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Mirroring Normals in UDK

polycounter lvl 9
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vcortis polycounter lvl 9
Hey this has probably been answered somewhere but I couldn't find it.

I'm working in UDK more extensively and I have models that have their UV's split right down the middle.

I flip the UV's and stack them. When I import it into UDK I get a nasty seam from the normals where the two mirrored sides meet.

I heard there is a material that fixes this in UDK but I wasn't sure what it was...



  • Ben Apuna
    Make sure your seams run vertically like the pages of a book not the pages of a calendar. Any other direction will cause a visible seam. Even then it's not perfect. It also has a bit to do with how you layout your lightmap UVs.

    Read more about the issue from this thread.


    After using lightmass to bake lighting for a bit now I'd say sometimes it helps to not split mirrored lightmap UVs, but to merge them instead.
  • vcortis
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    vcortis polycounter lvl 9
    Oh wow, thank you so much Ben! That worked like a charm. At first I thought it didn't but after deleting and reimporting the object again it finaly updated and no seams! Thanks again!
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