public void ToggleAnchorPersistence(ARAnchor anchor)
{
if (m_anchorStore == null)
{
Debug.Log($"Anchor Store was not available.");
return;
}
SampleAnchor sampleAnchor = anchor.GetComponent <SampleAnchor>();
if (!sampleAnchor.Persisted)
{
// For the purposes of this sample, randomly generate a name for the saved anchor.
string newName = $"anchor/{Guid.NewGuid().ToString().Substring(0, 4)}";
bool succeeded = m_anchorStore.TryPersistAnchor(anchor.trackableId, newName);
if (!succeeded)
{
Debug.Log($"Anchor could not be persisted: {anchor.trackableId}");
return;
}
ChangeAnchorVisual(anchor, newName, true);
}
else
{
m_anchorStore.UnpersistAnchor(sampleAnchor.Name);
ChangeAnchorVisual(anchor, "", false);
}
}
/// <summary>
/// Steps to show problem with XRAnchorStore.Clear()
/// </summary>
/// <param name="anchorStore">An empty XRAnchorStore</param>
/// <param name="anchorTrackableId">TrackableId for an ARAnchor</param>
private static void TestAnchorStore(XRAnchorStore anchorStore, TrackableId anchorTrackableId)
{
string anchorName = "Anchor0";
// Add the anchor to the anchorStore. Since anchorStore is empty, this succeeds.
anchorStore.TryPersistAnchor(anchorTrackableId, anchorName);
// Add the anchor again. Since it is already in the anchorStore, this fails with error message emitted.
// This is correct and expected.
anchorStore.TryPersistAnchor(anchorTrackableId, anchorName);
// [XR] [Mixed Reality OpenXR Anchor]: Could not persist anchor "Anchor0"; name already used in anchor store.
// Clear the anchorStore.
anchorStore.Clear();
// It seems to have cleared everything, because the anchorStore.PersistedAnchorNames.Count == 0 now.
// But attempting to persist Anchor0 again will still result in the same error.
// INCORRECT HERE.
anchorStore.TryPersistAnchor(anchorTrackableId, anchorName);
// [XR] [Mixed Reality OpenXR Anchor]: Could not persist anchor "Anchor0"; name already used in anchor store.
// Now Un-persist the anchor.
anchorStore.UnpersistAnchor(anchorName);
// Persisting it now seems to succeed (or at least generates no error message.)
anchorStore.TryPersistAnchor(anchorTrackableId, anchorName);
}