b123d-recognisers

Deterministic, geometry-only feature recognition for build123d solids and imported STEP models.

This is the standalone Apache-2.0 recognition layer extracted from Draftwright. It reports immutable geometric records and does not own drawing, manufacturing, editing, or consumer-cache policy.

Usage

Run the complete shared recognition orchestration when a consumer needs one consistent inventory:

from b123d_recognisers import build_recognition_result

result = build_recognition_result(part)
for hole in result.holes:
    print(hole.diameter, hole.depth, hole.through)

Individual recognisers remain public for focused consumers. Reusable evidence is explicitly injected so it is not rediscovered:

from b123d_recognisers import analyse_cylinders, recognise_hole_patterns, recognise_holes

cylinders = analyse_cylinders(part)
holes = recognise_holes(part, cyls=cylinders)
patterns = recognise_hole_patterns(holes)

Every recognise_* function returns a deterministic list of frozen dataclass records. Records provide to_dict() projections containing only JSON-serialisable geometry values. See docs/adr/0002-uniform-deterministic-recogniser-contract.md for the complete contract.

Migrated behavior

The initial 0.1 release series preserves the recognition behavior of Draftwright commit 3fe20b0f71a71deced06b310943dd44cc66e355e. The migration includes every public recogniser, shared cylinder/level substrates, the aggregate result, and feature_census. There are no feature policy changes; one previously platform-dependent numerical axis tie is normalized to the pinned baseline result. The checked-in semantic corpus records and continuously verifies the compatibility boundary; see migration/PARITY.md.

The dependency direction is:

consumer → b123d-recognisers → build123d/OCP

The runtime package does not import Draftwright and does not return build123d or OCP objects in public feature records.

Maintainers: see the release guide for the TestPyPI-first, OIDC-only publication process.

Licence

Apache License 2.0. See LICENSE, NOTICE, and THIRD_PARTY_NOTICES.md.

Project links

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  • Released:
Newer release available (0.4.16)

1 maintainer

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Credits

Author: Paul Fremantle

GitHub Statistics

Data verified by PyPI on Aug 15, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

Apache-2.0
View SPDX License List

Requires

Python <3.15, >=3.10

Tags

brep build123d cad feature-recognition step

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