Hello, I am an individual developer working on a macOS application using SwiftUI and RealityKit. I would like to understand the feasibility of face-related tracking on macOS when using an external USB camera, compared to iOS/iPadOS. Specifically: • Does macOS provide an ARKit Face Tracking–equivalent API (e.g., real-time facial expressions, gaze direction, depth)? • If not, is it common to rely on Vision / AVFoundation as alternatives for: • Facial expression coefficients • Gaze estimation • Depth approximation • In an environment without dedicated sensors such as TrueDepth, is it correct to assume that accurate depth data and high-fidelity blend shape extraction are realistically difficult? Any clarification on official limitations, recommended alternatives, or relevant documentation would be greatly appreciated. Thank you.