【Unity】Unityでトランジションを使ったフェードイン・アウトでシーン推移する方法　第一回

using UnityEngine;
using System.Collections;
using UnityEngine.Assertions;

public class Fade : MonoBehaviour
{
	IFade fade;
	[SerializeField] bool startFade;

	void Start ()
	{
		Init ();
		fade.Range = cutoutRange;
	}

	float cutoutRange;

	void Init ()
	{
		if (startFade)
		{
			cutoutRange = 1;
		}
		fade = GetComponent<IFade> ();
	}

	void OnValidate ()
	{
		Init ();
		fade.Range = cutoutRange;
	}

	IEnumerator FadeoutCoroutine (float time, System.Action action)
	{
		float endTime = Time.timeSinceLevelLoad + time * (cutoutRange);

		var endFrame = new WaitForEndOfFrame ();

		while (Time.timeSinceLevelLoad <= endTime) {
			cutoutRange = (endTime - Time.timeSinceLevelLoad) / time;
			fade.Range = cutoutRange;
			yield return endFrame;
		}
		cutoutRange = 0;
		fade.Range = cutoutRange;

		if (action != null) {
			action ();
		}
	}

	IEnumerator FadeinCoroutine (float time, System.Action action)
	{
		float endTime = Time.timeSinceLevelLoad + time * (1 - cutoutRange);
		
		var endFrame = new WaitForEndOfFrame ();

		while (Time.timeSinceLevelLoad <= endTime) {
			cutoutRange = 1 - ((endTime - Time.timeSinceLevelLoad) / time);
			fade.Range = cutoutRange;
			yield return endFrame;
		}
		cutoutRange = 1;
		fade.Range = cutoutRange;

		if (action != null) {
			action ();
		}
	}

	public Coroutine FadeOut (float time, System.Action action)
	{
		StopAllCoroutines ();
		return StartCoroutine (FadeoutCoroutine (time, action));
	}

	public Coroutine FadeOut (float time)
	{
		return FadeOut (time, null);
	}

	public Coroutine FadeIn (float time, System.Action action)
	{
		StopAllCoroutines ();
		return StartCoroutine (FadeinCoroutine (time, action));
	}

	public Coroutine FadeIn (float time)
	{
		return FadeIn (time, null);
	}
}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

[RequireComponent (typeof(RawImage))]
[RequireComponent (typeof(Mask))]
public class FadeUI : UnityEngine.UI.Graphic, IFade
{
	[SerializeField]
	private Texture maskTexture = null;

	[SerializeField, Range(0, 1)]
	private float cutoutRange;

	protected override void Start()
	{
		base.Start();
		UpdateMaskTexture(maskTexture);
	}

	public void UpdateMaskTexture(Texture texture)
	{
		material.SetTexture("_MaskTex", texture);
		material.SetColor("_Color", color);
	}

	public float Range {
		get {
			return cutoutRange;
		}
		set {
			cutoutRange = value;
			UpdateMaskCutout (cutoutRange);
		}
	}

	[SerializeField] Material mat = null;
	[SerializeField] RenderTexture rt = null;

	[SerializeField] Texture texture = null;

	private void UpdateMaskCutout (float range)
	{
		mat.SetFloat ("_Range", range);
		
		UnityEngine.Graphics.Blit (texture, rt, mat);
		
		var mask = GetComponent<Mask> ();
		mask.enabled = false;
		mask.enabled = true;
	}
#if UNITY_EDITOR
	protected override void OnValidate()
	{
		base.OnValidate();
		UpdateMaskCutout(Range);
		UpdateMaskTexture(maskTexture);
	}
#endif


}

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

public class FadeIn : MonoBehaviour
{
    [SerializeField] Fade fade;
    public void NextScene()
    {
        Action act = () => SceneManager.LoadScene("scene2");
        float time = 1f;

        //1秒間フェードしてからにシーン移動する
        fade.FadeIn(time, act);
    }
}

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

public class FadeOut : MonoBehaviour
{
    [SerializeField] Fade fade;
    // Start is called before the first frame update
    void Start()
    {
        float time = 1f;

        //1秒間フェードしてからにシーン移動する
        fade.FadeOut(time);
    }
}