@cosmos.gl/graph

GPU-accelerated Force Graph

cosmos.gl is a high-performance WebGL Force Graph algorithm and rendering engine. All the computations and drawing occur on the GPU in fragment and vertex shaders, avoiding expensive memory operations. It enables the real-time simulation of network graphs consisting of hundreds of thousands of points and links on modern hardware.

This engine powers 🪐 Cosmograph — a toolset for exploring complex networks and AI embeddings.

📺 Comparison with other libraries

🎮 Check out our storybook for examples

Quick Start

Install the package:

npm install @cosmos.gl/graph

Note: luma.gl (@luma.gl/core, @luma.gl/engine, @luma.gl/shadertools, @luma.gl/webgl, compatible range ~9.3.0) is a peer dependency. npm 7+ installs it automatically; with Yarn, or pnpm configurations that skip auto-installing peers, add the four packages explicitly at ~9.3.0 — a bare install gets a newer luma.gl. Keeping luma.gl as a peer lets cosmos.gl share one luma.gl installation — and one GPU Device — with hosts like deck.gl.

Get the data, configure the graph and run the simulation:

import { Graph } from '@cosmos.gl/graph'

const div = document.querySelector('div')
const config = {
  simulationFriction: 0.1, // keeps the graph inert
  simulationGravity: 0, // disables the gravity force
  simulationRepulsion: 0.5, // increases repulsion between points
  curvedLinks: true, // curved links
  fitViewOnInit: true, // fit the view to the graph after initialization
  fitViewDelay: 1000, // wait 1 second before fitting the view
  fitViewPadding: 0.3, // centers the graph with a padding of ~30% of screen
  rescalePositions: false, // rescale positions, useful when coordinates are too small
  enableDrag: true, // enable dragging points
  onClick: (pointIndex) => { console.log('Clicked point index: ', pointIndex) },
  /* ... */
}

const graph = new Graph(div, config)

// Points: [x1, y1, x2, y2, x3, y3]
const pointPositions = new Float32Array([
  0.0, 0.0,    // Point 1 at (0,0)
  1.0, 0.0,    // Point 2 at (1,0)
  0.5, 1.0,    // Point 3 at (0.5,1)
]);

graph.setPointPositions(pointPositions)

// Links: [sourceIndex1, targetIndex1, sourceIndex2, targetIndex2]
const links = new Float32Array([
  0, 1,    // Link from point 0 to point 1
  1, 2,    // Link from point 1 to point 2
  2, 0,    // Link from point 2 to point 0
]);

graph.setLinks(links)

graph.render()

What's New in v3.0?

cosmos.gl v3.0 brings a new rendering engine, async initialization, and several new features:

• luma.gl (WebGL 2) — rendering ported from regl to luma.gl, with support for sharing a custom Device across multiple graphs via new Graph(div, config, devicePromise).
• Async initialization — the constructor returns immediately; all public methods queue until the device is ready. Use graph.ready / graph.isReady to know when the graph is usable.
• Simulation control — rendering is now separate from simulation. The simulation starts automatically by default; use start(), stop(), pause(), and unpause() to control it independently.
• Link sampling — sample visible links on screen with getSampledLinks() and getSampledLinkPositionsMap() for rendering labels or overlays along links.
• Touch and pen support — tap, drag, and pinch-to-zoom on phones and tablets. Long-press (~500 ms) triggers context menu callbacks. onMouseMove and all click callbacks fire from touch input.
• Context menu support — new callbacks for right-click on desktop and long-press on touch/pen: onContextMenu, onPointContextMenu, onLinkContextMenu, onBackgroundContextMenu.
• Fit viewport to points — setZoomTransformByPointPositions() zooms and pans to fit a set of points into view.
• Config-driven highlighting — imperative selection methods replaced by highlightedPointIndices, highlightedLinkIndices, and outlinedPointIndices config properties. Points and links are highlighted independently. Focused links are rendered wider via focusedLinkIndex / focusedLinkWidthIncrease. New findPointsInRect(), findPointsInPolygon(), getNeighboringPointIndices(), getConnectedLinkIndices(), and getConnectedPointIndices() methods.
• Link blending control — linkBlending: false disables alpha blending for significantly faster link rendering on dense graphs.
• Hover improvements — onPointMouseOver now includes isHighlighted and isOutlined parameters; hover correctly highlights the topmost point when points overlap.
• Config API changes — setConfig() now resets all values to defaults before applying; use the new setConfigPartial() to update individual properties without resetting the rest.
• Init-only config fields — initialZoomLevel, randomSeed, and attribution can only be set during initialization and are preserved across config updates.
• Runtime simulation toggle — enableSimulation can now be changed at runtime via setConfig() or setConfigPartial().
• GPU transitions — point positions, point colors/sizes, and link colors/widths now animate by default (transitionDuration: 800, transitionEasing: TransitionEasing.CubicInOut). Use transitionDuration: 0 to keep snap updates.
• Transition callbacks — use onTransitionStart, onTransition, and onTransitionEnd to track transition lifecycle and progress.
• Default point shape — new pointDefaultShape config property lets you set the fallback shape for all points when no per-point shapes are provided. Accepts a PointShape enum value (e.g., PointShape.Star), a plain number (e.g., 6), or a numeric string (e.g., "6").
• Collision force — new GPU-accelerated collision force keeps points from overlapping, using a spatial-hash grid that scales to large graphs. Enable it with simulationCollision, and tune the spacing with simulationCollisionRadius (fixed radius vs. size-derived) and simulationCollisionPadding (extra gap between points). See the Collision example.
• Exported defaults — defaultConfigValues is now part of the public API.
• Optimized hover detection — skips GPU work when the mouse hasn't moved.

Check the Migration Guide for upgrading from v2.

What's New in v2.0?

cosmos.gl v2.0 introduces significant improvements in performance and data handling:

• Enhanced data structures with WebGL-compatible formats.
• Methods like setPointPositions and setLinks replace setData for improved efficiency.
• Direct control over point and link attributes via Float32Array (e.g., colors, sizes, widths).
• Updated event handling based on indices instead of objects.
• New Point Clustering force (setPointClusters, setClusterPositions and setPointClusterStrength).
• Ability to drag points.

Check the Migration Guide for upgrading from v1.

Examples

• Actions

Showcase (via cosmograph.app)

• Silk Road Case: Bitcoin Transactions (📄 Read more)
• ABACUS Shell (source)
• The MathWorks, Inc: symmetric positive definite matrix (source)

Known Issues

• Starting from version 15.4, iOS has stopped supporting the key WebGL extension powering our Many-Body force implementation (EXT_float_blend). We're investigating this issue and exploring solutions. The latest iOS works again!
• cosmos.gl doesn't work on Android devices that don't support the OES_texture_float WebGL extension.

Documentation

• 🧑‍💻 Quick Start
• 🛠 Configuration
• ⚙️ API Reference
• 🚀 Migration Guide

License

MIT

Contact

GitHub Discussions