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snapshot我正在 ARKit 中使用 SceneKit 运行面部跟踪配置，在每个帧中我可以通过属性或作为缓冲区访问相机源capturedImage，我还能够将每个面部顶点映射到图像坐标空间并添加一些UIView助手（ 1点平方）在屏幕上实时显示所有面顶点，如下所示：

func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
    guard let faceGeometry = node.geometry as? ARSCNFaceGeometry,
        let anchorFace = anchor as? ARFaceAnchor,
        anchorFace.isTracked
        else { return }

    let vertices = anchorFace.geometry.vertices

    for (index, vertex) in vertices.enumerated() {
        let vertex = sceneView.projectPoint(node.convertPosition(SCNVector3(vertex), to: nil))
        let xVertex = CGFloat(vertex.x)
        let yVertex = CGFloat(vertex.y)

        let newPosition = CGPoint(x: xVertex, y: yVertex) 
    // Here i update the position of each UIView …