https://wccftech.com/the-witcher-3-mods-ambient-occlusion-anti-aliasing/

A couple of new The Witcher 3 mods have been released online recently, introducing some visuals improvements to the game and changing some of the soundtrack.

The first new mod is actually a Reshade preset which aims to improve ambient occlusion, introduce SMAA for improved anti-aliasing and more. You can download the preset by going here.