https://github.com/icosa-foundation/three-icosa

three.js implementations of glTF extensions relating to Open Brush (and Tilt Brush) exports.
https://github.com/icosa-foundation/three-icosa

gltf gltf-extensions open-brush openbrush three three-js threejs tilt-brush tiltbrush

Last synced: 4 months ago
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three.js implementations of glTF extensions relating to Open Brush (and Tilt Brush) exports.

• Host: GitHub
• URL: https://github.com/icosa-foundation/three-icosa
• Owner: icosa-foundation
• License: apache-2.0
• Created: 2022-03-10T23:56:05.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2026-02-10T14:13:23.000Z (5 months ago)
• Last Synced: 2026-02-10T16:53:39.263Z (5 months ago)
• Topics: gltf, gltf-extensions, open-brush, openbrush, three, three-js, threejs, tilt-brush, tiltbrush
• Language: GLSL
• Homepage:
• Size: 12.1 MB
• Stars: 42
• Watchers: 6
• Forks: 5
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

          
# three-icosa - Open Brush / Tilt Brush glTF Extensions for three.js

[![Latest NPM release](https://img.shields.io/npm/v/three-icosa.svg)](https://www.npmjs.com/package/three-icosa)

[![Support us on Open Collective!](https://img.shields.io/opencollective/all/icosa?logo=open-collective&label=Support%20us%20on%20Open%20Collective%21)](https://opencollective.com/icosa)

[![Twitter](https://img.shields.io/badge/follow-%40IcosaGallery-blue.svg?style=flat&logo=twitter)](https://twitter.com/IcosaGallery)

[![Discord](https://discordapp.com/api/guilds/783806589991780412/embed.png?style=shield)](https://discord.gg/W7NCEYnEfy)

![Sample image showing a glTF file exported from Open Brush being rendered correctly in a three.js scene.](./banner.png)

`three-icosa` provides glTF extensions for [three.js](https://threejs.org) that allow for the correct rendering and animation of glTFs exported from [Open Brush](https://openbrush.app) and the now-discontinued Tilt Brush.

Specific extensions are required due to the shaders used to render Open Brush's unique brushes. These are currently implemented under the `GOOGLE_tilt_brush_material` extension originally written by Google.

This repository will also be home to extensions written by the Open Brush team for future brush enhancements, such as user-created brushes.

## Get

```

npm install --save three-icosa

```

You will also need a copy of the `brushes` directory from this repository. It is not distributed with this package through `npm` to save space. A GitHub hosted copy is available at the path: `https://icosa-gallery.github.io/three-icosa-template/brushes/`.

## Usage

Adding a new glTF extension is simple. our `GLTFGoogleTiltBrushMaterialExtension` only requires a path to a `brushes` directory (see above).

```js

import { GLTFGoogleTiltBrushMaterialExtension } from './three-icosa.module.js';

...

const scene = new Scene();

const gltfLoader = new GLTFLoader();

gltfLoader.register(parser => new GLTFGoogleTiltBrushMaterialExtension(parser, 'path/to/brush/folder/'));

gltfLoader.load('your_creation.glb' (model) => {

    scene.add(model.scene);

});

```

After registering the extension, it will automatically replace any detected Open Brush brushes.

## Limitations

Currently, the model will respond to the main directional light color for shading. However, the angle of the light is incorrect. We hope to have this fixed shortly.