What's new in version 6.6

This release includes the following significant changes:

XRSubsystem

  • Added a new XRSubsystem base class that enables providers to incorporate permissions and asynchronous resource creation into their Start logic. If you are the owner of a subsystem or provider type, Unity recommends that you inherit the new base class instead of SubsystemWithProvider.
  • Changed SubsystemLifecycleManager.Start logic to be compatible with the new XRSubsystem base class. This is a backwards-compatible change, so Manager components still support SubsystemWithProvider as the subsystem base class as well.
  • Reverted a previous change to SubsystemLifecycleManager.OnEnable, which allowed the manager component to poll for subsystems that weren't synchronously available. With the addition of XRSubsystem, all providers are now expected to create subsystems synchronously during XRLoader.Initialize.

Other API additions

  • Added a ToString override for ARMarker.
  • Added XRRaycastSubsystemDescriptor.Cinfo.supportedTrackableTypesDelegate, which allows a raycast provider to determine at runtime which trackable types it supports.
  • Added XRAnchorSubsystemDescriptor.Cinfo.supportsTrackableAttachmentsDelegate, a Func<bool> delegate that allows providers to evaluate trackable attachment support dynamically at runtime.

UI changes

  • Added support for Apple visionOS to the Build AssetBundles window (Assets > AR Foundation > Build AssetBundles).

Deprecations

  • Deprecated XRPlaneSubsystem.CreateOrResizeNativeArrayIfNecessary<T> and XRPlaneSubsystem.Provider.CreateOrResizeNativeArrayIfNecessary<T>. Use NativeArrayUtils instead.
  • Deprecated XRRaycastSubsystemDescriptor.Cinfo.supportedTrackableTypes. Use XRRaycastSubsystemDescriptor.Cinfo.supportedTrackableTypesDelegate instead.
  • Deprecated XRAnchorSubsystemDescriptor.Cinfo.supportsTrackableAttachments. Use supportsTrackableAttachmentsDelegate instead.

For a full list of changes in this version including backwards-compatible bugfixes, refer to the package changelog.