Informs the delegate of changes to the quality of ARKit's device position tracking.
- iOS 11.0+
The session providing information.
ARKit tracks the position and orientation of the device relative to a virtual scene through a combination of motion sensing and image processing. As such, factors that affect signal quality from the device's motion sensing hardware or that interfere with scene detection in the camera image can result in poor estimates of the device position relative to the virtual scene.