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

   }