private static void _user_anchor_added(UnityARUserAnchorData anchor)
{
if (UnityARSessionNativeInterface.ARUserAnchorAddedEvent != null)
{
ARUserAnchor userAnchorFromAnchorData = GetUserAnchorFromAnchorData(anchor);
UnityARSessionNativeInterface.ARUserAnchorAddedEvent(userAnchorFromAnchorData);
}
}