[SOLVED] Help - Ugly lines on the mesh

Can you share the .package for someone to take a look? It looks like reflections from the image you shared. You could try making the specular blank if you haven't already done so.

It's definitely the specular because the lines didn't appear when I used a blank specular. I played around with creating a proper specular and got the lines to smooth out somewhat. I think part of it is just the way the game renders shiny textures which is why people often just go with a blank specular. But, as you said, that doesn't work if you want shine on your object.

I don't know how to create a specular in Blender. I always adjust the channels manually in Photoshop. For the effect I got below, I lightened the red channel, darkened the green channel a medium amount and darkened the blue channel a small amount. For the alpha, I went with hex code #3b3b3b. You can read my specular tutorial for more information how the specular texture works. Make sure you save as a DXT5 .dds with alpha channel enabled.

To get a nice, smooth bake to use for the specular, I added two subdivision surface modifiers to the mesh. That increases the poly considerably which helps you get a good bake. Then, save the high quality bake, but undo the modifiers/don't save your mesh changes and still use the lower poly mesh to create your LODs.