That is really a great thing for us all. http://fewhacks.com/
I just based my landscape material on this. I just wish I could exactly figure out what is going on with normals, ao and displacement here.
That was extremely helpful! Thank you!
Check out this breakdown of the PBR texturing of an old damaged door for an abandoned building in Substance Painter 2 by Vitaly Okulov. You can get similar textures here.
Vitaly is a 3d artist with over 9 years of experience. He is a master of both low and high poly modeling, texturing, 3D scanning and rendering for modern game engines such as Unity 5 and Unreal Engine 4. He also creates 3D assets for the Unity Asset Store and UE4 Marketplace. You can find more of his projects here.