com.unity.xr.arcore 6.1.0-pre.1 Package Notes

Added documentation to feature manual pages that demonstrates how to extend AR Foundation by marshaling native pointers to your custom C++ plug-ins.
Added [ARCoreEnvironmentProbeSubsystem](xref:UnityEngine.XR.ARCore.ARCoreEnvironmentProbeSubsystem) and [ARCoreOcclusionSubsystem](xref:UnityEngine.XR.ARCore.ARCoreOcclusionSubsystem). These classes were previously internal, and are now public.
Added support for camera background rendering with Vulkan Graphics API.
Added three new session subsystem API override methods to the `ARCoreSessionSubsystem` provider class to handle Universal Render Pipeline
rendering events signaled by the `ARCommandBufferSupportRendererFeature` in order to support rendering through the Vulkan Graphics API.
- `ARCoreSessionSubsystem.requiresCommandBuffer`
- `ARCoreSessionSubsystem.OnCommandBufferSupportEnabled`
- `ARCoreSessionSubsystem.OnCommandBufferExecute`

Upgraded ARCore version from 1.42 to 1.45.
Removed the `XROcclusionSubsystem` and the `XREnvironmentProbeSubsystem` from the `ARCoreLoader` when the chosen graphics API is Vulkan, as those subsystems do not have Vulkan rendering support yet.
The `XRCameraSubsystemDescriptor.supportsCameraImage` field is set to **false** when the chosen graphics API is Vulkan, as that feature does not have Vulkan rendering support yet.
Changed documentation for Project Configuration to indicate that the `ARCommandBufferSupportRendererFeature` is required for projects using the Universal Render Pipeline with the Vulkan Graphics API.

Fixed the native input provider so that it now explicitly sets **Device** mode as its only supported [Tracking Origin Mode](xref:Unity.XR.CoreUtils.XROrigin.TrackingOriginMode). The [XR Origin component](xref:xr-core-utils-xr-origin-reference) will always use **Device** mode as its Tracking Origin Mode. You should set the XR Origin component's **Camera Y Offset** value to `0` to avoid adding a height offset to your camera and trackables.
Fixed the `ARCoreSessionSubsystem` so that your app no longer quits unexpectedly if you call `ARSession.Reset` on the same frame that you create a session. (ARFB-461)

com.unity.xr.arcore 6.1.0-pre.1