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Maybe the tracking of hands for the controls do not work outside. At least with the kinect, the IR projection that it depends on to map the 3d space will not work well (or at all) in direct sunlight. When I was working with robotics that had kinects mounted for 3d vision we always had to put the blinds down when the sun was shining into the office.

They're translucent lenses. They presumably use the mounted cameras to map the world, but they don't use them to actually display the world to you.

I'm pretty sure he said in the demo that it did not use a camera.

seeing something like this without knowing how it works drives me crazy!