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noodles

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Noodles is a GPU-accelerated node graph editor built with C++ and OpenGL, designed for OpenUSD pipelines. Features SDF-antialiased rendering, PySide6/Qt integration, and scales to 100K+ nodes with real-time performance.

// repository documentation

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# noodles

`noodles` is a standalone C++17 library for rendering interactive node graphs
with OpenGL. It provides the core rendering, layout, spatial indexing, and
undo/redo machinery used to display large directed graphs of nodes connected
by curved links — the kind of UI you see in shader editors, compositors, and
visual programming tools.

The library is host-agnostic: it does not create a window or own a GL
context. The consuming application provides a current OpenGL context and
calls `noodles` to draw into it.

## Status

🚧 Early-stage / experimental. The public C++ API may change without notice.

## Features

- GPU-accelerated rendering of node graphs with thousands of nodes
- MSDF (multi-channel signed distance field) text rendering for crisp,
  zoom-independent labels
- Curved Bezier links with forward and polyline rendering modes
- Spatial index for fast hit-testing and viewport culling
- Pluggable command-based undo/redo stack
- Animator for smooth interpolation of node positions and link geometry
- Cross-platform: Linux, macOS, Windows

## Repository Layout

```text
core/      Math primitives, node data model, render config, animator
render/    OpenGL renderers (nodes, links, text, stickers, font atlas)
spatial/   Spatial index for hit-testing
undo/      Command pattern + undo manager
assets/    Bundled fonts (Poppins, Baskerville) and GLSL shaders
tests/     GoogleTest-based unit tests
```

## Building

See [`BUILDING.md`](BUILDING.md) for full build instructions.

Quick start:

```bash
git clone https://github.com/facebookexperimental/noodles.git
cd noodles
cmake -S . -B build
cmake --build build
```

Third-party dependencies (GLEW, stb, RapidJSON) are fetched automatically
via CMake `FetchContent` if they are not already present on the system.

## Using `noodles` in your project

After `cmake --install build`, link against the installed library:

```cmake
find_package(noodles REQUIRED)
target_link_libraries(my_app PRIVATE noodles)
```

See the headers under `core/` and `render/` for the public API.

## Contributing

We welcome pull requests. See [`CONTRIBUTING.md`](CONTRIBUTING.md) for the
contributor workflow and Meta's CLA requirements.

## License

`noodles` is MIT licensed. See [`LICENSE.txt`](LICENSE.txt) for details.

This repository bundles third-party assets (Poppins and Baskerville fonts).
Their licenses are reproduced in [`THIRD_PARTY_LICENSES.txt`](THIRD_PARTY_LICENSES.txt).
Build-time dependencies fetched by CMake (GLEW, stb, RapidJSON) are also
acknowledged there.

noodles

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