Epic Unreal Engine

Unreal Engine is the world’s most open and advanced real-time 3D creation platform. Continuously evolving to serve not only its original purpose as a state-of-the-art games engine, today it gives creators across industries the freedom and control to deliver cutting-edge content, interactive experiences, and immersive virtual worlds.


NVIDIA has made it easy for game developers to add leading-edge technologies to their Unreal Engine 4 (UE4) games by providing custom UE4 branches for NVIDIA technologies on GitHub.

Having custom UE4 branches on GitHub shortens the development cycle, and helps make games look more stunning. With these custom branches, developers can integrate NVIDIA technologies into UE4 games and deliver improvements within an hour.

GitHub Access

  1. Follow the instructions on the UE4 / GitHub page to link your Epic Games and GitHub accounts
  2. Access NVIDIA UE4 integrations at https://github.com/NvRTX/UnrealEngine
Note: you will get an ERROR 404 if you don't complete step 1 above and link your Epic Games and Github accounts.


The RTX branch is optimized for NVIDIA RTX GPUs and includes enhancements to the DXR support found in UE4.25 and UE4.26. It is ideal for developers adding ray tracing to their games or applications.

New in This Build:

  • World position offset simulation for ray traced instanced static meshes (beta)
    • Allows ambient motion of foliage like trees and grass
    • Uses approximate technique of shared animations to reduce overhead for simulating a full forest
    • Selectable per instance type
    • 4.25 & 4.26
  • Inexact shadows (beta)
    • Deals with potential mismatches of ray traced and raster geometry
    • Dithers shadow testing to hide potential artifacts
    • Enables approximations that improve performance in the management of ray tracing data
    • Useful for foliage heavy scenes
    • 4.25 & 4.26

Unique Branch Features:

  • Hybrid translucency
    • Combine raster and ray traced translucency in a single scene
    • Offers reduced resolution translucency tracing for improved performance
    • 4.25, 4.26, & earlier
  • Static geometry BVH visualization
    • Lets developers and artists view the geometric complexity of the scene from the perspective of ray tracing
    • Can help understand bad cases of BVH overlap
    • 4.25, 4.26, & earlier
  • Per-pixel timing of ray tracing effect cost
    • Lets developers understand expensive portions of their scene by using on-gpu counters
    • Supported for virtually all effects
    • 4.25 & 4.26

Back Version Support:

  • Integration of fixes and performance optimizations to older versions of the engine (presently 4.25)
    • Several race condition and memory management fixes back-ported
    • Threaded ray tracing material setup (large gain for CPU costs for ray tracing)
    • Image quality fixes

 GitHub RTX   NVIDIA RTX UE4 Branch Guide

NVIDIA RTX Caustics Branch

NVIDIA RTX Caustics Branch is an experimental version of our popular NVIDIA RTX Branch. It allows developers to integrate a suite of new features.

New features include:

  • The new hybrid translucency mode
  • Multi-bounce refraction optimization
  • Based on the latest NVIDIA RTX Branch
  • Mesh and Water caustics feature



If you are a developer interested in using DLSS with RTX in UE4, please apply separately to the DLSS Early Access Program. Developers will be approved based on the review of their application submission.
(Approvals in other NVIDIA Developer programs does not guarantee DLSS Early Access Program approval)

Learn More

VR Funhouse Mod Kit Source

VR Funhouse Mod Kit uses VRWorks, Turbulence, Destruction, FleX and Flow technologies. The complete source to the mod kit is available through GitHub.

 VR Funhouse Mod Kit Source

NVIDIA Project Sol

To showcase the ray tracing capabilities in new NVIDIA Turing GPUs, NVIDIA created Project Sol, a series of UE4 scenes that show off cinematic-quality rendering in real time running on a single NVIDIA Quadro RTX 6000.

NVIDIA and Epic have a long history of collaboration. UE4 is optimized for NVIDIA GPUs and Epic Games uses NVIDIA Tegra Android Development Pack and Nsight Tegra, Visual Studio Edition as their Android development environment for Windows PCs.

"Epic developed Unreal Engine 4 on NVIDIA hardware, and it looks and runs best on GeForce." Tim Sweeney, founder, CEO and technical director of Epic Games.

"NVIDIA's Tegra Android Development Pack (TADP) and Nsight Tegra Visual Studio Edition 3.5 enable a turnkey Unreal Engine 4 development environment for Android. These tools simplify installation of an Android development environment, and ensure that Visual Studio building and debugging of UE4 and NDK is completely seamless." Epic Games on NVIDIA Tegra Android Development Pack and Nsight Tegra.