UDK / xNomral lighintg seam normal problem

kypo

Hi, i'm having some issues with UDK i've been looking around for a solution to the mirrored lighting problems that happen in unreal but for some reason this asset is really stumping me.



for some reason even after offseting the UV's the lighting looks different on the mirrored piece and some areas have a seam.

I've uploaded the FBX's for the high and low res models
HiRes FBX
LoRes FBX

and the maya file i'm using
Maya scene

Any ideas where i'm going wrong?

Thanks.

Obscura

hi! place your mirrored uv chunk to U 1 on your uv map
like this:

kypo

Hi Obscura. the problem still happens when when the geometry is mirrored and offset. Here's the UV's for the model.



Weirdly enough the end part to the left has actually got it's own UV space where a seam is happening. Confused :S

Cheer.

JamesWild

Try this: flip the mirrored section's UVs on X, then set the texture's wrap type to mirror. (I assume you can do this in UDK, should be able to) I have no idea if this will work but might. This will flip the UVs AND the texture beyond 1, hopefully making "correct" tangents.

Obscura

Have you tried to rebake them, after you modified the uvs?

kypo

No luck unfortunatly. I'm currently using x+ Y- Z+. These are correct for UDK right?

kypo

Hmm I've just unticked import tangents and it's fixed the problem. Maybe i'm exporting the tangents from maya in a way thats causing errors?

kypo

Another quick update. Found tangents work from 2012 if you use the 2012.2 fbx exporter where are the 2013.3 one seems to cause some problems when going into unreal

cptSwing

Similar with Max with the "Qualified Normals" toggled on - no need to even "export tangents" in FBX. Seems to pass them along automatically.