A fast, experimental STEP file viewer

A STEP toolkit for Rust

cadrum is a Rust CAD crate using statically-linked, headless OpenCASCADE. Runs natively and in WebAssembly

OpenCascade (OCCT) compiled to WebAssembly — clean TypeScript API, ~4MB brotli, arena-based memory, structured errors, Web Worker support

Pure-Rust CAD geometry kernel — B-Rep topology, analytic surfaces, O(N) filament sweep, STEP AP203 export. No OCCT, no C++.

Provides truly zero-cost alternatives to Iterator::step_by for both incrementing and decrementing any type that satisfies RangeBounds<T: Copy + Default + Step>.

Single-file, in-browser STEP (ISO 10303) viewer — the example app for step-io

STEP/STP loader for bevy, using the foxtrot parser

Client-side STEP coaxial hole detection. Rust/WASM in the browser — files never uploaded. ITAR-safe structural manifests.

Breakform — Break the format. Keep the truth. Open interoperability layer for engineering data: schema, converters, honest fidelity reports.

Download models from the ABC (A Big CAD) dataset — Rust library and CLI supporting ids, ranges, chunks, and multiple CAD formats