Epic Games has released a new way for you to render your characters comparable to those found in Epic's MOBA, Paragon. Pushing the rendering features of Unreal Engine 4, Epic made improvements in shading skin, eyes, and hair along with many other character attributes.
To get the community started in utilizing this new feature, documentation has been released to help you jump right into it!
If you're eager to check this out on your own, you can download Unreal Engine 4 for free and get started here.
Source: Unreal Engine