Import Unity Project

Assets/Scripts/RenderManager.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class RenderManager : MonoBehaviour
+{
+    public RenderTexture outTexture;
+    public string outPath;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        if(Time.frameCount > 10) {
+            SaveRenderTexture(outTexture, outPath + Time.frameCount + "-" + Time.realtimeSinceStartup + ".png");
+        }
+
+        if(Time.frameCount > 20) {
+            Debug.Log("QUIT");
+            Application.Quit();
+        }
+    }
+    static void SaveRenderTexture(RenderTexture rt, string path)
+    {
+        RenderTexture.active = rt;
+        Texture2D tex = new Texture2D(rt.width, rt.height, TextureFormat.RGB24, false);
+        tex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
+        RenderTexture.active = null;
+        var bytes = tex.EncodeToPNG();
+        System.IO.File.WriteAllBytes(path, bytes);
+        Debug.Log($"Saved texture: {rt.width}x{rt.height} - " + path);
+    }
+}

Assets/Scripts/RenderManager.cs.meta

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+guid: 5204f46d10deb2b4a916f14c25a6f201
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: