Alter stereo projection matrices in URP 12.1

I am having great difficulty determining what is the correct way to jitter the stereo projection matrices in URP 12.1. Historically and without stereo it looks like you could add a RenderPass to do this BeforeRenderingOpaques:

Code (CSharp):

1.         public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
2.         {
3.             CommandBuffer cmd = CommandBufferPool.Get(m_ProfilerTag);
4.             using (new ProfilingScope(cmd, m_ProfilingSampler))
5.             {
6.                 CameraData cameraData = renderingData.cameraData;
7.                 cmd.SetViewProjectionMatrices(cameraData.camera.worldToCameraMatrix, m_TaaData.IProjOverride);
8.  
9.                 context.ExecuteCommandBuffer(cmd);
10.                 cmd.Clear();
11.             }
12.             context.ExecuteCommandBuffer(cmd);
13.             CommandBufferPool.Release(cmd);
14.         }
15.  

I've also seen strategies around:

Code (CSharp):

1. RenderPipelineManager.beginFrameRendering += RenderPipelineManager_beginFrameRendering;

But nothing seems to work. Could anyone point me in the right direction on this? Thanks!

 

Bump. Found this in ScriptableRenderer.cs. The code and comments seem to contradict each other.



Do I need to make a modified copy of URP just to be able to jitter the camera matrix in the SRP? Are there any alternatives?