This release is a pre-release and may not be stable for production use.
lightusd
Lightweight, dependency-free USD (Universal Scene Description) library for Python: load and author USDA / USDC / USDZ, resolve composition, and extract GPU-ready render data — with zero-copy NumPy interop.
Built on the LightUSD next core + tydra-next (no pxrUSD install required,
no legacy core in the wheel; native cmake -S . and WASM still
provide the legacy path via web/binding.cc). v1.0.0, npm preview
dist-tag. Wheels:
cp310-abi3— one stable-ABI wheel covers CPython 3.10+cp314t— native free-threaded (GIL-less) CPython 3.14 wheel
pip install lightusd
Reading
import numpy as np
import lightusd
stage = lightusd.load("scene.usdz") # usda / usdc / usdz, composed
for prim in stage: # depth-first traversal
print(prim.path, prim.type_name)
mesh = stage.prim_at("/World/Mesh")
points = np.asarray(mesh["points"]) # zero-copy (N, 3) float32
attr = mesh.attribute("xformOp:translate")
if attr.has_timesamples:
value = attr.get(time=12.0) # linear interpolation
print(mesh.relationship("material:binding").targets)
Authoring
st = lightusd.Stage.create()
st.up_axis = "Y"
grid = st.define_prim("/World/Grid", "Mesh")
grid.set("points", np.zeros((64, 3), np.float32), type="point3f[]")
grid.set("purpose", "render", uniform=True)
grid.set("xformOp:translate", (0.0, 1.0, 0.0), time=0.0)
st.set_default_prim("World")
st.save("out.usdc") # or .usda / .usdz
Render extraction (tydra)
from lightusd import tydra
scene = tydra.to_render_scene(stage) # triangulated, GPU-friendly
for mesh in scene.meshes:
vertices = np.asarray(mesh.points) # (N, 3) float32
indices = np.asarray(mesh.triangulated_indices) # (T,) uint32
material = scene.materials[mesh.material_id]
base_color = material.param("diffuse_color") # tuple or RenderTexture
Notes
- NumPy is optional (interop only, not a dependency).
lightusd.flatten_file(src, dst)runs a low-memory compose+flatten pipeline that streams large arrays through without decoding them.- Free-threaded CPython: concurrent reads of one
Stageare safe; do not author to a stage while other threads read it.
Apache 2.0. Part of LightUSD.
1 maintainer
Metadata
1 maintainer
Release files for lightusd 1.0.0rc4
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| lightusd-1.0.0rc4.tar.gz | 5.4 MB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| lightusd-1.0.0rc4-cp314-cp314t-win_arm64.whl | CPython 3.14 | CPython 3.14 free-threading | Windows ARM64 | Details |
| lightusd-1.0.0rc4-cp314-cp314t-win_amd64.whl | CPython 3.14 | CPython 3.14 free-threading | Windows x86-64 | Details |
| lightusd-1.0.0rc4-cp314-cp314t-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl | CPython 3.14 | CPython 3.14 free-threading | Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64 | Details |
| lightusd-1.0.0rc4-cp314-cp314t-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl | CPython 3.14 | CPython 3.14 free-threading | Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64 | Details |
| lightusd-1.0.0rc4-cp314-cp314t-macosx_11_0_arm64.whl | CPython 3.14 | CPython 3.14 free-threading | macOS 11.0+ ARM64 | Details |
| lightusd-1.0.0rc4-cp310-abi3-win_arm64.whl | CPython 3.10 | abi3 | Windows ARM64 | Details |
| lightusd-1.0.0rc4-cp310-abi3-win_amd64.whl | CPython 3.10 | abi3 | Windows x86-64 | Details |
| lightusd-1.0.0rc4-cp310-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl | CPython 3.10 | abi3 | Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 | Details |
| lightusd-1.0.0rc4-cp310-abi3-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl | CPython 3.10 | abi3 | Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64 | Details |
| lightusd-1.0.0rc4-cp310-abi3-macosx_11_0_arm64.whl | CPython 3.10 | abi3 | macOS 11.0+ ARM64 | Details |
Total release size: 16.9 MB
Release files / lightusd-1.0.0rc4.tar.gz
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