How to resolve problem with back-face culling and export it to a game engine? I would like to know how to fix the problem with "back-face culling", check this photo.



In my 3D viewport you can see the right window in Unity has a problem, you can as spectator see the inside of the pipe, however in front view (left window in the picture) the interior faces are ok .

So my first steps in Blender were


Check the display to "GLSL" (Blender Internal)
Go into Edit Mode and flip the normals of all the mesh (press W > Flip Normals on all mesh objects).
Once I've flipped all the normals I activate the option Back-face Culling in the N panel
Apply the transformation .
Unwrap the model (check marked seams if possible and space for
texture bleeding)
Export in FBX/OBJ files to the game engine.


I would like to know how to fix back-face culling for cylinders objects.
Blender's show back faces option is just for viewport purposes and doesn't effect export. The easiest solution is to duplicate the faces of your pipe, flip the normals on the copy, and keep both overlaid. Alternatively you can find or make a Unity shader that shows back faces.