I have a strange problem. I modeled and textured some plane using UV mapping which I modified and extruded a lot. Now when I render it from different angles, I have transparent meshes in different sides of the model.
When I do Mesh > Flip Normals, it flipped all the faces which previous looking transparent and now they look textured.
So how I make my mesh consistent and without transparent faces?
Here is the images after flipping normals: