Basic Command Buffer Question

(It's very frustrating to find step-by-step tutorials about CommandBuffer. Yea, There are lots of example codes and projects out there, but most are only fancy, nothing like a clean "Hello World"...)

What I was attempting is :
1- Simply put few lines in the OnEnable and drag the script to a scene GameObject;
2- Run the game and check if any information shows up in Frame Debugger (the Name of CommandBuffer);
3- If the Name of CommandBuffer is found , It's Hello world!

But in the end, after searching a lot on internet and reading documents, I just couldn't get any thing useful to make it happen.. The CommandBuffer is not listed in the Frame Debugger. And I am not sure if the CommandBuffer was working or not, and Why...Please anyone can give any help, information or advice. Thanks.
(I'm using 2018.4.0f1 LWRP)

Here is the part of code:

Code (CSharp):

1.         void OnEnable()
2.         {
3.             _commandBuffer = new CommandBuffer();
4.             _commandBuffer.name = "Test CommandBuffer";
5.             int testRT = Shader.PropertyToID("_testRT");
6.             _commandBuffer.GetTemporaryRT(testRT, 500, 500, 0, FilterMode.Point, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear, 0, false);
7.             _commandBuffer.Blit(BuiltinRenderTextureType.CameraTarget, testRT);
8.             Camera.main.AddCommandBuffer(CameraEvent.BeforeImageEffects, _commandBuffer);
9.         }

 

https://docs.unity3d.com/Packages/c...l/universalrp-builtin-feature-comparison.html:

To get it to work in URP, you'll probably need to create a subclass of ScriptableRendererFeature, which adds a ScriptableRenderPass, which creates the commandbuffer and executes it in

Code (CSharp):

1. public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)

. There are examples out there on the web that I followed to do this kind of thing, sorry I don't have the link handy.

 

Many Thanks !
In the table, I can already see they have banned so many pipeline features of URP regarding to Commndbuffer and Camera rendering callbacks.... Quite a shock to know the fact... just feel like falling into the bottom of a trough on the learning curve...

I think the link below is the way you've pointed:
https://github.com/UnityTechnologies/LWRPScriptableRenderPass_ExampleLibrary

 

No problem.
I recommend you look at this repository instead, as it is up-to-date for URP (LWRP is the old name):
https://github.com/Unity-Technologies/UniversalRenderingExamples

There is also a video tutorial that explains this repository somewhere...