Amply Interview

Question 1

What is ARKit?

Answer 1

Framework that handles data input for AR experiences

Question 2

What is SceneKit?

Answer 2

3D engine SDK. Can be used with or without ARKit and has been around for longer.

Question 3

What is RealityKit

Answer 3

Simulate and render 3D content for use in your augmented reality apps. Replacement for SceneKit

Question 4

What is QuickLook?

Answer 4

Place 3D objects in the real world

Question 5

What is RoomPlan?

Answer 5

An API inside of ARKit that uses LiDAR

Question 6

What does LiDAR stand for?

Answer 6

Light Detection And Ranging

Question 7

How does RoomPlan work?

Answer 7

• Present a RoomCaptureView
• Initiate a RoomCaptureSessions
• Output CapturedRoomData + Captured Room structs

Question 8

List some of the RoomCaptureSessionDelegate methods

Answer 8

• capture session did start
• capture session did update
• capture session did provide instruction
• capture session did end

Question 9

What is USDZ

Answer 9

USDZ is a 3D file format that shows up as AR content

Question 10

In Apple’s LiDAR demo, describe which parts of the UX use which software

Answer 10

• the view capturing and highlighting is done by RoomPlan
• the 3d rendering is done by RealityKit

Question 11

What is MetalKit?

Answer 11

Graphics rendering, primarily for games

Question 12

Explain the stack in Apple’s LIDAR example

Answer 12

• swiftui view
• cameramanager (similar to viewmodel)
• controller (delegate methods)

Question 13

How to embed a UIViewController in a SwiftUI view?

Answer 13

• Create a struct that conforms to UIViewControllerRepresentable
• create the VC in makeUIViewController()
• update data in updateUIViewController()

Question 14

When does updateUIViewController get called?

Answer 14

When the state of your app changes

Question 15

What are the two delegate methods for UIViewControllerRepresentable?

Answer 15

• makeUIViewController()
• updateUIViewController()

Question 16

How to implement a SwiftUI coordinator?

Answer 16

• create a Coordinator class as a child of the SwiftUI wrapper / representable
• give the coordinator a parent property that it inits with
• then the UIViewController can send updates via the coordinator

Question 17

How to embed SwiftUI view in UIKit?

Answer 17

Instantiate the swiftUI view into UIKit by calling UIHostingController.init()

let view = UIHostingController(rootView: SwiftUIView())