Best materials and appearances for Unreal Engine projects?
Epic Games has an enormous amount of FREE material libraries that rival in aesthetics the industries best rendering software including what you've seen in KeyShot, V-Ray, Arnold, Octane, and Redshift.
A large majority of Unreal Engine materials are based on PBR (physically based rendering) techniques that recreate the material properties to be as close to the true-to-life material appearance.
This is your Go-To free material collection:
Here's a McLaren 570S demo using the free automotive material collection
Here's a Porche 911 demo using the free automotive material collection
Among many other FREE plugins for materials, here's another great addition for your Unreal Engine projects
All and every material used in the Unreal Engine can be completely overhauled, edited, and made dynamic to suit any project. You just can't go wrong!