AR Example App

[tonyskansf]

This PR contains a WIP example app for the AR lecture.

The application's task is to show a bounding box helping users measure the necessary dimensions for a packaging box.

Features

• Show the bounding box on tap gesture.
  • Note: The initial requirement was to show the bounding box around a detected real-world object; however, this task is firstly not always accurate and would need much more knowledge, which I think would be way out of the lecture's scope.
• Move the bounding box around with a pan gesture.
• Scale the bounding box with a pinch gesture.
• Resize respective sides/faces of the bounding box by dragging one of its faces with a long press gesture.

[tonyskansf]

2) I have issue to draw box tapping on screen. What should I be looking for? A raycast from sceneView in gestureManager return empty results.

I think sometimes under bad conditions the hit test fails. I'll try to explicitly add plane detection and see if it helps.

3) There are many things to be more described in the code (maybe it is in presentation) but those we will add at the end to do a good mix with presentation.

I've gone through the code again and have added some extra comments. Let me know if there are any other parts that needs more describing.

5) the bottom panel on the camera with frames etc is by default? what are those values? should we hide it?

It is not. It set with sceneView.showsStatistics = true. If needed we can hide it.