I'm trying to model a sort of bottle that in Blender:
Like you see the base of the bottle has a different material and there's a face on the top of it. But when I export the model in Unity 3D, the object appears as if the face doesn't exist, and the object has a "hole":
What am I doing of wrong? how should I properly set the faces in a way that the bottle doesn't appear to have a "hole" in the bottom?