BREP_cam

BREP_cam is the CAM engine of the BREP CAD kernel. Its Rust library target is brep_cam. It is pure Rust and builds for native targets and for wasm32-unknown-unknown, so the same code generates toolpaths in the desktop application and in the browser worker.

The crate holds the shared CAM contract every strategy builds on:

• model: setups (rigid model-to-machine transform, work offset, stock, clearance heights), machines, tools and holders, operations with one typed parameter set per strategy, target references by stable body/face identity, and the toolpath as an ordered stream of typed motions with per-operation diagnostics.
• numeric: the single tolerance object all algorithms read.
• mesh: the immutable triangle snapshot that keeps each triangle's source body and face.
• index: the triangle spatial-index trait and its implementations.
• cutter: cutter profiles (flat, ball, bull, cone/V, ball-cone) with validated dimensions.
• cancel: cancellation and progress reporting at bounded work chunks.

All algorithms work in machine coordinates with the cutter axis along +Z; the setup transform is the only place model coordinates become machine coordinates. Output is deterministic: the same inputs produce a byte-identical motion stream.

Build it from the repository root:

cargo build --manifest-path BREP_cam/Cargo.toml

The public package contains production sources, the manifest, README, and license. The default runtime dependencies are serde and serde_json.

Enable the optional schema feature to derive JSON Schemas for persisted CAM model types, including strategy parameters. The automation host uses these schemas to describe CAM state.