Hololens anchor使用与共享

原创文档，转载请注明地址http://blog.csdn.net/fdbvm/article/details/79324718

hololens中anchor代表空间坐标的一个锚点，当给gameobject增加一个WorldAnchor时，相当于把这个物体固定在该位置，将无法移动和旋转该物体。

创建anchor： gameObject.AddComponent<WorldAnchor>();

销毁anchor： Destroy( transform.GetComponent<WorldAnchor>());

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anchorStore 用来将anchor信息在该设备中存储起来，以便下次再次通过周围空间信息识别出这个anchor的时候来使用

anchorStore 初始化：

   private void Start()
    {
        WorldAnchorStore.GetAsync(StoreLoaded);
    }

    private void StoreLoaded(WorldAnchorStore store)
    {
        this.anchorStore = store;
    }

启动的时候从设备将anchorStore重新加载出来，从而复用之前已经保存好的anchor信息

anchorStore中添加anchor: 

anchorStore.Save(exportingAnchorName, transform.GetComponent<WorldAnchor>());

从anchorstore中加载anchor到指定gameobject上：anchorStore.Load(exportingAnchorName, gameObject);

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原创文档，转载请注明地址 http://blog.csdn.net/fdbvm/article/details/79324718

anchor可以在多个设备间共享，来使得不同设备可以使用相同的空间位置，可以通过WorldAnchorTransferBatch将anchor信息导出为byte数组，在另外一台设备中加载这个数组并重新还原出anchor信息

导出代码如下：

 private List<byte> exportingAnchorBytes = new List<byte>();

            WorldAnchorTransferBatch transferBatch = new WorldAnchorTransferBatch();
            transferBatch.AddWorldAnchor(exportingAnchorName, transform.GetComponent<WorldAnchor>());
            WorldAnchorTransferBatch.ExportAsync(transferBatch, OnExportDataAvailable, OnExportComplete);

    private void OnExportComplete(SerializationCompletionReason completionReason)
    {
        if (completionReason != SerializationCompletionReason.Succeeded)
        {
            Debug.Log("share anchor complete");
        }
        else
        { }
    }

    private void OnExportDataAvailable(byte[] data)
    {
        exportingAnchorBytes.AddRange(data);
    }

导入代码如下：

WorldAnchorTransferBatch.ImportAsync(exportingAnchorBytes.ToArray(), OnImportComplete);

  int retryCount = 5;
    private void OnImportComplete(SerializationCompletionReason completionReason, WorldAnchorTransferBatch deserializedTransferBatch)
    {
        if (completionReason != SerializationCompletionReason.Succeeded)
        {
            Debug.Log("Failed to import: " + completionReason.ToString());
            if (retryCount > 0)
            {
                retryCount--;
                WorldAnchorTransferBatch.ImportAsync(exportingAnchorBytes.ToArray(), OnImportComplete);
            }
            return;
        }
       
        string[] ids = deserializedTransferBatch.GetAllIds();
        Debug.Log("load anchor count " + ids.Length);
        foreach (string id in ids)
        {
            Debug.Log("load anchor "+id);
            if (cubeTransform.gameObject != null&&id.Equals(exportingAnchorName))
            {
                Debug.Log("find anchor form share");
                if (cubeTransform.GetComponent<WorldAnchor>() == null) cubeTransform.gameObject.AddComponent<WorldAnchor>();
                deserializedTransferBatch.LockObject(id, cubeTransform.gameObject);
                return;
            }
        }
    }