Issue with texture in game

[gooddog15]

I'm having an issue with my parts texture in game. Dark lines for some reason appear on top of the part and the feed lines.

I didn't have any visual problems like this in Blender or Unity.

In VAB:

In flight:

Does anyone know whats going on here?

[Ven]

I don't believe that those lines have anything to do with the texture, but rather it may be a problem with the model's geometry.

The pipe may be suffering from something called poling, where too many edges (4+) connect in a single vertex, causing sharp specular lines to appear.

Or perhaps there's several edge loops close to each other.

Could you share a wire-frame view of the model? That'd help me (or others) determine what is happening.

[gooddog15]

ask and you shall receive:

I don't think that the pipe suffers from poling, although it may have too many faces.

[sumghai]

Yes, the mesh for the piping is a bit fine, but I doubt that is the cause of your problem.

Could you try uploading your texture? I suspect that it has a black background, and your UV islands may be too close to the edge of the colored areas and causing some of the black to bleed over.

[gooddog15]

I made sure that there wouldn't be any background bleed with the UV, and the texture has a transparent background.

I redid the UV on places of the model that were affected, but nothing changed.

with UV:

[sumghai]

In that case, the problem may be beyond your control - the only thing I can suggest is try checking KSP's graphics settings.

[Randazzo]

You don't have that effect if you use a diffuse shader, no?

Try adding a specular map (alpha channel) to your texture, if you're using a specular shader. Sometimes making those faces into islands in Blender helps too (select faces, press Y). Other times it's just jacked up .

Edit: You can also try setting the object scale (make sure it's the size you want it to be first, or an easily scaled size like 1m), select the object and press ctrl+a then click on scale. It will reset the default scale to 1 with the current dimensions. Having an oddly scaled object sometimes leads to weird artifacts. It could also be the projection used to UV map it. I've found the least artifacty way to unwrap is just the basic unwrap and then manually aligning the axes. There's bound to be a better, faster way but I haven't figured it. You'll need to mark the seams first if you do that.

Edited September 27, 2015 by Randazzo

[InsaneDruid]

Could you export the model in a blender readable format and upload it, along with the texture?

EDIT: I suspect texture stretching and want to investigate further.

[NecroBones]

with UV:

http://i.imgur.com/se2nowA.png

That looks like not nearly enough bleed. For a 1024x1024 texture, you probably want 8+ pixels of bleed around the outside of every polygon/island in the UV map. Anywhere that the polygons have colors in common, they don't need be pushed further apart, but rather the outside of a color region where it meets the white/transparent background is probably where you're running into some trouble.

Edited September 28, 2015 by NecroBones