gaze3.swift

func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
        lastTime = time
        if time > spawnTime {
            
            if faceAnchor != nil {
                DispatchQueue.main.async { [self] in
                    self.cubeNode.simdOrientation = faceAnchor!.leftEyeTransform.orientation
                    
                    let leftOut = faceAnchor?.blendShapes[.eyeLookInLeft]?.doubleValue
                    let rightOut = faceAnchor?.blendShapes[.eyeLookInRight]?.doubleValue
                    let rightUp = faceAnchor?.blendShapes[.eyeLookUpRight]?.doubleValue
                    let leftDown = faceAnchor?.blendShapes[.eyeLookDownLeft]?.doubleValue
                    let angle = rad2deg(Double(faceAnchor!.transform.orientation.angle))
                    
                    looked.gazeX = rightUp!.description
                    looked.gazeY = angle.description
                    
                    var divisor = 0.3
                    
                    if leftOut! < divisor && rightOut! < divisor {
                        sphereNode.simdPosition = SIMD3(x: 0, y: 0, z: -6)
                        sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.red.withAlphaComponent(0.90)
                    }
                    
                    if angle < 8 {
                        var corner = false
                        if leftOut! > divisor && rightUp! > 0.1 {
                            sphereNode.simdPosition = SIMD3(x: -1, y: 1, z: -6)
                            sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.yellow.withAlphaComponent(0.90)
                            corner = true
                        }
                        if rightOut! > divisor && rightUp! > 0.1 {
                            sphereNode.simdPosition = SIMD3(x: 1, y: 1, z: -6)
                            sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.yellow.withAlphaComponent(0.90)
                            corner = true
                        }
                        if leftOut! > 0.2 && leftDown! > 0.1 {
                            sphereNode.simdPosition = SIMD3(x: -1, y: -1, z: -6)
                            sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.purple.withAlphaComponent(0.90)
                            corner = true
                        }
                        if rightOut! > 0.2 && leftDown! > 0.1 {
                            sphereNode.simdPosition = SIMD3(x: 1, y: -1, z: -6)
                            sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.purple.withAlphaComponent(0.90)
                            corner = true
                        }
                        if !corner {
                            if leftOut! > divisor {
                                sphereNode.simdPosition = SIMD3(x: -1, y: 0, z: -6)
                                sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.blue.withAlphaComponent(0.90)
                            }
                            if rightOut! > divisor {
                                sphereNode.simdPosition = SIMD3(x: 1, y: 0, z: -6)
                                sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.blue.withAlphaComponent(0.90)
                            }
                            if rightUp! > 0.1 {
                                sphereNode.simdPosition = SIMD3(x: 0, y: 1, z: -6)
                                sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.green.withAlphaComponent(0.90)
                            }
                            if leftDown! > divisor {
                                sphereNode.simdPosition = SIMD3(x: 0, y: -1, z: -6)
                                sphereNode.geometry?.firstMaterial?.diffuse.contents = UIColor.green.withAlphaComponent(0.90)
                            }
                        }
                    }                 
                }
            }
            spawnTime = time + TimeInterval(0.25)
        }
    }
    
    func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
        guard let faceAnchor = anchor as? ARFaceAnchor else { return }
        
        self.faceAnchor = faceAnchor
    }

    func rad2deg(_ number: Double) -> Double {
        return number * 180 / .pi
    }