[Repost] Viscorbel Creating Old'N'Dirty V-Ray Materials

This is my most advanced VRay material tutorial yet. Instead of focusing on many simple, but specific materials, I’m going to show you techniques you can use and combine to create infinite variations of old, aged, vintage, dirty, antique, industrial, etc materials.
I’ll show you specific techniques to quickly create:
Scratched edges
Chipped edges
Patina
Polished convex areas
Leaks
Splashes
Dirt
Dust
Moss
Fading colors
…etc
None of these rely on painting custom maps on top of the UVs – everything is done with some clever use of tileable textures, procedural maps and geometry specific masks generated right in 3Ds max. And the best thing is – the materials are easily reusable for any other 3d object! (No need to make the new maps from scratch)