====== Vuforia Base Startup Resource ======

  * get unity LTS version
  * get vuforia latest unitypackage: https://developer.vuforia.com/downloads/sdk
  * create free vuforia account to create image target database:
    - register
    - go License Manager, Get Basic button to create a project license,
    - then click the license name, it will show the long string license key, copy that and save to a text
    - go to target manager tab on the webpage (next to license manager)
    - Add Database, to store the image track references
    - click the database to add the target, (normally image designed to print on A4 paper 0.29 x 0.2 in size)
      * marker must be contrast in term of greyscale (good like edge detection, not like gradient)
      * corner is good, round edge is bad
      * marker must be no repeat or pattern in itself
      * feature points evenly distributed and enough feature points
      * jpg, png and enough resolution
      * print size at least > 12cm in size
    - once done, click Download Database as another unitypackage.
  * get vuforia base and database package into unity project
  * configure project setting: (Build setting > Player setting > Player tab > other setting)
    * for Graphics APIs, drag OpenGLE3 above Vulkan
    * andorid api: at least api 26 (v8.0) (api 30 for google store)
    * scripting backend : IL2CPP
    * target architecture: check ARM64, uncheck ARMv7
  * get phone to developer mode, and enable usb debug mode, connect usb to your PC;
  * in build setting: Run Device > click refresh to get your phone to show up
  * set allow in phone, and click Build and Run to get it build and load into your phone and run directly.

====== Vuforia Base Setup ======

  * delete default scene camera, add new AR Camera from vuforia
  * in camera attribute, click vuforia configuration, and paste your license code there
  * in "max simultaneous tracked image", set to 2 if you want to 2 mark to show 3d object, (2 mark in real life case)
  * in scene, create ImageTarget object, and put your 3d object as child of it.
  * then, build and run.

Extra ImageTarget setting:
  * Observer event handler:
    * tracked: once track disappear, object disappear (good for book flip, since content should go once track mark is gone)
    * tracked or extended tracked: once tracked disappear, object will stay in last tracked place (good for object showcase)
  * smooth transition on pose jump (if checked):
    * smooth update action on object position (so it will move slowly to new updated track position)

====== Vuforia markless Setup ======

  * add AR Camera, Ground Plane Stage, Plane Finder
  * put your object as child of Ground Plane Stage
  * now done.

Customize:
  * Plane Finder: > Content Positioning Behavior (script)
    * option 1: duplicate stage checked > it will place multi copy when click
    * option 2: duplicate stage unchecked > it will show one copy and it will update position when click
    * option 3: on Content placed (new function) plane Finder > gameObject.setActive (only first click)
  * floor indicator customize:
    * Plane Finder > PlaneFinderBehavior (script) > Plane indicator: make your copy of DefaultPlaneIndicator prefab