stroblme
0ce43a94aa
119 of the app's 138 symbols now resolve; only the I/O modules and the Inc 4 tail are left. New: GCE2d, GCPnts, BRepFilletAPI, BRepOffsetAPI, ShapeAnalysis, ShapeFix, ShapeUpgrade, BRepCheck, BRepTools, BRepLib, BRepExtrema, BRepClass3d, IntCurvesFace, plus TopTools_HSequenceOfShape. The fillet and chamfer builders derive BRepBuilderAPI_MakeShape, so their history comes from the base bound in Inc 1 — which is what lets the app read a blend's provenance the same way it reads a boolean's. The Inc 2 gate compares that history exactly, alongside the splitter's, which is what sketch-region attribution depends on. Two shapes of deviation, both commented where they are bound: - Trailing enum arguments are left off four constructors (fillet's ChFi3d_FilletShape, MakeThickSolidByJoin's mode/join pair, BRepExtrema's Extrema flags, and Inc 1's GeomAPI_ProjectPointOnSurf). An unregistered enum cannot serve as a default argument — nanobind converts defaults at binding time, so it fails the whole module's import with std::bad_cast. The app never overrides any of them, so OCCT's own defaults apply and behaviour is unchanged. - ShapeAnalysis_FreeBounds.ConnectEdgesToWires reassigns a Handle& out parameter, which the caster cannot honour because it hands C++ a copy of the handle. The lambda splices the result into the sequence the caller passed, so the pass-empty-then-read shape the app uses still works. This is the one place upstream's holder semantics and ours differ observably. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DfriM8XUkn7uYf5Dwe2xo6
n3xd-ocp
Hand-written nanobind bindings for the
OpenCASCADE (OCCT) geometry kernel, covering exactly the surface the N3XD CAD
backend uses — 139 symbols across 48 OCP.* modules, not all of OCCT.
The package installs as a top-level OCP, so it is a drop-in replacement for
cadquery-ocp-novtk and the app's 442 import sites stay untouched.
Status: Inc 0 (spike) shipped — build system, OCCT builder image, handle
model, and the first module surface (gp, TopAbs, TopoDS, TopExp,
TopLoc, TopTools, BRep, BinTools, Poly, Standard), published as
7.9.3.1.dev1. BREP serialisation is byte-identical to the stock wheel, which
is the gate that mattered: the pools and the content-addressed derive payloads
both depend on it. Coverage is 34 of the 139 symbols the app imports; the rest
lands in increments 1-4 (roadmap 10C).
Start with docs/design.md for the decisions,
docs/building.md to build one, and
docs/adding-symbols.md to extend the surface. The
phase plan lives in the app repo at docs-private/reference/roadmap.md
(Phase 10).
Why
cadquery-ocp lags OCCT (it wraps 7.9.3; OCCT 8.0 shipped 2026-05), builds
Windows and macOS wheels we never use, and until recently forced a 638 MB VTK
dependency into the image. Binding call overhead is not a bottleneck — the
CAD hotspots live inside the C++ kernel — so this exists for version velocity,
footprint, and two defects that a binding we control prevents by construction:
- OCCT sub-shapes are returned by value, so a wrapper can never alias a
TShapewhose owner has died (this segfaulted a process-global face memo). - Executing constructors (the two-argument
BRepAlgoAPI_*forms) are not bound, so the double-execution footgun is unrepresentable.
It also releases the GIL around kernel calls and ships type stubs, neither of which upstream does.
Build
OCCT is compiled once into a builder image and reused; it is never built on the production host (4 cores, and a kernel build is multi-hour). Wheels are built here on a dev box and published to the Gitea package registry.
make image # once, ~40 min: compiles OCCT 7.9.3 into the builder image
make dev # inner loop: incremental compile + tests
make wheel # compile, stubs, auditwheel, self-containment smoke test
make publish # -> https://git.stroblme.de/api/packages/N3XD/pypi
Credentials go in .secrets (gitignored) as UV_PUBLISH_USERNAME /
UV_PUBLISH_PASSWORD. Consumers read anonymously — the package is public:
uv pip install --index-url https://git.stroblme.de/api/packages/N3XD/pypi/simple/ \
--prerelease=allow n3xd-ocp
Versions are <occt-version>.N, enforced at configure time against the OCCT
actually found, so the kernel a wheel wraps is readable from its version alone.
The registry refuses to republish a version; iteration builds therefore carry a
.devN suffix and are the only ones the registry's cleanup rule collects.