ComputeBuffer readback fails when Render Graph is enabled

6.4.X

As Designed

Graphics.SetRandomWriteTarget() is not supported with URP Render Graph. This lack of support is by design, because on some graphics API these buffers share the same binding slot-space with other type of buffers. So setting them globally can generate rendering issues in SRP. It is recommended to implement a URP Scriptable Renderer Feature (custom pass) with an async GPU readback instead. You can implement it within the render function of your Render Graph pass: using (var builder = renderGraph.AddUnsafePass<ReadbackPassData>("ReadbackPass", out var passData)) { builder.AllowPassCulling(false); // Which buffer to read from passData.bufferHandle = m_OutputBuffer; builder.UseBuffer(passData.bufferHandle, AccessFlags.Read); builder.SetRenderFunc(static (ReadbackPassData data, UnsafeGraphContext ctx) => { ctx.cmd.RequestAsyncReadback(data.bufferHandle, (AsyncGPUReadbackRequest request) => { var result = request.GetData<int>(); Debug.Log(string.Join(",", result)); }); }); Check URP Render Graph documentation and URP Render Graph samples for more information. We are planning to include an async readback sample in the coming month.