Setup _CameraOpaqueTexture (for Scene Color node) in Unity's Built-in Render Pipeline (BiRP)

SceneColorSetup.cs

/*
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;
#if UNITY_EDITOR
using UnityEditor;
#endif

[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();
            cmd.name = "Setup Opaque Texture";
            cmd.GetTemporaryRT(rtID, cam.pixelWidth, cam.pixelHeight, 0);
            cmd.Blit(null, rtID);
        }
        if (cmd2 == null){
            cmd2 = new CommandBuffer();
            cmd2.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
    }
}