How to make fade in between scenes automatic when time countdown to zero ?

Questions & Answers
1

I want to know about script when the time countdown to zero then scene1 changed to scene2 with fade in by automatic ?

2

This is the tutorial that i followed to achieve that.

I created another script, called Fading and a function LoadNewLevel. I put that Fading script on a game object in every scene of mine (the scene manager)
This is the entire script :

        public Texture2D fadeOutTexture;
	
	private float fadeSpeed = 1f;
	private float alpha = 1.0f;
	private float fadeDir = -1f;
	
	
	void Awake()
	{
		gameObject.SendMessage("OnLevelWasLoaded",Application.loadedLevel);
	}
	
	void Start()
	{
	}
	
	void OnGUI()
	{
		alpha += fadeDir * fadeSpeed * Time.deltaTime;
		
		alpha = Mathf.Clamp01(alpha);
		
		GUI.color = new Color(GUI.color.r, GUI.color.g, GUI.color.b, alpha);
		GUI.depth = -1000;
		GUI.DrawTexture( new Rect(0,0, Screen.width, Screen.height), fadeOutTexture );
	}
	
	
	public float beginFade(float dir)
	{
		fadeDir = dir;
		return fadeSpeed;
	}
	
	
	void OnLevelWasLoaded ()
	{
		beginFade(-1f);
	}
	
	IEnumerator LoadLevel(string levelName)
	{
	
		float fspeed = beginFade(1f);
		yield return new WaitForSeconds(fspeed);
		
		Application.LoadLevel(levelName);
	}
	
	public void LoadNewLevel(string levelName)
	{
		StartCoroutine( LoadLevel(levelName) );
	}

And on the fadeOutTexture field i drag a simple black texture.

When i want to switch scenes, i find the manager object, get this component and call the loadNewLevel

ex: GameObject.Find(“SceneMaanger”).GetComponent().LoadNewLevel(“Level2”);
insead of using Application.LoadLevel(“Level2”).

This works for me. You can have your own implementation of course.

Regarding the countdown to 0, you can just use Invoke with a parameter

public void fadeToNextLevel()
{
  GameObject.Find("SceneMaanger").GetComponent<Fading>().LoadNewLevel("Level2");
}

//this can be called like this : Invoke("fadeToNextLevel", 2f) //which calls the function after 2 seconds.