unity调用hololens2原生功能

Unity可以通过使用Windows Mixed Reality提供的API来调用Hololens 2的原生功能。以下是一些常见的Hololens 2原生功能及其在Unity中的调用方法：

1. 空间映射：使用Spatial Mapping API获取Hololens 2周围的物理空间信息。可以使用Unity的Spatial Mapping组件来呈现空间网格。要使用Spatial Mapping API，请在Unity中导入Windows Mixed Reality插件并使用以下代码：

using UnityEngine;
using UnityEngine.XR.WSA;

public class SpatialMappingExample : MonoBehaviour
{
    private void Start()
    {
        SurfaceObserver.Start();
    }

    private void Update()
    {
        foreach (var surface in SurfaceObserver.GetSurfaceInfos())
        {
            // Do something with the surface
        }
    }

    private void OnDestroy()
    {
        SurfaceObserver.Stop();
    }
}

2. 语音识别：使用Speech Recognition API在Hololens 2上进行语音识别。可以使用Unity的Text-to-Speech插件来呈现语音识别结果。要使用Speech Recognition API，请在Unity中导入Windows Mixed Reality插件并使用以下代码：

using UnityEngine;
using UnityEngine.XR.WSA.Input;

public class SpeechRecognitionExample : MonoBehaviour
{
    private KeywordRecognizer recognizer;

    private void Start()
    {
        recognizer = new KeywordRecognizer(new string[] { "hello", "world" });
        recognizer.OnPhraseRecognized += Recognizer_OnPhraseRecognized;
        recognizer.Start();
    }

    private void Recognizer_OnPhraseRecognized(PhraseRecognizedEventArgs args)
    {
        // Do something with the recognized phrase
    }

    private void OnDestroy()
    {
        recognizer.Stop();
    }
}

3. 空间音效：使用Spatial Sound API在Hololens 2周围的物理空间中呈现3D音效。可以使用Unity的Audio Source组件来播放空间音效。要使用Spatial Sound API，请在Unity中导入Windows Mixed Reality插件并使用以下代码：

using UnityEngine;
using UnityEngine.XR.WSA.Audio;

public class SpatialSoundExample : MonoBehaviour
{
    private AudioSource source;

    private void Start()
    {
        source = gameObject.AddComponent<AudioSource>();
        source.spatialize = true;
        source.spatialBlend = 1;
        source.Play();
    }

    private void Update()
    {
        var headPosition = Camera.main.transform.position;
        var soundPosition = headPosition + Camera.main.transform.forward * 2;
        source.transform.position = soundPosition;
    }
}

以上是一些常见的Hololens 2原生功能及其在Unity中的调用方法。要使用这些API，请在Unity中导入Windows Mixed Reality插件并参考Windows Mixed Reality文档。