【HoloLens2 MRTK】SceneUnderstandingで設定したオブジェクト作られる際のイベント取得

using Microsoft.MixedReality.Toolkit.Examples.Demos;
using Microsoft.MixedReality.Toolkit.Experimental.SpatialAwareness;
using Microsoft.MixedReality.Toolkit.SpatialAwareness;
using UnityEngine;

public class SceneUnderstandingController : DemoSpatialMeshHandler, IMixedRealitySpatialAwarenessObservationHandler<SpatialAwarenessSceneObject>
{
    protected override void Start()
    {
    }

     protected override void OnEnable()
    {
        RegisterEventHandlers<IMixedRealitySpatialAwarenessObservationHandler<SpatialAwarenessSceneObject>, SpatialAwarenessSceneObject>();
    }

    protected override void OnDisable()
    {
        UnregisterEventHandlers<IMixedRealitySpatialAwarenessObservationHandler<SpatialAwarenessSceneObject>, SpatialAwarenessSceneObject>();
    }

    protected override void OnDestroy()
    {
        UnregisterEventHandlers<IMixedRealitySpatialAwarenessObservationHandler<SpatialAwarenessSceneObject>, SpatialAwarenessSceneObject>();
    }

    public void OnObservationAdded(MixedRealitySpatialAwarenessEventData<SpatialAwarenessSceneObject> eventData)
    {
        Debug.Log("added!!");
        Debug.Log(eventData);
    }

    public void OnObservationUpdated(MixedRealitySpatialAwarenessEventData<SpatialAwarenessSceneObject> eventData)
    {
    }

    public void OnObservationRemoved(MixedRealitySpatialAwarenessEventData<SpatialAwarenessSceneObject> eventData)
    {
        Debug.Log("removed!!");
        Debug.Log(eventData);
    }

}

#region アセンブリ Microsoft.MixedReality.Toolkit.Examples, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
// C:\Users\Honeycomb-lab\Documents\ono\LIXIL_holo2\LIXLI_holo2\Library\ScriptAssemblies\Microsoft.MixedReality.Toolkit.Examples.dll
#endregion

using Microsoft.MixedReality.Toolkit.SpatialAwareness;
using UnityEngine;
using UnityEngine.EventSystems;

namespace Microsoft.MixedReality.Toolkit.Examples.Demos
{
    [AddComponentMenu("Scripts/MRTK/Examples/DemoSpatialMeshHandler")]
    public class DemoSpatialMeshHandler : MonoBehaviour, IMixedRealitySpatialAwarenessObservationHandler<SpatialAwarenessMeshObject>, IEventSystemHandler
    {
        protected bool isRegistered;

        public DemoSpatialMeshHandler();

        public virtual void OnObservationAdded(MixedRealitySpatialAwarenessEventData<SpatialAwarenessMeshObject> eventData);
        public virtual void OnObservationRemoved(MixedRealitySpatialAwarenessEventData<SpatialAwarenessMeshObject> eventData);
        public virtual void OnObservationUpdated(MixedRealitySpatialAwarenessEventData<SpatialAwarenessMeshObject> eventData);
        protected void AddToData(int eventDataId);
        protected virtual void OnDestroy();
        protected virtual void OnDisable();
        protected virtual void OnEnable();
        protected virtual void RegisterEventHandlers<T, U>()
            where T : IMixedRealitySpatialAwarenessObservationHandler<U>
            where U : BaseSpatialAwarenessObject;
        protected void RemoveFromData(int eventDataId);
        protected virtual void Start();
        protected virtual void UnregisterEventHandlers<T, U>()
            where T : IMixedRealitySpatialAwarenessObservationHandler<U>
            where U : BaseSpatialAwarenessObject;
        protected void UpdateData(int eventDataId);
    }
}