In the LOD 0, the render of lips are darker than the original’s texture but this issue only happen in LOD 0 and the others LOD are fine.
The problem appears after the Build Light, I can overide the LOD 0’s textures with the LOD 1’s but the Metahumans will be less realistic.
I think the problem will be the Lightmaps but I can’t see how to solve it or anyone with the same issues.
I have a few things you can consider trying. I am however not sure if it will resolve the issue you are experiencing.
Since this appears after you bake light, its likely due to the lightmap and it’s resolution. Increase the resolution of the lightmaps: Go to the Lightmap Resolution settings in the Project Settings or increase the resolution for the affected mesh. Also adjust the lightmap density: In the Static Mesh Editor, under the LOD settings, you can adjust the lightmap density for each LOD. Make sure the lightmap density for LOD 0 is set to a high enough value to properly illuminate the lips.
Also check the UVs of the LOD 0, ensure that the LOD 0 UVs are correctly set up and that the lips are not in a UV island which is too small, this can cause lightmap problem. If you are using a different material on LOD 0, check the material settings, particularly the emissive properties.
Once the changes have been completed make sure to use high settings and rebuild the lightmaps. In any case, you may have to experiment with different settings and combinations of the above solutions to find the best results.
