Speech-To-Text on Unity

STT.cs

using UnityEngine;
using UnityEngine.UI;

using UnityEngine.Windows.Speech;
using System.Collections.Generic;
using System.Linq;

public class STT : MonoBehaviour
{
	public UnityEngine.UI.Text resultDisplay;
	public UnityEngine.UI.Text TTSDisplay;
	public AudioSource sphere;
	public AudioSource cube;
	public AudioSource what;
	public AudioSource hello;
	public AudioSource goodbye;

	public GameObject gazePoint;

	public GameObject[] gameObjects;

	KeywordRecognizer keywordRecognizer;
	Dictionary<string, System.Action> keywords = new Dictionary<string, System.Action>();

	void Start()
	{

		//キーワード認識器用にキーワードとそれに対するアクションを入力
		keywords.Add("これはなんですか", () =>
			{
				resultDisplay.text = "プレーヤー：これはなんですか";
				GameObject thisObject=null;
				foreach(GameObject gameObject in gameObjects){
					if(isCollision(gameObject.transform.position,gazePoint.transform.position,0.5f)){
						thisObject=gameObject;
					}
				}

				if(thisObject == null){
					what.Play();
					TTSDisplay.text="アリシア：どれのことですか？";
				}else if(thisObject.name == "Boll"){
					sphere.Play();
					TTSDisplay.text="アリシア：これは球です。";
				}else if(thisObject.name == "Box"){
					cube.Play();
					TTSDisplay.text="アリシア：これは立方体です。";
				}
			});
		keywords.Add("こんにちは", () =>
			{
				resultDisplay.text = "プレーヤー：こんにちは";
				hello.Play();
				TTSDisplay.text="アリシア：こんにちは";
			});
		keywords.Add("さようなら", () =>
			{
				resultDisplay.text = "プレーヤー：さようなら。";
				goodbye.Play();
				TTSDisplay.text="アリシア：さようなら。またお会いしましょう。";
			});
		
		keywordRecognizer = new KeywordRecognizer(keywords.Keys.ToArray());
		keywordRecognizer.OnPhraseRecognized += KeywordRecognizer_OnPhraseRecognized;
		keywordRecognizer.Start();
		Debug.Log("Setting done.");
	}

	private bool isCollision(Vector3 a,Vector3 b,float r){
		float x = a.x - b.x;
		float y = a.y - b.y;
		float z = a.z - b.z;

		// on collision
		if (x * x + y * y + z * z < r*r) {
			return true;
		} else {
			return false;
		}
	}

	private void KeywordRecognizer_OnPhraseRecognized(PhraseRecognizedEventArgs args)
	{
		System.Action keywordAction;
		// if the keyword recognized is in our dictionary, call that Action.
		if (keywords.TryGetValue(args.text, out keywordAction))
		{
			keywordAction.Invoke();
		}
	}
}