isnt the touch id behind the phone? or integrated in the screen itself?
It is not there, period.
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Sunglasses with polarized lenses would almost assuredly block more infrared light from passing through the lenses, reaching the eyes and getting additional measurement points.
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You guys really don't understand the unlock in pocket concept. It's not about unlocking in your pocket. Obviously???
It's about the fact that with Touch ID the device is unlocked before you can physically view the display with your eyes, if you pull it out of your pocket pressing the home button while bringing it up. With facial recognition it's impossible to do this, thus you rely on the speed of Face ID unlocking after the phone is perfectly viewable to your face. The question is how fast this will work of course and how well it will work at oblique angles. There's no reason to discuss it because Apple will show this in several weeks time, but the point remains.
Anyway, I think yourself and some others mistakenly believe that the infrared sensors for facial recognition will just be running all the time. They of course cannot for battery efficiency. In a perfect world they would run constantly and the phone would instantly lock if your face was out of the frame (unless you gave a time-delayed permission to another user, or added their face).
You are just whipping yourself into a tizzy over something that is done, past tense. You will either like it or not and always have the choice if you want to buy. BUT, no matter how much complaining, it is what it is.