Reference gameobject to a prefab script

Hello All,

I have a portal that is instantiated into a scene after a switch is turned on, and that portal takes the player to the next scene. i also have a scene fader as a gameobject and a prefab but in my portal script it is referenced as public and i have to drag the gameobject to the script.

my question is, how do i reference the scene fader without having to drag it in the loadnextlevel script on my portal ?

here are my scripts for both if that can help :

for the portal (LoadNewLevel) :

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.SceneManagement;
4.  
5. public class LoadNewLevel : MonoBehaviour
6. {
7.  
8.     public string Level;
9.     public SceneFader sceneFader;
10.     void OnTriggerEnter(Collider other)
11.     {
12.         if (other.gameObject.tag == "Player")
13.         {
14.             Invoke("LoadNextLevel", 1.5f);
15.         }
16.  
17.     }
18.  
19.     public void LoadNextLevel()
20.     {
21.         sceneFader.FadeTo(Level);
22.         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
23.     }
24. }

and for the SceneFader :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5. using UnityEngine.SceneManagement;
6.  
7. public class SceneFader : MonoBehaviour {
8.  
9.     public Image img;
10.     public AnimationCurve curve;
11.  
12.     private void Start()
13.     {
14.         StartCoroutine(FadeIn());
15.     }
16.  
17.     public void FadeTo (string scene)
18.     {
19.         StartCoroutine(FadeOut(scene));
20.     }
21.  
22.     IEnumerator FadeIn()
23.     {
24.         float t = 1f;
25.         while (t > 0f)
26.         {
27.             t -= Time.deltaTime;
28.             float a = curve.Evaluate(t);
29.             img.color = new Color (0f, 0f, 0f, a);
30.             yield return 0;
31.         }
32.  
33.     }
34.  
35.     IEnumerator FadeOut(string scene)
36.     {
37.         float t = 0f;
38.         while (t < 1f)
39.         {
40.             t += Time.deltaTime;
41.             float a = curve.Evaluate(t);
42.             img.color = new Color(0f, 0f, 0f, a);
43.             yield return 0;
44.         }
45.  
46.         SceneManager.LoadScene(scene);
47.     }
48.  
49. }
50.