- n3xd_ocp.sample.face_grid: a face's UV grid of points and outward
normals in one GIL-free call, sampling exactly where np.linspace does
so a caller's fitted surface does not move.
- n3xd_ocp.helix: OCCT 8.0's TKHelix, which upstream does not bind at
all. Takes Python lists rather than NCollection_Array1. Two things the
header does not say, both found by probing: SetParameters wants N+1
diameters for N segments (one per boundary, so a taper interpolates),
and the builder is right-hand only -- a negative pitch is error status
12, not a mirrored helix.
- Bind BRepPrimAPI_MakeSphere and give inventory.py an EXTRA_SYMBOLS
addendum for symbols no app source imports. assay's gen_flow_fixtures
has been unrunnable since the 10C cutover for want of it; the gap was
wider than --check, since sigdiff is inventory-driven too.
Gates: 105 tests, 139/139 symbols, sigdiff clean, ASAN clean, wheel
self-contained with no libGL/libX11 DT_NEEDED.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HbTQ2HYWQwdtGmGJwypt6Z
- inventory.py --methods: report the instance methods the app calls per class,
plus chained calls that constrain a return type. --check says which classes
to bind; this says what to bind on them, which is what writing ~38 module
TUs needs.
- Drop StlAPI from the inventory: StlAPI_Writer has no app call site (the only
use was a test fixture, now on the app's own STL writer). 138 symbols / 47
modules.
- adding-symbols.md: scope the executing-constructor ban to the BRepAlgoAPI
booleans, which are the only classes with a deferred Set*/Build form —
BRepMesh_IncrementalMesh, GeomAPI_*, BRepCheck_Analyzer and friends compute
in their constructor by design and bind as stock. Replace the per-increment
app-test guidance: backend/tests/conftest.py imports n3xd.main, so no app
test can collect until the last module is bound. Increments gate on
stock-recorded fixtures here; the app suite is the Inc 4 gate.
- parity_venv.sh: run the ocp suite in the swapped venv (it imports only
OCP/n3xd_ocp, so it works throughout).
- Fix a stale macro name in occt_handle.h (ocp_new, not OCP_TRANSIENT_NEW) and
drop the unused ocp_transient_class helper.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DfriM8XUkn7uYf5Dwe2xo6
Builds n3xd-ocp end to end and publishes 7.9.3.1.dev1 to the Gitea registry,
where it installs anonymously and passes its suite.
- occt/Dockerfile: OCCT 7.9.3 compiled once into a manylinux_2_28 builder
image (base digest + tarball sha256 pinned), Draw/VTK/Tk/Xlib/OpenGL off,
FreeType on, -O2 without fast-math or march=native. A final layer asserts
TKService/TKV3d exist with no libGL/libX11 DT_NEEDED, which is what lets the
app image drop libgl1/libx11-6. Mounted into, never built FROM.
- scikit-build-core + nanobind STABLE_ABI -> one cp312-abi3 extension that
registers every OCP.* submodule via PyImport_AddModule, so `import
OCP.TopoDS` needs no shim and cls.__module__ is right. Version <occt>.N is
asserted against the OCCT found, keeping occt_version() truthful.
- occt_handle.h: type caster for opencascade::handle<T> over OCCT's intrusive
refcount. Wrappers are non-owning instances holding exactly one handle in
their keep-alive list, reusing an existing wrapper so identity survives a
round trip. Transient constructors go through ocp_new (never nb::init<>,
which would let OCCT delete nanobind's storage); the caster refuses a
refcount-0 object rather than corrupt the heap. Verified under ASAN with no
memory-safety errors, plus an RSS bound over 50k create/destroy cycles.
- Sub-shapes are returned by value everywhere, making the TShape lifetime class
that segfaulted a process-global face memo unrepresentable.
- Standard_Failure derives RuntimeError, with ~20 concrete types dispatched on
the dynamic OCCT type (cad_pool marshals failures home by type name).
- Inc 0 surface: gp subset, TopAbs, TopoDS (+ downcasts), TopExp, TopLoc,
TopTools, BRep, BinTools, Poly, Standard. 34 of the app's 139 symbols.
- n3xd_ocp: additive APIs kept out of the OCP namespace so parity testing stays
meaningful. bintools (shape <-> bytes, GIL-free, byte-identical) and _debug.
Two findings worth the record, both verified against the stock wheel rather
than assumed: upstream binds __hash__ but leaves __eq__ at identity, which is
exactly what geom_memo.py's hash-bucket + IsSame scan is built around, so we
match it instead of "fixing" it; and BinTools can release the GIL after all, by
slurping the file-like object instead of bridging a streambuf that would call
back into Python.
Gate: BREP round-trips are byte-identical to cadquery-ocp-novtk across six
fixtures (the generator asserts stock idempotency first). That matters beyond
IPC — derive.py content-addresses BREP payloads by sha256 and stores the ref.
