opencad

The OpenCAD core: geometry kernel, constraint solver, feature tree, and the fluent modelling API — with no web framework and no network dependency.

Install:

pip install opencad          # pydantic + numpy only
pip install "opencad[occt]"  # add the OCCT B-rep backend
pip install "opencad[full]"  # OCCT + scipy solver + networkx graph analysis

Use:

from opencad import Part, Sketch

profile = Sketch(name="Plate").rect(80, 30).circle(3, center=(8, 8), subtract=True)
plate = Part().extrude(profile, depth=4, name="Plate")
plate.fillet(edges="all", radius=1.0)

Every fluent call appends a node to a rebuildable feature DAG, which you can serialize, edit, and replay. See the repository ARCHITECTURE.md for the kernel/solver/tree design and TOPOLOGY.md for topological naming.

Packages

Related distributions

• opencad-agent — natural-language modelling on top of this package
• opencad-backend — FastAPI HTTP service exposing all of the above

Tests

pytest

The suite runs against this package alone. A few integration tests exercise repository files (examples/, docs/schemas/) and skip automatically when the package is tested outside a monorepo checkout.