Strange shine down middle of mesh

[GreatKazooMan]

I suspect this is something either to do with the surface of the mesh or a UV problem or a normal map problem, but I have no idea which it is.

 

When I make a new item in Blender and then create a nif with it, I sometimes get this zigzag line down the middle or on the sides of the object

in question, though I have no idea what is actually causing it. I set tangents in Nifskope before trying them out in the NV, but that line shows up

on some surfaces. Not everything, but a lot of them. The tangent thing sometimes works, but this can sometimes rear it's ugly head at the worst

possible times.

 

I can put up a pic if anyone doesn't know what I am talking about, but if you do, then please help. Hopefully it can be remedied...

[Guest]

A pic would help, yes.

 

The only zigzag line issue I know is the one when exporting a body mesh, that line on a side of the body, which runs along the torso, in vertical, which is usually solved with the option Update Tangents and then save, in nifskope (and I think it's what you've already done). What kind of downsides causes you?

[GreatKazooMan]

Here is the picture attached. What you see there is after updating the tangents, with a normal map that is set to glossy. Thing is, another body part I took the normal map away from still has that line going down the middle. Technically it seems like the tangents or the uv map is an issue, but it's a clean mesh.

 

Maybe it's a settings issue when in Blender?

[Guest]

And this remains even if you open on nifskope and do the Update Tangent option?

 

(ps that mesh is very nice, congratz!)

[Halstrom]

I got a few lines like that in places where I screwed up the edges of textures overlapping or something

[GreatKazooMan]

Yeah, the line shows up even if I take the Tangents or remove the normal map. Looking at the UV inside the mesh shows it to be very smooth and normal like any other well-made object, but this (and others I have encountered before) give this annoying shine.

 

This is not a mesh I made, but was a female FNAF Bonnie from a DeviantART artist. But this issue happens on MMD Miku models I tried before also...

[GreatKazooMan]

I fixed it!!

 

Okay, so here was where the issue lay - the UV map had the sides of the head overlapping in a tight bunch where this line occurred, so I selected all

the vertices that represented the blue part of the head and then I re-did the UV map for that part only, and fixed! What it was basically doing was making

all the faces along that bunched up area reflect the light in a tight mess. Re-doing the UV map flattened the surface faces so they had an equal share

in reflecting the light sources. Sorry if this sounds technical, as this is what was wrong with the original UV map, and what it was doing.

 

Hopefully other meshes can be solved with this. The only ones I'd have an issue with are face textures with specific maps that work the way they were

intended, where re-doing the map will break the position and overall look of the mesh. But I'll just have to look around at all options in that case.

 

For now, this issue is resolved!

 

 

Special thanks to A.J. for taking a look and pointing me in the right direction - your involvement helped me figure the problem out! **hugs** =D