Mesh Painting Texture Paint tool can miss some pixels along UV seams, even with "Enable Seam Painting" set to True.
This appears to be because of the difference between rasterization and sampling. With rasterization, a pixel is only rendered to if its center is within a rasterized triangle. When sampling, a pixel will be sampled if any part of it is within the triangle.
This leads to fine edges where some pixels are not written to during Mesh Paint, but are sampled in the material.
Also tested on //UE5//Release-5.5, CL: 36860055
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-226930 in the post.
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Component | UE - Rendering Architecture |
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Affects Versions | 5.5, 5.4.4 |
Target Fix | 5.6 |
Fix Commit | 39479541 |
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Created | Oct 8, 2024 |
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Resolved | Jan 27, 2025 |
Updated | Feb 10, 2025 |