Question Topographic Scanner Effect In URP

I have seen a really cool effect in youtube, the Link is here:https://www.youtube.com/results?search_query=urp+Topographic+Scanner

But it is under build-in pipeline. So I try to transform this code into URP project , and I meet some tricklish questions. In this tutorial, he use GL to draw a QUADs to record relative location between camera position and screen position like this:

And I use this in scriptablepass. In framedebugger it shows <unknown scope>:

it is a wrong render order, I really have no idea how to solve this. thanks everyone for help.

Code (CSharp):

1. private void RaycastCornerBlit(CommandBuffer commandBuffer)
2.         {
3.             // Compute Frustum Corners
4.             float camFar = m_Camera.farClipPlane;
5.             float camFov = m_Camera.fieldOfView;
6.             float camAspect = m_Camera.aspect;
7.  
8.             float fovWHalf = camFov * 0.5f;
9.  
10.             Vector3 toRight = m_Camera.transform.right * Mathf.Tan(fovWHalf * Mathf.Deg2Rad) *
11.                               camAspect;
12.             Vector3 toTop = m_Camera.transform.up * Mathf.Tan(fovWHalf * Mathf.Deg2Rad);
13.  
14.             Vector3 topLeft = (m_Camera.transform.forward - toRight + toTop);
15.             float camScale = topLeft.magnitude * camFar;
16.  
17.             topLeft.Normalize();
18.             topLeft *= camScale;
19.  
20.             Vector3 topRight = (m_Camera.transform.forward + toRight + toTop);
21.             topRight.Normalize();
22.             topRight *= camScale;
23.  
24.             Vector3 bottomRight = (m_Camera.transform.forward + toRight - toTop);
25.             bottomRight.Normalize();
26.             bottomRight *= camScale;
27.  
28.             Vector3 bottomLeft = (m_Camera.transform.forward - toRight - toTop);
29.             bottomLeft.Normalize();
30.             bottomLeft *= camScale;
31.  
32.             // ----------------------------------------
33.             GL.PushMatrix();
34.             GL.LoadOrtho();
35.  
36.             m_Material.SetPass(0);
37.  
38.             GL.Begin(GL.QUADS);
39.  
40.             GL.MultiTexCoord2(0, 0.0f, 0.0f);
41.             GL.MultiTexCoord(1, bottomLeft);
42.             GL.Vertex3(0.0f, 0.0f, 0.0f);
43.  
44.             GL.MultiTexCoord2(0, 1.0f, 0.0f);
45.             GL.MultiTexCoord(1, bottomRight);
46.             GL.Vertex3(1.0f, 0.0f, 0.0f);
47.  
48.             GL.MultiTexCoord2(0, 1.0f, 1.0f);
49.             GL.MultiTexCoord(1, topRight);
50.             GL.Vertex3(1.0f, 1.0f, 0.0f);
51.  
52.             GL.MultiTexCoord2(0, 0.0f, 1.0f);
53.             GL.MultiTexCoord(1, topLeft);
54.             GL.Vertex3(0.0f, 1.0f, 0.0f);
55.  
56.             GL.End();
57.             GL.PopMatrix();
58.             // ----------------------------------------
59.            
60.             Blit(commandBuffer, source, m_TempRenderTargetHandler.Identifier(), m_Material);
61.             Blit(commandBuffer, m_TempRenderTargetHandler.Identifier(), source, m_Material);
62.         }