Fader

using UnityEngine;
using System.Collections;

public class Fader : MonoBehaviour
{
public Texture2D fadeOutTexture;
public float fadeSpeed = 0.8f;

private int drawDepth = -1000;
private float alpha = 1.0f;
private int fadeDir = -1;


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 = drawDepth;
GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height),fadeOutTexture);
}

public float BeginFade (int direction)

{

fadeDir = direction;
return fadeSpeed;

}

void OnLevelWasLoaded()

{

BeginFade(-1);

}

}