Description
Version to Version Results
New 5.0.3 project to 5.1.1 Works as Expected
New 5.1.1 project to 5.2 Works as Expected
New 5.0.3 project to 5.1.1 to 5.2 Bug Occurs
New 5.0.3 project to 5.2 Bug Occurs

The scene looks correct at Runtime.
Disabling Ray Traced Shadows on the Directional Light causes the scene to render correctly.

Steps to Reproduce

These are very specific steps to repro the issue 100% of the time. There are alternative steps, but they don't always trigger the issue.

  1. Create a new Blank project in Unreal Engine 5.0.3 with Ray Tracing enabled
  2. Create a new Basic Level
  3. Delete everything, but the Floor and Directional Light
  4. Place 250 or more Cubes
  5. Adjust the Directional Light so that the Cubes' shadows are obvious
  6. Save the level as "Test"
  7. In Project Settings > Maps and Modes set Editor Startup Map to the "Test"
  8. In Project Settings > Engine > Rendering:
    • Set Shadow Map Method to Shadow Maps
    • Enable Ray Traced Shadows
  9. Close the editor
  10. Either change the .uproject Unreal Engine Version to 5.2 then open it or Launch 5.2 then open the project as a Copy
  11. Observe the Scene

Expected Results:
Ray Traced Shadows from the Directional Light are correct.

Actual Results:
The Scene is black save for blown out lighting on the cubes.

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-186029 in the post.

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Fixed
ComponentUE - Graphics Features - Ray Tracing
Affects Versions5.2
Target Fix5.3
Fix Commit26096833
Main Commit26096462
CreatedMay 16, 2023
ResolvedJun 19, 2023
UpdatedAug 17, 2023