Volumetric Light Maps are not generated correctly when baked with GPU Lightmass on AMD GPUs. The issue has been reproduced on RX 9070, RX 9070 XT, and RX 7900 XT.
1. Download licensee test project (see addl info URL) and open it on a machine with an AMD GPU and a machine with a non-AMD GPU
2. Open the map "Game/TestVolumetricLightmap"
3. Build lighting with GPU Lightmass
4. Enable the Volumetric Light Map visualization mode
5. Observe the difference in the generated Volumetric Light Maps on the two machines.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-307657 in the post.
| 0 |
| Component | UE - Graphics Features |
|---|---|
| Affects Versions | 5.6 |
| Created | Jul 28, 2025 |
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| Updated | Jul 30, 2025 |