[Solved] Having some shading artifacts on model dump, edit, then import

[Manuel-ito 322]

So, I have a small problem:

I'm getting started in asset making and, as a start, decided to dump then edit the vanilla metro station model so that it occupies a 1x1 space instead of a 2x2. Here's the model in Blender, viewed from above and from underneath:

When I import it as .obj into the game, I notice these lightning artifacts on the stairs and floorplate:

How can I fix this? I tried remaking the affected triangles and remapping them, but that didn't work.

Also, I noticed a similar problem in the raw dump made with modtools:

I tried searching for this problem on the web, but didn't find any exact results. Maybe I'm being a dunce and missing something obvious

[Miccrosshill 367]

The second picture with the glow looks like a wrong specular map .. all shiny comes from white spec

[Avanya 2,605]

Dumped models are mirrored when you pull them into Blender. That's easy to fix. In Edit mode select everything (hotkey A), hit ctrl + M and then X (I think that's the right axis anyways). Then hit W and select Flip Normals to get all the faces the right way again.

Your other problem is because the whole model is set to smooth shading. In edit mode you can change the shading of different areas of the model. There's a toolbar on the left (3rd tab). Everything but the railing and the sign's post should prob be shaded flat.

[Manuel-ito 322]

I tried changing the specular map and the flat shading as suggested. Unfortunately, neither solved the problem. I also tried exporting it as .fbx instead of .obj, thinking that it may not like the .obj format, but that didn't solve it either.

Here's what it looks like in the asset editor preview window, with the flat shading:

At least the floor looks less shiny. And the model is no longer mirrored

I'll add that I used modtools' asset export feature before on workshop assets for personal use, and those didn't have these lightning issues. Maybe it's an issue on re-importing CO assets?

[boformer 3,169]

Probably a normal map issue. What happens when you supply a blank normal map?

[Manuel-ito 322]

That actually solved it! Thank you

I first tried without a normal map and the problem was gone. In between reading an older thread about a similar problem and checking the mapping again I found out that, for some reason, the normal map got exported at a higher gamma than usual (the lod's exported fine) One gamma correction later, and that got the normal map back to work like shown above.

Once again, thanks everyone for the help

  Edited July 28, 2017 by Manuel-ito  
I was so happy that I repeated the word 'normal' thrice. Removed one and used a synonym