[SOLVED] Lines of two sided mesh.

See dem lines?
Take a closer look:

The mesh is a helmet. I am not using a two sided shader. The mesh has both sides modeled. I have tried making it thicker to the point beyond which it would look incredibly silly, and the lines are still there.

How do I get rid of them?

Thanks

I suppose it could be unrelated to having a two sided mesh, but I haven’ had this with any other mesh.

No. Ermm maybe -
Are you talking about the green plane wireframe lines showing through the helmet? They are not visible in your game view are they?
This might be related to your graphic card.

Zoom in on the left side of the helmet. There’s jagged lines. They do appear when the game is playing.

Hmm. Maybe you have double / very close vertices there?

The closest vertices are about 0.02 units apart.

EDIT: I seem to have solved the problem while working on something unrelated. In Blender I enabled Auto Smooth on the mesh. Weird that it fixed my problem.