I have a quick question. When I import models into Unity from various 3D modeling programs, the models end up with missing faces. I’ve tried flipping normals, making meshes two-sided, exporting as different files etc and the problem still persists. I was wondering if there is a way to fix this issue without having to do a million things to get the object imported correctly?
Thank you very much for any suggestions. 
Hey Joel,
This is usually a normals issue, and flipping the normals on the missing face should solve it; there’s no need to make it two-sided, nor would you want to in most cases since that would affect performance. When you load the model into unity, try looking at the missing face from behind by rotating the model in the editor view. If it suddenly appears, then it’s definitely a normals issue.
Hope that helps!
El Diablo