UE4 Infiltrator demo is free for download

Epic Games and Unreal Engine 4 made the entire Infiltrator project available for free to download. You can use it it any of your UE4-based projects.

Infiltrator is a high-end demonstration of Unreal Engine 4’s rendering and cinematic capabilities. Originally shown at GDC 2013, it’s still highly representative of the capabilities of high-end PC GPUs. It’s an incredible demonstration of the UE4 capabilities and physically-based rendering! The engine has evolved significantly since the demo’s original release, so you migh have to make some tweaking and adjustments. To download the project go to Epic Games launcher and open the Learn tab. Good luck!

Physically-based materials documentation.

Source: unrealengine.com