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