ARFaceAnchor.BlendShapeLocation

Discussion

The blendShapes dictionary provided by an ARFaceAnchor object describes the facial expression of a detected face in terms of the movements of specific facial features. For each key in the dictionary, the corresponding value is a floating point number indicating the current position of that feature relative to its neutral configuration, ranging from 0.0 (neutral) to 1.0 (maximum movement).

ARKit provides many blend shape coefficients, resulting in a detailed model of a facial expression; however, you can use as many or as few of the coefficients as you desire to create a visual effect. For example, you might animate a simple cartoon character using only the jawOpen, eyeBlinkLeft, and eyeBlinkRight coefficients. A professional 3D artist could create a detailed character model rigged for realistic animation using a larger set, or the entire set, of coefficients.

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