====== AR Foundation Setup - marker based ======

  * Package manager:
    * build setting: switch to target platform
    * install AR foundation + ARCore XR from Unity registry in Package Manager
    * build setting > Player setting: 
      - OpenGL before vulkan
      - min api : android api level 26 (store 30)
      - scripting backend: ILL2CPP
      - uncheck armv7 and check arm64
      - xr plug-in, check ARCore
    * create XR > AR session + AR session origin
    * asset > create XR > reference image library (to load marker image)
    * ar session origin > add component > ar tracked image manager 
      * (put library there)

====== AR Foundation Setup - markerless ======

  * markerless means more task for phone to calculate
    * surface detection + motion tracking+ environment lighting
    * detection limitation: 
      * surface w no texture, bad lighting, transparent and reflective surface, moving objects

  * build step:
    * build setting: switch to target platform
    * install AR foundation + ARCore XR from Unity registry in Package Manager
    * build setting > Player setting: 
      - OpenGL before vulkan
      - min api : android api level 26 (store 30)
      - scripting backend: ILL2CPP
      - uncheck armv7 and check arm64
      - xr plug-in, check ARCore
    * create XR > AR session + AR session origin
    * ar session origin > add component > ar plane manager
      - outliner > create XR > AR Default Plane, put it prefab
      - drag that plane prefab into AR Plane Manager (plane prefab)
      - direction mode: horizontal
    * ar session origin > add component > ar raycast manager
    * ar session origin > add component > AR environment prob manager
    * (extra) Direction Light > add component > HDRLightEstimation.cs (put ar camera there)
      * then, at ar camera manager, light estimation : everything
    * (extra) ar session origin > add component > PlaceOnPlane.cs (place holderPrefab there, above raycast manager there)

in short:
  - AR Session
  - AR session origin (ar plane mgr < place prefab; ar  raycast mgr; ar env prob mgr)
    - ar camera
  - light (hdrLightEmission)
extra interactive
  * package add: XR interactive toolkit (no for new input, go ahead for update)
  * root of interactive prefab root GameObject: - add
    * AR selection(mode:single/mult)/Translation/Rotation/Scale interactable component
      * (selection > put obj for selection visualizer)
      * [opt: use AR Select interactable -- Single]
    * collider
  * base quad obj with new material (unlit/transparent > with texture)
  * Extra 2:
    * AR camera: > add AR gesture mgr
    * AR session: > add XR interaction mgr
    * AR session: > add AR placement interactable (put to place prefab there, select mode: single/multi)
      * [opt: use AR Placement interactable -- Single]

====== AR Foundation Setup - markerless v2 ======

  - build setting: switch to target platform
    * building setting > player setting: other > input setting: both
  - Package Manager from Unity registry : install (AR foundation) + (ARCore XR) + (XR interactive toolkit)
    * note: if xr interactive pop up, choose  (no for new input, go ahead for xr update)
  - build setting > Player setting - other settings: 
    - OpenGL before vulkan
    - min api : android api level 26 (store 30)
    - scripting backend: ILL2CPP
    - uncheck armv7 and check arm64
    - input: both (need to restart Unity)
    - xr plug-in, check ARCore
  - create XR > AR session + AR session origin
    - ar session origin > add: ar plane manager
      - outliner > create XR > AR Default Plane, put it prefab
      - drag that plane prefab into AR Plane Manager (plane prefab)
      - direction mode: horizontal
      - drag that plane prefab into AR Plane Manager (plane prefab)
    - ar session origin > add: ar raycast manager
    - ar session origin > add: ar anchor manager
    - ar session origin > add: AR environment prob manager
        - (opt) HDRLightEstimation.cs into Directional Light, (put ar camera there); then, at AR camera manager, light estimation : everything
    - AR camera: > add AR gesture interactor
    - AR session: > add XR interaction mgr
    - AR session: > add AR placement interactable [opt: use AR Placement interactable – Single] (put to place prefab there, select mode: single/multi)
  - create GameObject Prefab
    - root GameObject > - add: collider (if its children no collider)
    - root GameObject > - add : AR selection interactable 
      - (opt) quad obj prefab with new material (unlit/transparent > with texture)
      - put that selector prefab inside the GameObject prefab, hide, and drag it to selector indicator.
      - alternative: [opt for single prefab case: ARSelectionInteractableAuto.cs];
    - root GameObject > - add : Translation [opt: ARTranslationInteractableAnchor.cs]
    - root GameObject > - add : Rotation/Scale interactable component
  - create UI 
    - create canvas (1080x1920, scale with screen )
    - image with moving sprite
      - ctrl+6: animation panel, select the image, and create, and drag image seq into animation
      - make the image not blocking user click, uncheck Image > Raycast Target
    - (opt) UIManager script --> Canvas object
      * AR Camera -> UIManager (AR Camera manager)
      * AR Session Origin -> UIManager (Placement manager)
      * Plane vis prefab -> Plane Prefab
      * Go To AR session > AR placement Interactable Single Anchor: 
        * interactable events: add new, drag Canvas to object, and use PlacedObject() function as response
  - prefab animation








====== AR GPS ======

  * import AR GSP package, right click add > AR GPS > Create basic scene structure
  * GSP stage object, uncheck "Use moving average"

====== UI Setup ======

  * image with moving sprite
    * ctrl+6: animation panel, select the image, and create, and drag image seq into animation
    * make the image not blocking user click, uncheck Image > Raycast Target

====== Hardware Debug ======

  * add package: android logcat
  * window > analysis > android logcat
====== Other related info ======

  * https://www.quality-wolves.com/arkit-vs-arcore-vs-vuforia

Tool:
  * view phone screen on windows:
    * https://github.com/Genymobile/scrcpy