They use face weighted vertex normals. Ther's a thread floating around about custom vertex normals on the first or second page. Should have some useful scripts for you. edit: http://polycount.com/discussion/154664/a-short-explanation-about-custom-vertex-normals-tutorial/p1
And, i am here again :) Carefull - long post here. Did a lot of research. Searched all possible options via google - seems like no one models mid-poly cars these days :D What i am trying to achieve: nice smoothed mid poly car model with proper reflectons and without normal map on its body. Stuff that we can see in every…