public KeyValuePair <int, T> this[MarsTrackableId key]
 {
     get { return(m_Dictionary[key]); }
 }
 public void Remove(MarsTrackableId key)
 {
     m_Dictionary.Remove(key);
 }
 public MRReferencePoint(Pose pose, MARSTrackingState state = MARSTrackingState.Unknown) : this()
 {
     id            = MarsTrackableId.Create();
     trackingState = state;
     this.pose     = pose;
 }