only the PlayStation Eye, no glasses needed, no Wii-mote. Unlike recent head-tracking video sensations, this clip shows a set-up that doesn't require strapping any Wii hardware to your head. Nor does it require fancy glasses, like this one made by a programmer from Sony. No. This version requires just the official PS3 camera. And a person with a face and some mobility in their neck.