五，遊戲控制器  主要：記錄主角最後出現的位置
1，建立空物件，命名為gameController，設定tag，gameController，將audio中的music_normal拖入音訊剪輯中（這是正常遊戲音樂背景），勾選paly
   on awake，loop
2，在gameController下建立空的子物件，命名為secondaryMusic，拖進去music_panic音訊，勾選loop，設定volume為0 （玩家被發現時音樂背景）

3，為gameController新增指令碼DoneLastPlayerSighting

using UnityEngine;
using System.Collections;

public class DoneLastPlayerSighting : MonoBehaviour
{
    public Vector3 position = new Vector3(1000f, 1000f, 1000f);			// The last global sighting of the player.
	public Vector3 resetPosition = new Vector3(1000f, 1000f, 1000f);	// The default position if the player is not in sight.
	public float lightHighIntensity = 0.25f;							// The directional light's intensity when the alarms are off.
	public float lightLowIntensity = 0f;								// The directional light's intensity when the alarms are on.
	public float fadeSpeed = 7f;										// How fast the light fades between low and high intensity.
	public float musicFadeSpeed = 1f;									// The speed at which the 
	
	
	private DoneAlarmLight alarm;										// Reference to the AlarmLight script.
	private Light mainLight;											// Reference to the main light.
	private AudioSource panicAudio;										// Reference to the AudioSource of the panic msuic.
	private AudioSource[] sirens;										// Reference to the AudioSources of the megaphones.
	
	
	void Awake ()
	{
		// Setup the reference to the alarm light.
		alarm = GameObject.FindGameObjectWithTag(DoneTags.alarm).GetComponent<DoneAlarmLight>();
		
		// Setup the reference to the main directional light in the scene.
		mainLight = GameObject.FindGameObjectWithTag(DoneTags.mainLight).light;
		
		// Setup the reference to the additonal audio source.
		panicAudio = transform.FindChild("secondaryMusic").audio;
		
		// Find an array of the siren gameobjects.
		GameObject[] sirenGameObjects = GameObject.FindGameObjectsWithTag(DoneTags.siren);
		
		// Set the sirens array to have the same number of elements as there are gameobjects.
		sirens = new AudioSource[sirenGameObjects.Length];
		
		// For all the sirens allocate the audio source of the gameobjects.
		for(int i = 0; i < sirens.Length; i++)
		{
			sirens[i] = sirenGameObjects[i].audio;
		}
	}
	
	
	void Update ()
	{
		// Switch the alarms and fade the music.
		SwitchAlarms();
		MusicFading();
	}
	
	
	void SwitchAlarms ()
	{
		// Set the alarm light to be on or off.
		alarm.alarmOn = (position != resetPosition);
		
		// Create a new intensity.
		float newIntensity;
		
		// If the position is not the reset position...
		if(position != resetPosition)
			// ... then set the new intensity to low.
			newIntensity = lightLowIntensity;
		else
			// Otherwise set the new intensity to high.
			newIntensity = lightHighIntensity;
		
		// Fade the directional light's intensity in or out.
		mainLight.intensity = Mathf.Lerp(mainLight.intensity, newIntensity, fadeSpeed * Time.deltaTime);
		
		// For all of the sirens...
		for(int i = 0; i < sirens.Length; i++)
		{
			// ... if alarm is triggered and the audio isn't playing, then play the audio.
			if(position != resetPosition && !sirens[i].isPlaying)
				sirens[i].Play();
			// Otherwise if the alarm isn't triggered, stop the audio.
			else if(position == resetPosition)
				sirens[i].Stop();
		}
	}
	
	
	void MusicFading ()
	{
		// If the alarm is not being triggered...
		if(position != resetPosition)
		{
			// ... fade out the normal music...
			audio.volume = Mathf.Lerp(audio.volume, 0f, musicFadeSpeed * Time.deltaTime);
			
			// ... and fade in the panic music.
			panicAudio.volume = Mathf.Lerp(panicAudio.volume, 0.8f, musicFadeSpeed * Time.deltaTime);
		}
		else
		{
			// Otherwise fade in the normal music and fade out the panic music.
			audio.volume = Mathf.Lerp(audio.volume, 0.8f, musicFadeSpeed * Time.deltaTime);
			panicAudio.volume = Mathf.Lerp(panicAudio.volume, 0f, musicFadeSpeed * Time.deltaTime);
		}
	}
}
 

變數：敵人或攝像機最後發現玩家的位置 （3個1000f是代表不存在的座標，AI不知道主角的位置，AI得不到主角的座標會將值設為這個）
      重置主角座標點為預設座標，即玩家沒有被發現
      兩個分別為主光線的最大，最小強度
      光線強度變化速率
      背景音樂切換速率


      警報光線指令碼引用
      主光燈引用
      恐怖音樂元件引用
      警報喇叭陣列


函式：awake()，設定alarm指令碼DoneAlarmLight  通過tag獲得物件，再獲得其元件指令碼檔案DoneAlarmLight  
      設定主光線  通過tag獲得物件，通過快捷方式獲得該元件引用
      設定恐怖音樂元件  通過transform.FindChild查詢子元素物件，然後再通過快捷方式獲得該元件引用
      獲得警報喇叭的陣列 通過該標籤獲得該物件存入陣列
      建立siren陣列，長度與上面陣列一致 
      
      依次獲取sirenGameObjects中的AudioSource元件存入siren陣列中


      Update()，呼叫切換警報光和音樂切換函式


      SwitchAlarms (),切換警報光函式
      通過玩家當前位置和重置位置的比較設定是否開警報燈
根據當前位置與重置位置的關係（不相等即玩家暴露）設定新的主光的強度，然後平滑的變化到新的光強
對於所有警報燈，若玩家暴露且沒開，那就開；玩家沒暴露，就關

      MusicFading()
玩家暴露時，背景音樂變0，恐怖音效變大；否則，反之


最後將gameController拖入prefab中
到此，可以執行一下感受詭異的氣氛。。。