Comment by wlesieutre

> If you want to achieve dirt accumulation, there have always been many tools that were able to generate "dirt" textures by analyzing geometry

Substance Designer being the big one today:

http://i.imgur.com/jjfjyj7.png

Basically you generate a curvature map where convex corners are light and concave corners are dark, then use that to mask texture effects for edge wear, dirt, etc.

https://support.allegorithmic.com/documentation/download/thu...