A noob need help... "flip normals" didn't work

Hey guys,
I am programming a litte game for a school projekt.
And I've got a few problems, one of them is that i can see threw my weapon.
I've attached a image. i made the mesh in BLENDER and i've got this problem already twice but "flip normals" didn't work i can't flip out the right side. I think the problem is easy, but i only don't know the solucion.

Thanks for your support.

PS: sorry for my englisch i am german.

 

I've had a similar problem with 3DS Max, which was caused by using a "Mirror" operation on the object. I don't know how that works in Blender, but in 3DS a Mirror basically scales the object around it's axis by -100%. Due to Unity using a different coordinate system, this then throws it out.

So, the solution is probably one of two things: either make sure there is nothing scaled in a negative direction in Blender, or when importing the model select "Calculate Normals" as opposed to "Import".

And by the way, the Design section isn't really for questions like this. It should (probably) have gone under External Tools.

 

I went through something almost as strange as this a few times, when making a models in Blender.
Normally I would cut off and destroy/delete, the "affected part of the mesh" and remodel that part over.
Like a 3D modeller surgeon.
That normally helps solve the problem in my case.

But Philips suggestion could be right for this case too.

 

You can send to me as a .obj and I can try to fix it as a last resort if you're unable to.

 

Rather than Flip Normals you can also use the Recalculate Normals button in Blender. It generally does a very good job of fixing inverted normal.

 

Hi
Recaluate the normals with Strg+N. Must works.

 

I allready did it! If somebody else has this problem try the button under "flip normals"