Question URP 13.1.8 is adding Clear() after my custom RenderPass if start BeforeRenderingOpaque?

Hi, I updated my project from URP 12 to URP 13, and since then my render pass is followed automagically by a "Clear" color, which is the opposite of what I want.
If I'm writing inside the RenderTarget in the BeforeRenderingOpaques this for a good reason why this "Clear" appear from nowhere?



Also, if I call the BlitToStack pass on the AfterRenderingOpaques, no clear appear automagically between my pass and the next pass. Where this clear come from? And why urp assume we need a clear here? It was working perfectly on URP 12 without this clear.

Code (CSharp):

1. private RTHandle _target;
2.         private RTHandle _rtd;
3.        
4.         void Dispose()
5.         {
6.             _rtd?.Release();
7.         }
8.        
9.         public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData)
10.         {
11.             _target = renderingData.cameraData.renderer.cameraColorTargetHandle;
12.             var desc = renderingData.cameraData.cameraTargetDescriptor;
13.             desc.depthBufferBits = 0; // Color and depth cannot be combined in RTHandles
14.             RenderingUtils.ReAllocateIfNeeded(ref _rtd, desc, FilterMode.Point, TextureWrapMode.Clamp, name: "_MergeBufferHandle");
15.         }
16.  
17.         public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
18.         {
19.             var cb = CommandBufferPool.Get("BlitToStack");
20.             CreateCommandBuffer(cb);
21.             context.ExecuteCommandBuffer(cb);
22.             CommandBufferPool.Release(cb);
23.         }
24.  
25.         private void CreateCommandBuffer(CommandBuffer cb)
26.         {
27.             if (StackTexture.Count > 1)
28.             {
29.                 for (var i = 0; i < StackTexture.Count; i++)
30.                 {
31.                     cb.SetGlobalTexture("_MainTex", StackTexture[i]);
32.                     cb.Blit(StackTexture[i], _rtd, Mat, 0);//, new Vector2(1f, -1f), new Vector2(0, 1f));
33.                 }
34.                 cb.Blit(_rtd, _target);
35.             }
36.             else
37.             {
38.                 cb.Blit(StackTexture[0], _target);
39.             }
40.         }

 

Did you ever figure this out? I am running into the same issue.

 

@kankane I've not encountered the issue before, but in OnCameraSetup() have you tried calling ConfigureClear(ClearTarget.none, Color.clear) by any chance?

 

Hey @AurochChris, thanks for the idea. I just tried that but no change unfortunately.

 

Actually, I spoke too soon. It does seem to work on the mobile device but not in the editor. I can work with that for now. Thanks!