RealityKit 判斷手指觸摸物件

1. 用Reality Composer編輯物件『屬性』，勾選『物理效果』『加入』
2. 將ARFrame.capturedImage轉成CVPixelBuffer

   func session(_ session: ARSession, didUpdate frame: ARFrame) {

           guard let arView = arView else {return}

           // Do not enqueue other buffers for processing while another Vision task is still running.

           // The camera stream has only a finite amount of buffers available; holding too many buffers for analysis would starve the camera.

           guard currentBuffer == nil, case .normal = frame.camera.trackingState else {

               return

           }

           // Retain the image buffer for Vision processing.

           let currentBuffer = frame.capturedImage

   }

3. 利用Vision偵測食指
   

   let requestHandler = VNImageRequestHandler(cvPixelBuffer: currentBuffer, orientation: orientation)

   visionQueue.async {

           do {

                   // Perform VNDetectHumanHandPoseRequest

                   try requestHandler.perform([self.handPoseRequest])

                   // Continue only when a hand was detected in the frame.

                   // Since we set the maximumHandCount property of the request to 1, there will be at most one observation.

                   guard let observation = self.handPoseRequest.results?.first else {

                       return

                   }

                   // Get points for index finger.

                   let indexFingerPoints = try observation.recognizedPoints(.indexFinger)

                   // Look for tip points.

                   guard let indexTipPoint = indexFingerPoints[.indexTip] else {

                       return

                   }

                   // Ignore low confidence points.

                   guard indexTipPoint.confidence > 0.3 else {

                       return

                   }

                   

                   

           } catch {

                   print("Error: Vision request failed with error \"\(error)\"")

           }

   }

4. 將Vision的座標轉成ARView的座標
   

   // Convert points from Vision coordinates to ARView coordinates.

   let point = indexTipPoint.location

   let tip = CGPoint(x: point.x * width, y: (1 - point.y) * height)

sample code

RealityKit 判斷物件點擊方法2

1. 用Reality Composer編輯物件『屬性』，勾選『物理效果』『加入』
2. 替arView加上手勢功能
   

   arView.addGestureRecognizer(

         UITapGestureRecognizer(

               target: xxxx,

               action: #selector(XXXX.handleTap(recognizer:))

       )

   )

3. 
   

   @objc func handleTap(recognizer: UITapGestureRecognizer) {

           let tapLocation = recognizer.location(in: arView)

           let entity = arView.entity(at: tapLocation)

           guard entity == boxAnchor?.steelBox else { return }

           // entity 即點擊物件

   }

RealityKit 判斷物件點擊方法1

 直接用Reality Composer編輯物件行為

1. 選取物件
2. 顯示行為(⌥⌘B)
3. 加入行為『點按與反轉』

建立一個空的MapView

1. 使用satellite，除了地形圖，沒有多餘的文字。
2. 建一個MKTileOverlay，利用canReplaceMapContent隱藏地圖。

在Heroku上發佈MochiWeb

注意：

1. 官方https://github.com/heroku/heroku-buildpack-erlang.git過舊（OTP和cebar），所以需要替代方案
2. Heroku的port是亂數產生，所以需要動態拿到port

參考

SWIProlog on TextMate

因TextMate提供的Plugin有問提，只好自己再改一下

iOS hot reloading

1. 安裝 InjectionIII 並啟動
2. 打開 XCode 和 專案
3. 在appDelegate加入

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        // Override point for customization after application launch.z

        #if DEBUG

        #if targetEnvironment(simulator)

        #if os(iOS)

        Bundle(path: "/Applications/InjectionIII.app/Contents/Resources/iOSInjection.bundle")?.load()

        #elseif os(tvOS)

        Bundle(path: "/Applications/InjectionIII.app/Contents/Resources/tvOSInjection.bundle")?.load()

        #endif

        #elseif os(macOS)

        Bundle(path: "/Applications/InjectionIII.app/Contents/Resources/macOSInjection.bundle")?.load()

        #endif

        #endif

        return true

    }

PS.
已經秀出來的view並未改變。但是，新present出的view確實已經改變

如需要改變已秀出來的view，需在每個controller上實作

@objc func injected() {

    // 可馬上更新的code

}

建議的懶人法

    @objc func injected() {

        // 移除全部vc/view

        if self.childViewControllers.count > 0{

            let viewControllers:[UIViewController] = self.childViewControllers

            for viewContoller in viewControllers{

                viewContoller.willMove(toParentViewController: nil)

                viewContoller.view.removeFromSuperview()

                viewContoller.removeFromParentViewController()

            }

        }

        

        configureView()

    }

    

    func configureView() {

        

    }

    

    override func viewDidLoad() {

        super.viewDidLoad()

        configureView()

    }