ARSubsystems defines an interface, and the platform-specific implementations are in the ARCore and ARKit packages. ARFoundation turns the AR data provided by ARSubsystems into Unity `GameObject`s and `MonoBehavour`s.
The `mater` branch is compatible with Unity 2019.1 and later. For 2018.4, see the [1.5-preview branch](https://github.com/Unity-Technologies/arfoundation-samples/tree/1.5-preview). ARFoundation 1.5 is functionality equivalent to 2.2. The only difference is the version of Unity on which it depends.
The `master` branch is compatible with Unity 2019.1 and later. For 2018.4, see the [1.5-preview branch](https://github.com/Unity-Technologies/arfoundation-samples/tree/1.5-preview). ARFoundation 1.5 is functionality equivalent to 2.2. The only difference is the version of Unity on which it depends.
The `master` branch includes support for ARKit 3, which is still in beta. While ARFoundation and ARSubsystems 2.2 provide interfaces for ARKit 3 features, only Unity's ARKit XR Plugin 2.2 package contains _support_ for these features and _requires_ Xcode 11 beta and iOS 13 beta. Unity's ARKit XR Plugin 2.2 is not backwards compatible with previous versions of Xcode or iOS.
**TL;DR:** If you want to checkout the latest and greatest features in ARKit 3, use this `master` branch, Xcode 11 beta 1, and a device running iOS 13 beta. Otherwise, see the [2.1 branch](https://github.com/Unity-Technologies/arfoundation-samples/tree/2.1), which only lacks support for the new ARKit 3 features.
The `master` branch includes support for ARKit 3, which is still in beta and requires Xcode 11 beta 1 and iOS 13 beta 1. If you try to build the `master` branch with Xcode 10, you will get these linker errors:
If you run these samples on a pre-iOS 13 device, your app will crash on startup with this message:
```
dyld: Symbol not found: _OBJC_CLASS_$_ARMatteGenerator
```
The [2.1 branch](https://github.com/Unity-Technologies/arfoundation-samples/tree/2.1) is compatible with Xcode 9 and 10 and only lacks the new ARKit 3 features.
ARFoundation 2.2 provides interfaces for ARKit 3 features, but only Unity's ARKit XR Plugin 2.2 package contains _support_ for these features and _requires_ Xcode 11 beta 1 and iOS 13 beta 1. Unity's ARKit XR Plugin 2.2 is not backwards compatible with previous versions of Xcode or iOS. Unity's ARKit XR Plugin 2.1 will work with the latest ARFoundation (it just doesn't implement the ARKit 3 features).
While Xcode 11 & iOS 13 are in beta, we will continue to maintain *both* the 2.2 and 2.1 versions of the packages.
The same is also true for Unity's ARKit Face Tracking package 1.1: it _requires_ Xcode 11 beta and iOS 13 beta.
If you want to checkout the latest and greatest features from Apple, use this `master` branch, Xcode 11 beta, and a device running iOS 13 beta. Otherwise, see the [2.1 branch](https://github.com/Unity-Technologies/arfoundation-samples/tree/2.1), which only lacks support for the new ARKit 3 features.
The ARKit XR Plugin version 2.2 is only compatible with Xcode 13 beta 1 and iOS 13 beta 1. Betas 2 and 3 are not yet supported.
Tim Mowrer
5 年前