DDGI and Raytracing

DDGI

NVIDIA Readme:

UE5-PhysX-Vite/Engine/Plugins/Runtime/Nvidia/RTXGI at ue5Vite-release · GapingPixel/UE5-PhysX-Vite

GDC Presentation

Dynamic Diffuse Global Illumination

Ray-Traced Irradiance Fields:

DDGI Sample Scene, Setup, and combined usage with SSGI:

DDGI Plugin Settings:

Full Official RTXGI Playlist:

*DDGI in Vite has further integration with the RT pipeline from the NvRTX branches, in contrast to the 4.27 Launcher DDGI Plugin feature set. Including features such as Probe-Based RT Reflection (greatly improves the quality of RT reflections), among other integrations.

DDGI 1.1.5 Plugin

Launcher 4.27 Plugin: This is for Non Vite, Launcher 4.27 (do not use for Vite as it already has the plugin from the repo). Ideal for team members in a project who are not programmers. In many cases, a project can be developed using Vite, while artists and content creators continue to work on the same project through Unreal Engine 4.27 installed via the Epic Games Launcher.

Raytracing

On top of the UE4 raytracing features, Vite integrates changes from Nvidia branches NvRTX 4.27 and most of NvRTX 5.0. Also, AMD Open RT optimizations have been integrated (Vite has several AMD specific GPU optimizations for consoles)

Major features from here are RTXDI(Megalights alternative), RT Caustics, Enhanced Translucency and DLSS 3

At the End of Readme: GapingPixel/UE5-PhysX-Vite: Hyper performant UE Fork with Full-Suite 9th Gen features distinct to Epic's UE5. DDGI, PhysX, RTXDI, TressFX, Tessellation, SMAA, improved Tooling and general optimizations

Use the following commands to enable RT features:

IConsoleManager::Get().FindConsoleVariable(TEXT("r.GlobalIllumination.ExperimentalPlugin"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.SSGI.Enable"))->Set(1); // To be used in Tandem with DDGI for high frequency detail


IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.AmbientOcclusion"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.Reflections"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.Shadows"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.Translucency"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.ForceAllRayTracingEffects"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.SampledDirectLighting"))->Set(1);
IConsoleManager::Get().FindConsoleVariable(TEXT("r.RayTracing.MeshCaustics.Enable"))->Set(1);

A well-known title that used these RT features is Black Myth Wukong

Download the Abandoned Apartment Demo Project (from Nvidia)
https://drive.google.com/file/d/1OCb9sW9xH3FsFUza0ZG1tKWOPMMus5XA/view?usp=sharing

Download the Attic Demo Project and Build (from Nvidia)

Download Vite Tech Samples Project:
Vite_TechSamples.7z - Google Drive

13 January 2026