[Part 9.5] Scene doesn’t load because scene fader remains black

[tai]

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Hi, i am trying out the Part 9.5 project files the project worked fine but all the ability is unlock so i delete all the save files in the folder C:\Users\phamh\AppData\LocalLow\DefaultCompany\Metroidvania Tutorial.

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When i reload the project and open from Main Menu scene its normal but when i clicked Play the screen turned black and i can only hear sound in the background as in the video.

I have tried redownload the project files but its not working anymore.

[Terence]

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Can you go to the Build Settings and see if all the Scenes are added in there?

[tai]

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Yes everthing is added.

[Terence]

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That is strange. Try expanding the Cave_1 file in your Scene after loading the new level:

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I suspect the Scene is loading, but the Scene Fader isn’t deactivating so it looks like the scene isn’t loading.

[tai]

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[tai]

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Yesterday, I tried to do part 9 from scratch in another project and it worked fine but I havent done pause menu and audio yet.

[Terence]

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If you are still working on the 9.5 files, try changing the Start() to Awake() in SceneFader and see if it fixes the issue. More information here: https://blog.terresquall.com/community/topic/part-5-article-changes-common-issues-bugfixes/

[tai]

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Here is the SceneFader.cs. It already changed to Awake when i downloaded it.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class SceneFader : MonoBehaviour
{
    public float fadeTime;

    private Image fadeOutUIImage;

    public enum FadeDirection
    {
        In, 
        Out
    }

    // Start is called before the first frame update
    void Awake()
    {
        fadeOutUIImage = GetComponent<Image>();
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    public void CallFadeAndLoadScene(string _sceneToLoad)
    {
        StartCoroutine(FadeAndLoadScene(FadeDirection.In, _sceneToLoad));
    }

    public IEnumerator Fade(FadeDirection _fadeDirection)
    {
        float _alpha = _fadeDirection == FadeDirection.Out ? 1 : 0;
        float _fadeEndValue = _fadeDirection == FadeDirection.Out ? 0 : 1;

        if(_fadeDirection == FadeDirection.Out)
        {
            while(_alpha >= _fadeEndValue)
            {
                SetColorImage(ref _alpha, _fadeDirection);

                yield return null;
            }

            fadeOutUIImage.enabled = false;
        }
        else
        {
            fadeOutUIImage.enabled = true;

            while (_alpha <= _fadeEndValue)
            {
                SetColorImage(ref _alpha, _fadeDirection);

                yield return null;
            }
        }
    }

    public IEnumerator FadeAndLoadScene(FadeDirection _fadeDirection, string _sceneToLoad)
    {
        fadeOutUIImage.enabled = true;

        yield return Fade(_fadeDirection);

        SceneManager.LoadScene(_sceneToLoad);
    }

    void SetColorImage(ref float _alpha, FadeDirection _fadeDirection)
    {
        fadeOutUIImage.color = new Color(fadeOutUIImage.color.r, fadeOutUIImage.color.g, fadeOutUIImage.color.b, _alpha);

        _alpha += 0.02f * (_fadeDirection == FadeDirection.Out ? -1 : 1);
    }
}

[Terence]

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Try adding this line to SceneTransition. That should fix it:

    private void OnTriggerEnter2D(Collider2D _other)
    {
        if (_other.CompareTag("Player"))
        {
            GameManager.Instance.transitionedFromScene = SceneManager.GetActiveScene().name;

            PlayerController.Instance.pState.cutscene = true;
            PlayerController.Instance.pState.invincible = true;
            if(UIManager.Instance.sceneFader == null)
                UIManager.Instance.sceneFader = UIManager.Instance.GetComponentInChildren<SceneFader>();
            StartCoroutine(UIManager.Instance.sceneFader.FadeAndLoadScene(SceneFader.FadeDirection.In, transitionTo));
        }
    }

The problem is likely that UIManager loads after SceneTransition, causing UIManager.Instance.sceneFader to be null and breaking the sceneFader transition.

[tai]

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Tried it but sadly not working. There are still the same error in console.

[Terence]

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Can you show me your UIManager, SceneTransition and SceneFader scripts?

[Terence]

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I found the issue Tai. Check your Pause Menu’s Quit to Main Menu button and make sure you unpause the game when the button is clicked. Otherwise, the game remains paused when you quit and return to the level, causing the screen to remain black.

[Author]

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