An advanced 3D Gaussian Splatting renderer for THREE.js

Built by World Labs.

Features

• Integrates with THREE.js rendering pipeline to fuse splat and mesh-based objects
• Portable: Works across almost all devices, targeting 98%+ WebGL2 support
• Renders fast even on low-powered mobile devices
• Render multiple splat objects together with correct sorting
• Most major splat file formats supported including: .PLY (also compressed), .SPZ, .SPLAT, .KSPLAT, .SOG
• Render multiple viewpoints simultaneously
• Fully dynamic: each splat can be transformed and edited for animation
• Real-time splat color editing, displacement, and skeletal animation
• Shader graph system to dynamically create/edit splats on the GPU

Check out all the examples

Getting Started

Copy Code

Copy the following code into an index.html file.

<style> body {margin: 0;} </style>
<script type="importmap">
  {
    "imports": {
      "three": "https://cdn.jsdelivr.net/npm/three@0.180.0/build/three.module.js",
      "three/addons/": "https://cdn.jsdelivr.net/npm/three@0.180.0/examples/jsm/",
      "@sparkjsdev/spark": "https://sparkjs.dev/releases/spark/2.3.1/spark.module.js"
    }
  }
</script>
<script type="module">
  import * as THREE from "three";
  import { SparkRenderer, SplatMesh } from "@sparkjsdev/spark";

  const scene = new THREE.Scene();
  const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.01, 1000);
  const renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  document.body.appendChild(renderer.domElement)

  const spark = new SparkRenderer({ renderer });
  scene.add(spark);

  const splatURL = "https://sparkjs.dev/assets/splats/butterfly.spz";
  const butterfly = new SplatMesh({ url: splatURL });
  butterfly.quaternion.set(1, 0, 0, 0);
  butterfly.position.set(0, 0, -3);
  scene.add(butterfly);

  renderer.setAnimationLoop(function animate(time) {
    renderer.render(scene, camera);
    butterfly.rotation.y += 0.01;
  });
</script>

CDN

<script type="importmap">
  {
    "imports": {
      "three": "https://cdn.jsdelivr.net/npm/three@0.180.0/build/three.module.js",
      "three/addons/": "https://cdn.jsdelivr.net/npm/three@0.180.0/examples/jsm/",
      "@sparkjsdev/spark": "https://sparkjs.dev/releases/spark/2.3.1/spark.module.js"
     }
  }
</script>

NPM

npm install @sparkjsdev/spark

Run Examples locally

Install Rust if it's not already installed in your machine.

Next, build Spark by running:

npm install
npm run build:wasm
npm run build

This will first build the Rust Wasm component (npm run build:wasm), then Spark itself (npm run build).

The examples fetch assets from a remote URL. This step is optional, but offline development and faster loading times are possible if you download and cache the assets files locally with the following command:

npm run assets:download

Once you've built Spark and optionally downloaded the assets, you can now run the examples:

npm start

This will run a dev server by default at http://localhost:8080/. Check the console log output to see if yours is served on a different port.

Develop and contribute to the project

Build troubleshooting

First try cleaning all the build files and re-building everything:

npm run clean
npm install
npm run build:wasm
npm run build

There's no versioning system for assets. If you need to re-download a specific file you can delete that asset file individually or download all assets from scratch:

 npm run assets:clean
 npm run assets:download

Ignore dist directory during development

To ignore the dist directory and prevent accidental commits and merge conflicts

git update-index --assume-unchanged dist/*

To revert and be able to commit into to the dist directory again:

git update-index --no-assume-unchanged dist/*

To list ignored files in case of need to troubleshoot

git ls-files -v | grep '^[a-z]' | cut -c3-

Build docs and site

Install Mkdocs Material

pip install mkdocs-material

If you hit an externally managed environment error on macOS and if you installed python via brew try:

brew install mkdocs-material

Edit markdown in /docs directory

npm run docs

Build Spark website

Build the static site and docs in a site directory.

npm run site:build

You can run any static server in the site directory but for convenience you can run

npm run site:serve

Deploy Spark website

The following command will generate a static site from the docs directory and push it to the repo that hosts the site via gh-pages

npm run site:deploy

Compress splats

To compress a splat to spz run

npm run assets:compress <file or URL to ply>