About this time last year, Epic Games debuted a tech demo known as "Showdown" at Oculus Connect in Hollywood in an effort to showcase how developers might use Unreal Engine 4 to create virtual reality games and experiences.
Now, almost a year later, you can download the Showdown demo project and its associated assets for yourself through the 'Learn' section of Epic's launcher. Developers handy with Unreal can dig into the project to see how it works, and anyone can play the demo on an HTC Vive, the Oculus DK2 or (if you happen to have one handy) Sony's Project Morpheus headset.
For more on the demo and a link to download Epic's launcher program, check out the Unreal Engine blog.