Add pingpong fade

Assets/Scripts/GameManager.cs

@@ -1,12 +1,19 @@
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
+using UnityEngine.UI;
 
 public class GameManager : MonoBehaviour
 {
     public static GameManager Instance;
-
+    public Image fadeRect;
     public DialogueController dialogueController;
+
+    [SerializeField] private float m_fadeT;
+    private float m_fadeTotal;
+    [SerializeField] private bool m_showFade = false;
+    [SerializeField] private float m_fadeDuration = 1;
+
     private void Awake()
     {
         if (Instance == null)
@@ -19,5 +26,38 @@ public class GameManager : MonoBehaviour
         }
     }
 
+    private void Update()
+    {
+        //Fade image towrads target
+        if(m_showFade)
+        {
+            if (m_fadeTotal < m_fadeDuration / 2)
+            {
+                m_fadeT += Time.deltaTime;
+            } else
+            {
+                m_fadeT -= Time.deltaTime;
+            }
+            m_fadeTotal += Time.deltaTime;
+            
+            
+            if(m_fadeT < 0)
+            {
+                m_showFade = false;
+                m_fadeT = 0;
+                m_fadeTotal = 0;
+            }
 
+            fadeRect.color = new Color(0f, 0f, 0f, Mathf.Lerp(0, 1, m_fadeT));
+        }
+
+        
+
+    }
+
+    public void FadePingPong()
+    {
+        m_fadeTotal = 0;
+        m_showFade = true;
+    }
 }