Ironically, it doesn't require TrueDepth camera to track the facial muscles, at least it doesn't require TrueDepth Camera in iOS 11.1. Simply try these two experiments:
1. Block the TrueDepth Camera lens, only expose the FaceTime Camera: it works fine;
2. Turn off the light, it won't work (TrueDepth Camera have it's own infrared source)
Guess this feature only utilizes some neural network algorithms and the A11 chip. It should be able to port on iPhone 8, which have the same A11 chip.
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Update:
It's okay to have this exclusive on iPhone X. But they shouldn't give people an impression that such limitation is because of the hardware: https://support.apple.com/en-us/HT208190
1. Block the TrueDepth Camera lens, only expose the FaceTime Camera: it works fine;
2. Turn off the light, it won't work (TrueDepth Camera have it's own infrared source)
Guess this feature only utilizes some neural network algorithms and the A11 chip. It should be able to port on iPhone 8, which have the same A11 chip.
--
Update:
It's okay to have this exclusive on iPhone X. But they shouldn't give people an impression that such limitation is because of the hardware: https://support.apple.com/en-us/HT208190
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