Three USDZ Loader


A basic USDZ (binary Universal Scene Description) reader for Three.js

The plugins supports animation as well as loading multiple USDZ at the same time.

Features

- Loads .USDZ files in ThreeJS (100% frontend, no backend required)
- Typescript types for the loader
- Loading multiple USDZ at the same time
- Animations are supported
- Works on latests browsers:
- Chrome
- Mozilla
- Edge
- Safari on Mac (> 15.2)
- Safari on iOS (> 15.2, might not work on all models due to memory limitations)

Demo

You may find an online demo implementation (with Vue + Vuetify + Typescript) of this package on usdz-viewer.net

The code of this demo is available on usdz-viewer.net's GitHub

How to use

a. Install three-usdz-loader with npm

``bash
npm install three-usdz-loader
`

b. The package uses WebAssembly dependencies. For those to work you have to place those in your public folder.
Copy the content of node_modules/three-gltf-loader/external to your /public folder

c. Make sure your web server has the proper headers to allow SharedArrayBuffer.
To do so, you must add the following headers when serving your frontend application (the syntax may depend on which server you are using):
`
"headers": [
{
"key": "Cross-Origin-Embedder-Policy",
"value": "require-corp"
},
{
"key": "Cross-Origin-Opener-Policy",
"value": "same-origin"
}
]
`

d. Use this example code to make it work in your ThreeJs context

`js
import { USDZLoader } from "three-usdz-loader";

...

// Setup the USDZ loader
// You may place external dependencies (.wasm / worker files) in a subfolder of the public folder.
// In this case, pass the path of this folder as an arg to the USDZLoader constructor
const loader = new USDZLoader();

// Create a ThreeJs Group in which the loaded USDZ model will be placed
const group = new THREE.Group();

// Add the group to the scene
this.scene.add(group);

// Load your file. File is of type File
const loadedModel = await loader.loadFile(file, group);

...

// Later on, if you need to cleanup the model from the scene, simply use
loadedModel.clean()

``

Limitations

The loader currently only works on browsers supporting SharedArrayBuffer as well as Atomics.

License - What's behind

This package is based on Autodesk's USD fork and aims to make Autodesk implementation easy to use from a NPM package.
The implementation has been done by Autodesk using WebAssembly. Please consult their GitHub for any further information on the WebAssembly/Emscripten side of things.