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Do we need a calibration button when doing FaceAR?

The face ar doc says we need one.

https://docs.unrealengine.com/en-US/Platforms/AR/HandheldAR/FaceARSample/index.html#calibration

But all apps I have tried don’t have a calibration button, and as a result my brow*Up is always above 0.5. I am wondering if my usage of the apps is correct.

Have anyone here met the same problems?