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#define kFPS 60

when i try to put in the AppController.mm    inside the Copiler flag #define kFPS 60

the project failed, where is the rigth place to put #define kFPS 60?

It should be in AppController.mm as indicated by the comments below, taken from a sample file:

 

// kFPS define for removed

i found this script and attach to the ARcamera. Its ok?  Seems to do not difference, on the performace.

is java.

 

 

using UnityEngine;

It is only a suggestion to the Unity engine, so if possible it will try to attain the specified frame rate, if not then it will drop down to something more manageable.

If you want to try and experiment then you could try this with a non-AR scene and explore the findings that you get.