Everytime I tried fix the face on the brick model. When I using sketchup 2014 model, I export to obj file then I drag it to blb Converter then use editor blb allow me view the brick show me a few missing the face on brick. not matter how many time I had to fix the face, they are real pain ass! I not want add more cover face will make in game laggy, I had test it before. I want less face make smooth. aslo I did reverse face too!