NVIDIA RTX Remix
RTX Remix is NVIDIA's open source modding platform for remastering classic DirectX 8 and 9 games with path tracing, DLSS and new physically based assets. It left beta in March 2025; version 1.5 shipped in June 2026. Its parts carry different open source licenses.123
Also known as RTX Remix, Remix, RTX Remix Toolkit, RTX Remix Runtime
At a glance
- What is it?
- RTX Remix has two halves. The Runtime runs alongside an old game, captures its scenes, swaps original assets for remastered ones as the game plays, and renders the result with a path tracer. The Toolkit is an offline editor, built on NVIDIA Omniverse, where modders import captured scenes, replace meshes and textures, add lights, and package mods. Assets are stored in OpenUSD, so they can move to tools such as Blender. Newer additions include Remix Logic for event-driven effects, a REST API and MCP server for automation, AI texture tools through ComfyUI, and Remix Skills that guide coding agents.145
- What does it do?
- Remix lets a modder turn a compatible game from the early 2000s into a path-traced version without the game's source code. The Runtime intercepts the game's DirectX 9 calls, identifies assets by hash and replaces them with new models and materials, then adds modern rendering features such as DLSS 4.5 Ray Reconstruction, Multi Frame Generation and Reflex. In the Toolkit, AI workflows generate physically based texture maps and upscale old textures, and Remix Logic reacts to in-game events, for example to change lighting when something happens.46
- Who needs it?
- Modders and small community teams who want to remaster older PC games they love, and graphics programmers who want to extend compatibility or rendering features in the open source runtime. Creating mods requires a Windows PC with a GeForce RTX GPU and time to learn 3D asset work.2
- What does it need?78
- Windows 10 or 11
- Any NVIDIA RTX GPU as a minimum for modding; NVIDIA recommends a GeForce RTX 4070 or higher with 12 GB of VRAM, 32 GB of RAM and an NVMe SSD
- A game that uses DirectX 8 or 9 with a fixed function pipeline (check the compatibility guide)
- For the AI texture tools: 8 GB or more of video memory on an NVIDIA GPU (NVIDIA recommends 12 GB or more), plus ComfyUI 0.3.72 or later for the Remix node pack
- For Runtime development: Visual Studio 2019 or newer, Windows SDK, Meson, Vulkan SDK and Python
- 3D modeling and texturing tools, such as Blender or Adobe Substance, for new assets
- What it is not
- RTX Remix is not a general tool for any game: it targets DirectX 8 and 9 games that use the fixed function pipeline, and games after about 2010 are generally not compatible without changes. It does not give access to a game's code or change gameplay; added objects are visual only. It is not an official remaster service, and publishers' rules on mods still apply. NVIDIA announced its exit from beta in March 2025, although the product page still carries an early access sign-up form.9
Availability and licensing. NVIDIA announced RTX Remix's official release, exiting beta, on 18 March 2025. The release notes list version 1.5 on 16 June 2026. It is downloaded through the NVIDIA app; the product page still shows an early access sign-up form next to the download link and shows no price. The source is public: rtx-remix is MIT, toolkit-remix is Apache-2.0, and dxvk-remix carries Zlib and NVIDIA MIT licenses. NVIDIA's March 2025 announcement says creating mods requires a GeForce RTX GPU, while finished mods run on hardware that can run Vulkan ray-traced games.127
The problem it solves
Many classic PC games still have active fan communities, but their graphics look dated, and remastering them normally needs the original source code and a professional studio.
Modders who try on their own must replace thousands of textures and models by hand and have no way to add modern lighting to an old fixed function renderer.
RTX Remix gives them a capture and replacement layer that works without source code, a path tracer that relights the scene, and AI tools that turn old low-resolution textures into physically based materials.
How it works
- Install. Download RTX Remix through the NVIDIA app and set up the Runtime for the game; runtime builds go in a .trex folder next to the game's executable.
- Capture. Play the game with the Runtime; the Remix bridge lets a 32-bit game use 64-bit memory, and the Runtime records scenes and assets.
- Ingest and replace. In the Toolkit, import the capture, replace meshes and textures with remastered assets, use AI tools via ComfyUI to generate PBR maps, and add or adjust lights.
- Add behavior. Use Remix Logic components to respond to game events, such as key presses or the presence of a mesh.
- Test live. The Runtime replaces assets by hash and renders the scene with path tracing and DLSS while you play.
- Package. Package the mod, optionally with RTX IO compression, and share it with players.
Automation runs through the Toolkit REST API and its MCP server, which exposes the same functions to AI agents.1610
Diagram as a list
Applications & solutions
- Classic DirectX 8 or 9 gameOriginal game issuing fixed function draw callsConnects to RTX Remix Runtime (dxvk-remix, bridge)
- RTX Remix Toolkit (built on Omniverse)Editor for ingesting captures, replacing assets and lightsConnects to Packaged mod (OpenUSD layers, RTX IO)
- Packaged mod (OpenUSD layers, RTX IO)What players install next to the gameConnects to RTX Remix Runtime (dxvk-remix, bridge)
Models & frameworks
- AI tools via ComfyUIGenerate PBR textures and upscale assetsConnects to RTX Remix Toolkit (built on Omniverse)
Inference & runtime software
- RTX Remix Runtime (dxvk-remix, bridge)Captures scenes and replaces assets during playConnects to Path tracer with DLSS and Reflex
- Path tracer with DLSS and ReflexRelights and renders the remastered scene
Operations & orchestration
- REST API and MCP serverAutomation and AI agent access to the ToolkitConnects to RTX Remix Toolkit (built on Omniverse)
Accelerated computing
- GeForce RTX GPU on WindowsRuns capture, editing and path tracingConnects to RTX Remix Runtime (dxvk-remix, bridge), RTX Remix Toolkit (built on Omniverse)
Capabilities
Runtime asset replacement and path tracing19
The Runtime captures game scenes, swaps assets by hash during play, and relights scenes with a path-tracing renderer, with DLSS 4.5 Ray Reconstruction and Multi Frame Generation available to modders.
Why it matters: Lets a remaster run inside the original game without source code.
Limits: Only works with compatible fixed function DirectX 8 and 9 games; compatible games can still crash or show visual issues.
Toolkit editor built on Omniverse111
An offline editor for ingesting captures, replacing assets, adding lights and packaging mods, using OpenUSD so assets move to other tools.
Why it matters: Gives modders one place to build and manage a remaster.
Limits: Packaging large mods needs care; RTX IO compression and override flattening were added in 1.5 to help.
Remix Logic35
A library of node components, added in release 1.3, that reads game state and triggers changes such as lighting or effects.
Why it matters: Allows effects that react to the game, not only static replacements.
Limits: Logic works with what the Runtime can detect; it does not change the game's own code or gameplay.
AI texture tools through ComfyUI8
Toolkit workflows submitted to ComfyUI for PBR texture generation, upscaling, style transfer and mesh processing, with results applied to the scene.
Why it matters: Speeds up turning low-resolution textures into physically based materials.
Limits: Needs a separate ComfyUI install and models downloaded from Hugging Face; AI output needs artistic review.
REST API, MCP server and agent skills101213
A Toolkit REST API, an MCP server that exposes those endpoints to AI agents, and Remix Skills instruction files that help coding agents work on the Remix code base.
Why it matters: Lets modders automate repetitive tasks and helps contributors extend compatibility with coding agents.
Limits: The MCP modding skill lists Toolkit 1.6.0 or later, newer than the latest published release notes (1.5); agent-written code still needs review and testing.
Open source components14151617
The combined repository is MIT and the Toolkit is Apache-2.0; the dxvk-remix Runtime carries the Zlib license of the original DXVK code plus an NVIDIA MIT license file. The Toolkit accepts outside pull requests under a contributor license agreement.
Why it matters: Community developers can fix compatibility issues and add features.
Limits: Licenses differ per repository and per file origin, and the older standalone bridge repository was archived in May 2025.
Debugging hooks for the Runtime18
The dxvk-remix Runtime source includes rtx.nsight options for self-injecting NVIDIA Nsight Graphics to take programmatic frame captures.
Why it matters: Helps contributors profile and debug rendering problems in a game.
Limits: The capture code sits behind a build switch that the header sets to off by default, the options default to off, and it needs a local Nsight Graphics install; it is aimed at developers, not players.
Practical use cases
A community team wants to remaster a fixed function DirectX 9 game it plays.
- Approach
- Check compatibility, capture key scenes with the Runtime, replace textures and meshes in the Toolkit, add lights, and package the mod.
- Role of NVIDIA RTX Remix
- Provides capture, asset replacement, path-traced rendering and packaging.
- Data, infrastructure and skills
- A compatible game, a GeForce RTX PC, 3D art skills and time for a long project.
- Type of benefit
- Visual modernization of a classic game
- Caveats
- Some games are only partly compatible; publishers' terms on mods apply.
- First step
- Run the game with the Runtime and check how many shaders it dumps, as the compatibility guide describes.
A modder has hundreds of low-resolution textures to upgrade.
- Approach
- Send textures through the Toolkit's ComfyUI AI workflows to create PBR maps and upscale them, then review and fix the results.
- Role of NVIDIA RTX Remix
- Automates the first pass of texture conversion.
- Data, infrastructure and skills
- ComfyUI with the Remix node pack, a GPU with at least 8 GB of VRAM, and an artist to review output.
- Type of benefit
- Less manual texture work
- Caveats
- AI-generated materials can look inconsistent and need artistic correction.
- First step
- Install ComfyUI and the RTX Remix node pack, then run one template workflow on a single texture.
A developer wants to make a previously unsupported game work with Remix.
- Approach
- Fork the relevant Remix repository, load the Remix Skills instruction files into a coding agent, and iterate on compatibility fixes before submitting a merge request.
- Role of NVIDIA RTX Remix
- Open source code plus agent guidance for contributing fixes.
- Data, infrastructure and skills
- C++ and graphics knowledge, Visual Studio, Meson and the Vulkan SDK.
- Type of benefit
- Wider game compatibility
- Caveats
- Fixes only help if the game's content is fixed function; shader-heavy games remain hard.
- First step
- Build dxvk-remix from source following its README.
Works with
Optional integration
- NVIDIA OmniverseThe RTX Remix Toolkit is built on NVIDIA Omniverse and stores assets in OpenUSD.
- NVIDIA Nsight Developer ToolsThe dxvk-remix Runtime can self-inject Nsight Graphics for programmatic frame captures.
Relationship labels follow NVIDIA's documentation. "Alternative approaches" does not mean one is better: each profile says when it fits.
Getting started
Check your game
Read the compatibility guide and the community compatibility table on ModDB; games from 2000 to 2005 using DirectX 8 or early DirectX 9 are the most likely to work.
Check: The game appears as working or the shader dump shows few shaders.
Check your PC
Confirm Windows 10 or 11 and an RTX GPU; NVIDIA recommends a GeForce RTX 4070 or higher.
Check: Your system meets the minimum in the technical requirements page.
Install Remix
Install RTX Remix through the NVIDIA app, then follow the Runtime and Toolkit setup guides.
Check: The Runtime overlay appears in game and the Toolkit opens a new project.
Capture and replace one asset
Capture a scene, ingest it in the Toolkit and replace one texture or mesh.
Check: The replacement appears when you play the game with the Runtime.
Try automation
Open the REST API docs at port 8011, or connect an MCP client to the Toolkit's MCP endpoint.
Check: An API call or agent tool call changes the project as expected.
Official resources
Could this technology help you?
Describe your project to the Solution Architect. It starts with NVIDIA RTX Remix as context but recommends independently, including when you do not need it.
Sources
Each statement above links to the source it comes from. Labels say who reported it.
- NVIDIA RTX Remix (product page) (opens in a new tab)
- Half-Life 2 RTX demo out now, RTX Remix officially released (GeForce News, 18 March 2025) (opens in a new tab)
- RTX Remix release notes (opens in a new tab)
- RTX Remix documentation: What is RTX Remix? (opens in a new tab)
- NVIDIA RTX Remix documentation (opens in a new tab)
- RTX Remix gets DLSS 4.5 Ray Reconstruction (GeForce News, 25 August 2026) (opens in a new tab)
- RTX Remix documentation: technical requirements (opens in a new tab)
- RTX Remix documentation: AI tools (opens in a new tab)
- RTX Remix documentation: game compatibility (opens in a new tab)
- RTX Remix documentation: MCP server (opens in a new tab)
- RTX Remix releases on GitHub (opens in a new tab)
- RTX Remix documentation: REST API (opens in a new tab)
- RTX Remix 1.5: AI agent skills for game modders (GeForce News, 16 June 2026) (opens in a new tab)
- NVIDIAGameWorks/rtx-remix repository (opens in a new tab)
- NVIDIAGameWorks/toolkit-remix repository (opens in a new tab)
- NVIDIAGameWorks/dxvk-remix repository (opens in a new tab)
- NVIDIAGameWorks/bridge-remix repository (archived) (opens in a new tab)
- dxvk-remix source: Nsight Graphics capture options (opens in a new tab)
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