Bug Shadow Issues with custom Camera Matrix (CASE IN-9123)

(CASE IN-9123) (Using URP 12)

I'm having issues with realtime shadows when using my custom camera worldToCameraMatrix.

My goal is to have a camera projection that will make the game look top down 2D but allow for shadows, depth etc. - by using planes standing straight up but rendering facing camera. I got this from this article: https://www.gamedeveloper.com/programming/adding-some-perspective-to-your-unity-2d-game-

I have the camera projection setup as I want it, but there is a problem with shadows not rendering at all when camera goes past a certain distance from the world center. In certain spots one can clearly see the shadow sphere as well.

This is how I change camera projection:

Code (CSharp):

1.   public class CustomProjection : MonoBehaviour
2.     {
3.         [SerializeField] private bool _resetCameraMatrixOnEnd;
4.         [SerializeField] private Camera _camera;
5.         [SerializeField] private Vector4 _matrixYOffset = new Vector4(0, -1, 1, -0.1f);
6.         [SerializeField] private Vector4 _matrixZOffset = new Vector4(0, 0, 0, 0);
7.  
8.         private void Start()
9.         {
10.             _camera = GetComponent<Camera>();
11.         }
12.  
13.         private void OnEnable()
14.         {
15.             RenderPipelineManager.beginCameraRendering += OnBeginCameraRendering;
16.             RenderPipelineManager.endCameraRendering += OnEndCameraRendering;
17.         }
18.  
19.         private void OnDisable()
20.         {
21.             RenderPipelineManager.beginCameraRendering -= OnBeginCameraRendering;
22.             RenderPipelineManager.endCameraRendering -= OnEndCameraRendering;
23.             _camera.ResetWorldToCameraMatrix();
24.         }
25.  
26.         private void OnBeginCameraRendering(ScriptableRenderContext scriptableRenderContext, Camera camera)
27.         {
28.             SetMatrix(camera);
29.         }
30.  
31.         private void OnEndCameraRendering(ScriptableRenderContext scriptableRenderContext, Camera camera)
32.         {
33.             ResetMatrix(camera);
34.         }
35.  
36.         private void SetMatrix(Camera camera)
37.         {
38.             if (camera != _camera && camera.cameraType != CameraType.Game)
39.                 return;
40.      
41.             var matrix = camera.transform.worldToLocalMatrix;
42.             matrix.SetRow(2, -matrix.GetRow(2));
43.             matrix.SetColumn(1, 1e-3f * matrix.GetColumn(1) - _matrixYOffset);
44.             matrix.SetColumn(2, matrix.GetColumn(2) - _matrixZOffset);
45.             camera.worldToCameraMatrix = matrix;
46.         }
47.  
48.         private void ResetMatrix(Camera camera)
49.         {
50.             if (camera != _camera && camera.cameraType != CameraType.Game && _resetCameraMatrixOnEnd)
51.                 camera.ResetWorldToCameraMatrix();
52.         }
53.     }

Camera settings:


I've also attached the small test project and moving the camera around should show the shadows popping in and out clearly.

Not sure if this is a bug or if I'm misunderstanding camera projection and it should be done in another way.
Any help would be appreciated, thanks!

 

There has been no progress on the bug report, so I guess as a desperate attempt to get some attention I'll post this gif showing the render debugger and the main shadow. You can see clearly it's bugging out at certain positions and I can't make any sense why it would. Sometimes the texture is fully gray and sometimes it's just showing a small part of the whole shadow texture. Toggling the custom camera matrix off and it works correctly again.

Here is the issue on the tracker:
https://issuetracker.unity3d.com/issues/not-all-shaders-get-rendered-when-using-custom-camera-matrix