Epic Games wants a slice of next-generation NVIDIA GameWorks titles that are bound to leverage the RTX feature-set of its hardware. The latest version of Unreal Engine 4, released as a preview-build, comes with a host of real-time ray-tracing features. In its change-log for Unreal Engine 4.22 Preview, Epic describes its real-time ray-tracing feature to be a "low level layer on top of UE DirectX 12 that provides support for DXR and allows creating and using ray tracing shaders (ray generation shaders, hit shaders, etc) to add ray tracing effects."

The hardware being reference here are the RT cores found in NVIDIA's "Turing RTX" GPUs. At the high-level, Unreal Engine 4 will support close to two dozen features that leverage DXR, including a denoiser for shadows, reflections, and ambient occlusion; rectangular area lights, soft shadows, ray-traced reflections and AO, real-time global illumination, translucency, triangular meshes, and path-tracing. We could see Unreal Engine 4.22 get "stable" towards the end of 2019, to enable DXR-ready games of 2020.