bherbruck
f43fa44feb
Newton-Raphson N-d solver (SolveIt), finite-difference Jacobian, boundary handlers; difftest compares the full Evaluate trace of a shared test equation set (3043 cases, bit-identical). Wires SmTol::GetScaledZero(const SmEvalNFunctionsObject&) in geom::tol. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
solidcore
solidcore is a Rust port of NVIDIA's SMLib: a boundary-representation (B-rep) solid modeling kernel in safe Rust (SMLib is from USD BRep, Apache-2.0).
Solids are exact: shells, faces, loops, edges and vertices bound to analytic and NURBS curves and surfaces. solidcore's first consumer is SolidCraft.
Scope
In scope: the SMLib kernel and the SM_API operation layer of upstream — NURBS
math, curve and surface geometry, B-rep topology, intersections, booleans, fillets and
chamfers, offset/shell, sweeps and skins, primitives, healing/stitching, mass
properties and queries.
Out of scope: upstream's OCCT translators, USD/Hydra integration and Python bindings. See ATTRIBUTION.md.
Goals: no unsafe in the kernel, no panics on bad input, deterministic results, no
global state, builds for wasm32-unknown-unknown, and numerical agreement with the
C++ to 1e-9 relative with identical topology, verified unit by unit.
Status
Early. The workspace, foundation types (math, error, kernel, topology) and the
C++ comparison harness are in place; algorithm modules are being ported unit by unit.
Per-unit state lives in plan/modules.toml and the summary in
plan/STATUS.md.
Layout
| Path | Contents |
|---|---|
crates/solidcore |
The kernel library |
crates/solidcore-ffi |
extern "C" bindings to the upstream C++ (feature cpp) |
crates/difftest |
Runs Rust and C++ side by side on the same inputs |
harness/cpp |
Builds the upstream C++ reference into bin/cpp; FFI shims |
plan/ |
Unit list, port order, status, findings |
upstream/ |
Local clone of usd-brep at c9c5979 (gitignored) |
bin/ |
All build output (gitignored) |
Building
Requires the stable toolchain (pinned by rust-toolchain.toml, which also installs
rustfmt, clippy and the wasm32-unknown-unknown target). Cargo output goes to
bin/ (see .cargo/config.toml).
cargo build -p solidcore
cargo test -p solidcore
cargo fmt --all --check
cargo clippy --workspace --all-targets -- -D warnings
cargo check -p solidcore --target wasm32-unknown-unknown # wasm check
Optional: export RUSTC_WRAPPER=sccache to share compilation caches.
Difftest (Rust vs C++)
git clone https://github.com/NVIDIA-Omniverse/usd-brep upstream
git -C upstream checkout c9c5979
harness/cpp/build.sh # C++ reference -> bin/cpp
cargo run -p difftest --features cpp -- --green # all units marked green
cargo run -p difftest --features cpp -- --unit <unit id> # one unit
solidcore-ffi and difftest compile without the C++ build; only the cpp feature
links it.
Contributing
Read AGENTS.md: rules, code style, and the claim/port/difftest/merge workflow.
Licence
Apache-2.0. See LICENSE, NOTICE and ATTRIBUTION.md. solidcore is an independent project, not affiliated with or endorsed by NVIDIA.