3d coat to 3ds max texture

iRoller

I modeled a very simple arched plank in 3ds max, uv'd it and put it into 3d coat. I painted the top of the mesh and everything looks fine, but when I export it and import it back in 3ds max and apply the material there is a weird issue with a grey line showing up in the center of the mesh. The UV's themselves are shared, as in both sides of the mesh share the same uvs but it is just mirrored. I tried looking at the model in UE4 and I get the same weird issue. In 3d coat however, the problem is not visible. If I throw any other texture on the mesh it seems to be fine, however with the texture i made for the mesh i get the odd grey line. heres some screenshots:
this issue is visible on all sides. any help would be greatly appreciated. thanks

lorenzo_di_pietro

Maybe it's unrelated, but I see that your UVs are too close to the border of the UV space: scale them down a little, and then export the diffuse map again from 3D-Coat.

Eric Chadwick

Show the texture flat with the UVs overlaid. I bet you don't have edge padding.

AHME8

yes man show us your maps . in good res , edge padding ignoring makes those kind of artifacts , as Eric says

iRoller

only top texture is finished but happens on all sides

Eric Chadwick

Replace all the gray with the same brown as the wood. http://wiki.polycount.com/wiki/Edge_padding

iRoller

Turns out 3DCoat has a wonderful feature for this on export that does it for you. I do have another question about a 'seam' that shows up in the middle of the model where it is mirrored. It is probably difficult to see in the image, but the two sides are slightly different colors and the central edge becomes very visible in the engine. Was wondering if there is any ways to avoid this. Thanks for all the help.

AtticusMars

Can't see shit in that screenshot but based on your description I'm willing to bet you have a smoothing group split in the center or duplicate/unwelded vertices.

iRoller

I fixed the smoothing groups and welded the vertices but the same shading problem persists. Is there anything else that can cause this?

iRoller

bump

iRoller

still haven't figured it out and i can't find anything on this either...

*EDIT exporting as obj completely fixes the problem, seems fbx caused the issues. thanks for all the help guys, thread closed

Eric Chadwick

Did you do the edge padding? 

iRoller

Yes, that fixed the gray artifacts formed around seams, using obj fixed the shading issue.