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chenguo4 said:

There are implementations that try to track your head. Not sure how mature they are, but I know they're in the research stage.

yea, the head-tracking/eye-tracking technique for 3D probably will be the future, but it really needs high speed cams and much processing power (and very good software) for low input lags/support of several viewers

I was listing the disadvantages of the "normal" layer technique