基于ARFoundation的AR应用获取Tracking状态

AR应用时常需要根据tracking状态做出响应，比如在跟踪丢失的时候提示用户从新进行定位。这就需要AR工程内提供一个专门负责跟踪tracking状态的类。通过 ARFoundation提供的ARSession类可以获取到跟踪的状态

废话不多说，直接上代码:

using UnityEngine;
using UnityEngine.XR.ARFoundation;
using UnityEngine.XR.ARSubsystems;

public class ARStatusManager : MonoBehaviour
{
    
    private void OnEnable()
    {
        ARSession.stateChanged += OnStateChanged;
    }
    private void OnDisable()
    {
        ARSession.stateChanged -= OnStateChanged;
    }

    private void OnStateChanged(ARSessionStateChangedEventArgs args)
    {
        switch (args.state)
        {
            case ARSessionState.None:
                break;
            case ARSessionState.CheckingAvailability:
                break;
            case ARSessionState.Installing:
                break;
            case ARSessionState.NeedsInstall:
                break;
            case ARSessionState.Ready:
                break;
            case ARSessionState.SessionInitializing:
                break;
            case ARSessionState.SessionTracking:
                break;
            case ARSessionState.Unsupported:
                break;
        }

        switch (ARSession.notTrackingReason)
        {
            case NotTrackingReason.None:
                break;
            case NotTrackingReason.Initializing:
                break;
            case NotTrackingReason.Relocalizing:
                break;
            case NotTrackingReason.InsufficientLight:
                break;
            case NotTrackingReason.InsufficientFeatures:
                break;
            case NotTrackingReason.ExcessiveMotion:
                break;
            case NotTrackingReason.Unsupported:
                break;
        }
    }

}