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NVIDIA RTX Remix Runtime Open Source Available Now

By NVIDIA on April 12, 2023 | Featured Stories GeForce RTX GPUs 
GeForce RTX Laptops NVIDIA DLSS NVIDIA Omniverse NVIDIA RTX NVIDIA
RTX Remix Ray Tracing

RTX Remix is a revolutionary modding platform to remaster classic
DirectX 8 and 9 games with path tracing, NVIDIA DLSS, AI-enhanced
textures, and user-created assets.

 

RTX Remix, part of the NVIDIA Studio suite of apps, is composed of
two core components that work together to enable modders to remaster
classic PC games: the RTX Remix creator toolkit, and a custom RTX
Remix runtime.

The RTX Remix creator toolkit, built on NVIDIA Omniverse and used to
develop Portal with RTX, allows modders to assign new assets and
lights within their remastered scene, and use AI tools to rebuild the
look of any asset. The RTX Remix creator toolkit Early Access is
coming soon.

The RTX Remix runtime captures a game scene, and replaces assets at
playback while injecting RTX technology, such as path tracing, DLSS 3
and Reflex into the game. Already, mod developers have been using the
RTX Remix runtime from Portal With RTX to create experimental ray
traced scenes in numerous classic games.

To further empower the mod development community to extend Remix's
game compatibility and feature set, NVIDIA is releasing the RTX Remix
runtime as open source on GitHub today.

[Pj08Ozo5OD]

The RTX Remix runtime is open source with a permissive MIT license,
and includes the following components:

  * USD capture and replacement modules, which are responsible for
    capturing a game scene to USD, and replacing original game assets
    with modded game assets at runtime.
  * Bridge, which translates the renderer from a x86 to a x64
    instruction set. This component uncaps the memory available for
    rendering.
  * Scene manager, which uses information coming through the D3D9
    fixed function API to create a representation of the original
    scene, track game objects frame to frame, and set up the scene to
    be path traced.
  * The core path tracer, which includes the rendering loop, the
    material handling, and the game specific rendering features
    (e.g., decals and particles). Please note, the various
    technologies (DLSS, NRD, RTXDI) that accelerate our path tracer
    and enable it to render in real time will continue to be
    available via their existing SDKs and licenses from the NVIDIA
    Developer portal.

Open sourcing unlocks numerous possibilities to extend the feature
set of the Remix runtime. A few examples of projects that advanced
mod developers might tackle via source code access include:

  * Making more of their favorite games compatible with Remix
  * Modernizing the fluid simulation to render smoke and fire with
    realistic volumetrics
  * Injecting custom post effects shaders in the runtime
  * Adding animated lights (e.g., flickering fire, or lights that
    cycle through colors)
  * Replacing animated character meshes
  * Changing camera positions in games (e.g., turning a first person
    game into an isometric one)
  * Incorporating virtual reality support into the renderer
  * Implementing dynamic conditional replacements (e.g., add fog or
    change a light in response to a player's position)

There is ample opportunity to change how classic titles are played,
and open source widens the possibilities beyond our imagination. We
look forward to seeing what mod developers will build with source
access.

For PC gamers, an open source RTX Remix runtime will help broaden the
variety of games with RTX mods and the types of mods themselves.

How To Get Involved

The RTX Remix runtime source code can be found on GitHub, and bugs
can be reported here.

Our main goal is to expand game compatibility and extend the features
of Remix in collaboration with the community. In keeping with that
aim, NVIDIA will accept pull requests on Github for code submissions
from the community, provide feedback, and help advance code until it
is mature enough to be merged into the official RTX Remix runtime.

To further help the community with Remix, several Remix engineers
have joined the community-led RTX Remix Showcase Discord server, are
providing guidelines on compatibility, and responding to mod
developers' questions about RTX Remix. If you are looking to get
started with your own Remix runtime open source project, head over to
the Discord to find subject matter experts to collaborate with. We
have also prepared some starter guides and documentation for mod
developers as we continue to prepare the RTX Remix application.

Modding is all about community, and providing an open source RTX
Remix runtime will help empower mod developers to expand Remix
compatibility to even more classic PC games. We look forward to
seeing how creators usher in this new era of modding with RTX Remix.

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