Normal Map issues in UDK

CJE

Hey guys,

Trying to import a simple mesh into UDK and setup some materials on it, but I'm having an issue with my Normal Map giving me hideous lighting seams at certain angles where the geo is mirrored.

As far as I can tell the bakes are fine, and the lightmap unwrap is fine (if that even matters for the mesh preview window).

I don't see these in Max with the standard shader or the 3point shader w/ Quality Normals.

When lit head on, I see no issue, but if you light the faces at an angle you can see the seam.

ibarter

Maybe this will help:
http://wiki.polycount.com/NormalMap?highlight=%28\bCategoryTexturing\b%29#Mirroring

CJE

Hmm, that link is just general information on how to/what is mirroring, doesn't really help. Is there a specific shader node that needs to be added in materials in UDK perhaps to support mirrored UV??

CJE

Hmm, seem to have it fixed by reimporting the model for a 3rd time. I guess something messed up during the import process in UDK.

Gilgamesh

Looks because of no lightmap it's being vertex lit probably. I know you said you had a lightmap uv for it but if it's not selected correctly inside UDK it will automatically go back to vertex lighting so when you re-imported it last it could have found the lightmap UV set properly.

haiddasalami

Are your UV seams mirrored horizontally or vertically?