.obj exportation is not working properly So i this problem with the exportation, the obj file looks fine in the 3d viewer but when I import it in unity it's all wrong, I applied all the modifiers but with no results.I tried to export it as fbx but it's the same.

This is how it should look, I don't know if there is some problem with the mesh but I don't know how to check that.
Nvm I found the answer, it is pretty easy actually. You need to go to the &quot;show overlays&quot; tab (the 3'rd one)

Then press the drop-down and enable &quot;Face Orientation&quot;

After that, all of the faces should blue on the outside and red on the inside.
To inverse them u need to select the wrong ones and go to &quot;Mesh&quot; then &quot;Normals&quot; and &quot;Flip&quot;.
(Or Alt+N and Flip)

Also, u can apply a solidify modifier so that u completely hide the red part.
Easy