grill-usd-core

Unofficial, experimental WebAssembly (Pyodide) build of Pixar's OpenUSD Python bindings.

This package is not affiliated with or endorsed by Pixar Animation Studios, and it is not the official usd-core package. It is the testing distribution channel for the Pyodide/wasm build of the usd-core module set, maintained in the chrizzFTD/OpenUSD fork for the grill / pyrepl-web tooling.

What it is

The complete usd-core Python module set (Tf, Sdf, Usd, UsdGeom, … — no imaging), cross-compiled to wasm32 for Pyodide 314 (CPython 3.14, Emscripten ABI 2026_0, PEP 783 pyemscripten_2026_0_wasm32 wheel tag).

The C++ core ships once as a shared libusd_ms.so Emscripten side module vendored in grill_usd_core.libs/, with thin _*.so extension modules dynamically linking against it, plus the USD plugin registry under pxr/pluginfo/.

Installing

In a Pyodide 314 runtime (browser or Node):

import micropip
await micropip.install("grill-usd-core")

Or with pyrepl-web:

<py-repl packages="grill-usd-core"></py-repl>

Or natively into a pyodide venv:

pyodide venv .venv-pyodide
.venv-pyodide/bin/pip install grill-usd-core

Usage

The import name is pxr, exactly like the official usd-core:

from pxr import Usd, UsdGeom

stage = Usd.Stage.CreateInMemory()
world = UsdGeom.Xform.Define(stage, "/World")
cube = UsdGeom.Cube.Define(stage, "/World/Cube")
stage.SetDefaultPrim(world.GetPrim())
print(stage.GetRootLayer().ExportToString())

Caveats

• WebAssembly only. The wheel is pyemscripten_2026_0_wasm32 — it installs only under Pyodide 314 / Python 3.14 on Emscripten. There are no native (Linux/macOS/Windows) wheels here; use the official usd-core for those.
• Cannot coexist with usd-core. Both distributions own the pxr import package, so they cannot be installed into the same environment. In practice this never conflicts: usd-core publishes no Emscripten wheels.
• Experimental. This is an alpha-quality testing build; APIs match the upstream OpenUSD release it was built from, but the wasm port itself is young. No imaging (UsdImagingGL/usdview), no usdGenSchema/CLI tools.

Source and build

Built from the chrizzFTD/OpenUSD fork (build_scripts/pyodide/); see docs/pyodide/PLAN.md for the roadmap and a browser demo under extras/pyodide/demo/.

OpenUSD is licensed under the Tomorrow Open Source Technology License 1.0 (LicenseRef-TOST-1.0); see the bundled LICENSE.txt.