1. RTX-Dev for Unreal Engine 4

RTX-Dev describes a family of branches NVIDIA publishes on GitHub to help developers and content creators get more out of the ray tracing support in UE4. These branches demonstrate practical solutions to issues which NVIDIA has directly encountered or discovered through cooperative work with partners. All branches attempt to faithfully match the behavior of their parent engine branch, while bringing additional performance, features, or bug fixes. Whenever a change is not a pure improvement on the base code, it is implemented as a configurable option. Some of the features contained in RTX-dev branches are back ported from later Epic release branches to enable the improvements on a stable codebase. In other cases, features from older RTX-Dev branches have migrated into UE4 release branches.

Deep Learning Super Sampling (DLSS) is another NVIDIA RTX technology that uses the power of deep learning and AI to improve game performance while maintaining visual quality. DLSS helps players achieve smooth frame rates with graphically-intensive settings, such as the various raytracing effects. This article provides a high level overview over DLSS in the combined RTX and DLSS branches.

2. RTX-Dev Branches

The combined RTX & DLSS branches can be found on the NvRTX GitHub Repository and are the suggested starting point for the majority of developers.

The various raytracing in-development and topic branches can be found on the NVPhysX GitHub repository.

2.1. rtx-dlss-4.24.3

This branch has the following features:

  • Same raytracing features as RTX-4.24.

  • Deep Learning SuperSampling (DLSS), as discussed in the DLSS section.

2.2. RTX-4.25

RTX-Dev branch for developers working from UE 4.25.

2.3. RTX-4.24

RTX-Dev branch for developers working from UE 4.24.

2.4. RTX-4.23

Continuation of RTX-Dev efforts for developers working from the 4.23 release.

2.5. RTX-4.22

First release branch of RTX-Dev work, intended for anyone needing support against 4.22.

2.6. RTX-Dev

Our original branch, bringing a round of optimizations that simply missed the 4.22 release. This branch is deprecated, and all work has migrated to release-specific branches.

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