I have used ARKit face tracking. By using it, I can get face feature points
x=faceAnchor.geometry.vertices[638][0]
y=faceAnchor.geometry.vertices[638][1]
z=faceAnchor.geometry.vertices[638][2]
Some simple question come to my mind. That is "How ARFaceAnchor determine to vertices indices?" I serached many URLs(apple,stackoverflow),but I couldn't find the truth.
I thought like the dlib, machine learning is used? Where can I find the imformation about that(how calculate face vetices indices)? ARKit's face vertices are more accurate than ARcore what difference methods are used?