AR face manager
The face manager is a type of trackable manager.
The face manager creates GameObjects for each face detected in the environment. The system only detects human faces.
In some implementations, face tracking requires a different camera (for example, front-facing vs. rear-facing) and might be incompatible with other features, such as plane or image tracking. Consider disabling other AR managers which manage trackables. These include:
Responding to faces
Faces can be added, updated, and removed. Once per frame, if the application detects a face, the AR face manager invokes the facesChanged event. This event contains three Lists of faces that have been added, updated, and removed since the last frame.
When a face is detected, the AR face manager instantiates the Face Prefab to represent the face. The Face Prefab can be left null, but the face manager ensures the instantiated GameObject has an ARFace component on it. The ARFace component only contains data about the detected face.
Visualizing faces
The face provider might provide a mesh that represents the face. The ARFace component exposes vertices, normals, indices, and uvs (texture coordinates). Some or all of these can be available.
The ARFaceMeshVisualizer component generates a UnityEngine.Mesh and updates the MeshFilter on the same GameObject based on the data that the ARFace provides.
Check the face subsystem's SubsystemDescriptor (ARFaceManager.descriptor) for provider-specific features.