web

TinyUSDZ JS/WASM

Demo app

See demo folder. It uses npm package of tinyusdz, so no WASM building required.

Technical note on JS/WASM version of TinyUSDZ

Please see wiki https://github.com/lighttransport/tinyusdz/wiki/WASM-and-JavaScript-module

For library developers

See js folder for JS codes.

Building WASM module

Emscripten and emcmake required.

See /.github/workflows/wasmPublish.yml or

$ ./bootstrap-linux.sh
$ cd build
$ make

wasm module(tinyusdz.js and tinyusdz.wasm) will be output to js/src/tinyusdz folder.

Note

• asyncify is disabled since it increases code size ~2.5x

Code size

tinyusdz.wasm

2025/05. emsdk 4.0.8. -Oz : 1.6 MB 2025/06. emsdk 4.0.9. -Oz : 1.9 MB

zstd compression

we recommend to use zstd compression for wasm binary in the deployment. for example, 1.9MB tinyusdz wasm can be compressed to 400KB with -19 compression level.

Prepare wasm.zstd

$ zstd -19 tinyusdz.wasm

See js/src/tinyusdz/TinyUSDZLoader.js to how to load zstd compressed wasm.

stack size

128k => ok. 64k => ok.

npm packaging

See npm folder and <tinyusdz>/.github/workflows/wasmPublish.yml for npm publish.