I'm working on a small project with 12 houses.
I made all houses as an individual group and assigned materials to the surface and it rended nicely.
I then exploded one of the groups, and now when i render the house it render the revers face.
i don't know how to fix this problem and it quite a big task to change and remap the all metatarsals
another thing i don't know why when i create a face it it doesn't assign the materials to both face some times it dose and some times it doesn't