Description

Encountered an issue where local lights appear to be broken when baking lighting with GPU Lightmass. See screenshots attached.

Tested regression in //UE5/Release-5.5 @ CL40574608 and the issue does occur. This is not a regression.

Steps to Reproduce
  1. Open QAGame
  2. Enable the following in Project Settings:
    • Support Hardware Ray Tracing
    • Support Compute Skin cache (will be auto enabled with ray tracing)
    • Support Virtual texture
    • Support Virtual texture lightmaps
  3. Enable the GPU Lightmass plugin
  4. Restart Editor
    • If working in source, you will have to build the plugin
  5. Open TM-GPULM_SpotLights level
  6. Build lighting using GPULM

Results: Some Spot Lights do not generate any light
Expected: All lights in the scene should generate correct lighting

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-294277 in the post.

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Unresolved
ComponentUE - Graphics Features
Affects Versions5.55.65.7
Target Fix5.7
CreatedJun 2, 2025
UpdatedJun 3, 2025
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