ARKit(SceneKit) 臉部表情追蹤

1.  建立臉部追蹤

// Create a session configuration

 let configuration = ARFaceTrackingConfiguration()

// Run the view's session

sceneView.session.run(configuration)

2.  建立臉部模型

func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {

    if anchor is ARFaceAnchor {

        let faceMesh = ARSCNFaceGeometry(device: sceneView.device!)

        faceMesh?.firstMaterial?.lightingModel = .physicallyBased

        let node = SCNNode(geometry: faceMesh)

        return node

    } else {

        return nil

    }

}

3.  更新臉部表情

func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {

    if let faceAnchor = anchor as? ARFaceAnchor, let faceGeometry = node.geometry as? ARSCNFaceGeometry {

        faceGeometry.update(from: faceAnchor.geometry)

    }

}