USD BRep

Boundary representation (BRep) solid modeling, with native import and export of BRep data to and from OpenUSD.

pip install usd-brep

import usd_brep

sphere = usd_brep.primitives.create_sphere((0.0, 0.0, 0.0), 1.0)
box = usd_brep.primitives.create_box((-0.5, -0.5, -0.5), 1.0, 1.0, 1.0)
cut = usd_brep.booleans.subtract(sphere, box)

usd_brep.usd.export_brep(cut, "cut.usda")
(brep,) = usd_brep.usd.import_breps("cut.usda")

Operations are grouped into submodule attributes — primitives, curves, surfaces, booleans, sweeps, fillets, offset, io, brep_ops, stitching, usd and more.

Requirements

• CPython 3.12, 64-bit
• Windows or Linux (x86_64, aarch64)
• On Windows, the Microsoft Visual C++ Redistributable

OpenUSD

The wheel bundles the OpenUSD runtime it was built against (25.11), so no separate install is needed and nothing is imported into the pxr namespace. Stages are exchanged as files rather than as Python objects, so no OpenUSD object ever crosses between this package and your own.

It can share a process with a different OpenUSD version, which has its own versioned symbol namespace: usd-core 26.8 alongside this package is tested and works on Linux. Loading another build of the same version in one process is not supported -- the namespaces coincide, so the dynamic loader may bind either copy's symbols. usd-core 25.11 on PyPI is such a build: do not install it in the same environment, because importing both crashes.

Validation

pip install "usd-brep[validation]" adds usd-validation-nvidia, with PyPI usd-core as its OpenUSD, and registers the BrepArray schema rules (BrepValidator) with it, so they run with the standard rules:

nvidia_usd_validate model.usda

The validation extra is not available on Linux aarch64, where PyPI has no usd-core.

The rules run in the validator's OpenUSD and do not import usd_brep. They use the omniSolid schema bundled in this wheel unless OMNISOLID_PLUGIN_PATH points to another copy. To run them without the plugin system, call brep_validator.register_all(), or use brep_validator.validate_file().

License

Apache-2.0. See the LICENSE file included in the distribution.