Normal Artifacts in UE5

Sani

HI, i'm a 3D artist starting to learn UE. I imported my low-poly mesh into unreal and also imported baked normal map for it (directx format). With normal map applied to the model on some details there is a shift in place of UV seams, other details have obvious distortions, and these artifacts appear only in UE, in other software like Blender/Substance Painter there is no artifacts. I would be very grateful if someone could tell me how to solve this problem and even more grateful if someone could explain what causes it.

Fabi_G

Hi! Did you triangulate the model before baking, to ensure the topology is consistent across applications?

It would be good to have more info (lowpoly shading, UVs, wireframe). Ideally, share files.

Sani

https://drive.google.com/drive/folders/12cAt6roOJlgv0FpqPGMszq8MOXZ6fTS9?usp=drive_link

Sani

Yea, I triangulated my mesh before export

Fabi_G

Hi! I would try turning on "Use Full Precision UVs" for the mesh in the static mesh editor in Unreal. By default static meshes use half precision UVs to save memory.

Edit: Unrelated, if you re-use UV space for mirrored/repeating elements you can increase texel density, meaning less jagged edges. Could use a second UV channel with unique UVs to add variation. Creating details as mesh decal layer would be another option.

Sani

That fixed all the problems, thank you very much!