Meshes imported are missing pieces

Every time I import a mesh from Blender it shows up in Unity with missing pieces. This only seems to happen when I make it myself, because a person generated by MakeHuman shows up just fine.

For example, this door was made in Blender.


And here's what it looks like in Unity.


Since it doesn't happen with the generated mesh I'm thinking maybe I'm doing something wrong in Blender. I've only been using it for a week.

What am I doing wrong?

 

Your normals are backwards on some portions. Blender by default will show backfaces, Unity by default will do backface culling and not display the backfaces. In blender, try selecting all faces then choosing recalculate normals and see if it helps.

 

Thank you. Now it looks right.

 

Hi!

Can I do it so simple in maya?