Licensee reports lighting build fails for their specific levels which were created in 4.14.1 then moved to 4.15.1.
Workaround:
Setting LogLightmassSolver verbose level to Warning can show "Warning: Failed to open channel for material data" warnings. Re-saving the metarial mentioned in the warning can make lighting build work fine.
1. Open the attached project
2. Build lighting only
3. Lighting build fails with "LogStaticLightingSystem:Warning: Failed to build lighting!!! Lighting build failed. Swarm failed to kick off." message
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-44227 in the post.
| 1 |
| Component | UE - Graphics Features |
|---|---|
| Affects Versions | 4.15, 4.17, 4.20 |
| Created | Apr 21, 2017 |
|---|---|
| Resolved | Aug 18, 2021 |
| Updated | Aug 18, 2021 |