c6ace402dc
- Remove debug console.log statements from coroutine helpers - Split Tydra conversion into multiple phases with yields: - detecting: Format detection - parsing: USD parsing - setup: Converter environment setup - assets: Asset resolution setup - meshes: Tydra mesh conversion - complete: Done - Each phase yields to event loop, allowing browser repaints - Update progress-demo.js phase mapping with descriptive messages - The Tydra ConvertToRenderScene call is still blocking, but yields occur before and after it 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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. TinyUSDZ is beging built with C++20 to use C++20 coruntine to support async over JS/WASM boundary, without requiring sASYNCIFY and JSPI(JavaScript Promise Integration)
Standard WASM32 build (2GB memory limit)
$ ./bootstrap-linux.sh
$ cd build
$ make
WASM64/MEMORY64 build (8GB memory limit)
$ rm -rf build
$ emcmake cmake -DCMAKE_BUILD_TYPE=MinSizeRel -DTINYUSDZ_WASM64=ON -Bbuild
$ cd build
$ make
Memory Limit Defaults
- WASM32 (standard): 2GB default memory limit
- WASM64 (MEMORY64): 8GB default memory limit
The JavaScript wrapper automatically uses the appropriate native default based on the build architecture.
Note: WASM64/MEMORY64 requires browsers with MEMORY64 support (Chrome 109+, Firefox 102+ with flags enabled).
wasm module(tinyusdz.js and tinyusdz.wasm) will be output to js/src/tinyusdz folder.
See also: bootstrap-examples.sh for build configuration examples.
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.