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In the user's debug scene, the wall is already 50 cm thick. The artifacts disappear around 100cm.
Thickness X scale 0.5:
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Thickness X scale 1:
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-187433 in the post.
| 0 | 
| Component | UE - Graphics Features | 
|---|---|
| Affects Versions | 5.2 | 
| Target Fix | 5.6 | 
| Created | May 31, 2023 | 
|---|---|
| Resolved | Feb 13, 2025 | 
| Updated | Mar 24, 2025 |