3D artist Alden Filion, who has worked in some triple-A games like Battlefield 4, Crackdown 3 and Lost Planet 3, has released a new Unreal Engine 4 ray tracing tech demo. This tech demo was created for the Nvidia DXR Spotlight contest. UE4 Diode is basically a short third-person action/melee game that takes advantage of real-time ray tracing. Players can explore a castle, solve a simple puzzle and fight some enemies.