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Assets/Pixel3D/Scripts/SceneColorSetup.cs

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+/*
+Copies the camera buffer after rendering opaques, to _CameraOpaqueTexture property so the Scene Color node can work in the Built-in RP.
+Attach this script to the Main Camera (and any other cameras you want an Opaque Texture for)
+Will also work for Scene Views (Though if a new window is opened will need to enter & exit play mode)
+Tested in 2022.2
+@Cyanilux
+*/
+
+using UnityEngine;
+using UnityEngine.Rendering;
+
+[ExecuteAlways]
+public class SceneColorSetup : MonoBehaviour
+{
+
+    private Camera cam;
+    private CommandBuffer cmd, cmd2;
+
+    void OnEnable()
+    {
+        cam = GetComponent<Camera>();
+        int rtID = Shader.PropertyToID("_CameraOpaqueTexture");
+        if (cmd == null)
+        {
+            cmd = new CommandBuffer
+            {
+                name = "Setup Opaque Texture"
+            };
+            cmd.GetTemporaryRT(rtID, cam.pixelWidth, cam.pixelHeight, 0);
+            // cmd.Blit(null, rtID);
+        }
+        if (cmd2 == null)
+        {
+            cmd2 = new CommandBuffer
+            {
+                name = "Release Opaque Texture"
+            };
+            cmd2.ReleaseTemporaryRT(rtID);
+        }
+
+        // Game View (camera script is assigned on)
+        cam.AddCommandBuffer(CameraEvent.AfterForwardOpaque, cmd);
+        cam.AddCommandBuffer(CameraEvent.AfterEverything, cmd2);
+
+        // Scene View
+#if UNITY_EDITOR
+        if (cam.tag == "MainCamera")
+        {
+            Camera[] sceneCameras = UnityEditor.SceneView.GetAllSceneCameras();
+            foreach (Camera c in sceneCameras)
+            {
+                c.AddCommandBuffer(CameraEvent.AfterForwardOpaque, cmd);
+                c.AddCommandBuffer(CameraEvent.AfterEverything, cmd2);
+            }
+        }
+#endif
+    }
+
+    void OnDisable()
+    {
+        // Game View (camera script is assigned on)
+        cam.RemoveCommandBuffer(CameraEvent.AfterForwardOpaque, cmd);
+        cam.RemoveCommandBuffer(CameraEvent.AfterEverything, cmd2);
+
+        // Scene View
+#if UNITY_EDITOR
+        if (cam.tag == "MainCamera")
+        {
+            Camera[] sceneCameras = UnityEditor.SceneView.GetAllSceneCameras();
+            foreach (Camera c in sceneCameras)
+            {
+                c.RemoveCommandBuffer(CameraEvent.AfterForwardOpaque, cmd);
+                c.RemoveCommandBuffer(CameraEvent.AfterEverything, cmd2);
+            }
+        }
+#endif
+    }
+}