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Tools/SceneManager/Loader.cs

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+using System;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public static class Loader{
+
+    class LoadingMonoBehaviour : MonoBehaviour { }
+
+    static Action onLoaderCallback;
+    static AsyncOperation loadingAsyncOperation;
+
+    public static void Load(int scene){
+        onLoaderCallback = () => {
+            GameObject loadingGameObject = new GameObject("LoadingGameObject");
+            loadingGameObject.AddComponent<LoadingMonoBehaviour>().StartCoroutine(LoadSceneAsync(scene));
+        };
+
+        SceneManager.LoadScene("Loading");
+    }
+    public static void Load(string scene){
+        onLoaderCallback = () => {
+            GameObject loadingGameObject = new GameObject("LoadingGameObject");
+            loadingGameObject.AddComponent<LoadingMonoBehaviour>().StartCoroutine(LoadSceneAsync(scene));
+        };
+
+        SceneManager.LoadScene("Loading");
+    }
+
+    static IEnumerator LoadSceneAsync(int scene){
+        yield return null;
+        loadingAsyncOperation = SceneManager.LoadSceneAsync(scene);
+
+        while (!loadingAsyncOperation.isDone){
+            yield return null;
+        }
+    }
+    static IEnumerator LoadSceneAsync(string scene){
+        yield return null;
+        loadingAsyncOperation = SceneManager.LoadSceneAsync(scene);
+
+        while (!loadingAsyncOperation.isDone){
+            yield return null;
+        }
+    }
+
+    public static float GetLoadingProgress(){
+        if(loadingAsyncOperation != null){
+            return loadingAsyncOperation.progress;
+        }else{
+            return 0f;
+        }
+    }
+
+    public static void LoaderCallback(){
+        if(onLoaderCallback != null){
+            onLoaderCallback();
+            onLoaderCallback = null;
+        }
+    }
+}

Tools/SceneManager/Loader.cs.meta

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+guid: f063a9d603510c141ab14838d5426a9b
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+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
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Tools/SceneManager/LoaderCallback.cs

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+using UnityEngine;
+
+public class LoaderCallback : MonoBehaviour{
+
+    bool isFirstUpdate = true;
+
+    // Update is called once per frame
+    void Update(){
+        if (isFirstUpdate){
+            isFirstUpdate = false;
+            Loader.LoaderCallback();
+        }
+    }
+}

Tools/SceneManager/LoaderCallback.cs.meta

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+  externalObjects: {}
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Tools/SceneManager/LoadingProgressBar.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+public class LoadingProgressBar : MonoBehaviour{
+
+    Image image;
+
+    // Start is called before the first frame update
+    void Awake(){
+        image = transform.GetComponent<Image>();
+    }
+
+    // Update is called once per frame
+    void Update(){
+        image.fillAmount = Loader.GetLoadingProgress();
+    }
+}

Tools/SceneManager/LoadingProgressBar.cs.meta

@@ -0,0 +1,11 @@
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+guid: 79bedd11df41bee44a527b2e4e718d17
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