# hannobraun/fornjot

Early-stage b-rep CAD kernel, written in the Rust programming language. No longer in development.

Repository: https://github.com/hannobraun/fornjot
Canonical: https://ross.abutalabs.com/products/fornjot
Language: Rust
License: NOASSERTION
License Family: other
Topics: rust, cad
Archived: true
Last push: 2026-06-19T19:36:41+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 88, release rhythm 8, longevity 100
- inputs: {"age_days": 1974, "days_push": 75, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2555, forks 134 (observed 2026-08-28T04:07:00.703209+00:00)

## What it is
Fornjot is an early-stage boundary representation (b-rep) CAD kernel written in Rust, designed as a foundation for building code-first CAD tools and applications. The project has been shut down and its goals were never reached, though the code remains usable for very simple models.

## Use cases
- build a code-first CAD application in Rust
- define 3D models programmatically with b-rep geometry
- experiment with CAD kernel internals
- create simple models for 3D printing
- integrate a CAD kernel into a game or graphics engine

## When to choose
- you want to study or fork an experimental Rust CAD kernel
- you only need very simple code-defined 3D models
- you're building a research or hobby CAD experiment

## When to avoid
- you need a production-ready CAD kernel for real-world use
- you require advanced modeling features or reliability guarantees
- you want a maintained project with active development

## Facets
- artifact type: library
- maturity: abandoned
- function: graphics, simulation, sdk
- domain: graphics, developer-tools, cross-platform
- platform: rust, cross-platform
- tags: cad-kernel, b-rep, code-cad, 3d-modeling, mechanical-cad

## Member repositories
- hannobraun/fornjot (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:00.703209+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:23:43.872118+00:00, confidence not recorded.
  - readme: https://github.com/hannobraun/fornjot (fetched 2026-08-28T04:07:00.703209+00:00, sha 935d8d048cf3)
- Data as of 2026-08-30T08:39:29.467469+00:00.