# IfcOpenShell/IfcOpenShell

Open source IFC library and geometry engine

Repository: https://github.com/IfcOpenShell/IfcOpenShell
Canonical: https://ross.abutalabs.com/products/ifcopenshell
Language: C++
License: LGPL-3.0
License Family: copyleft
Last push: 2026-08-26T17:37:24+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 4041, "days_push": 7, "days_rel": 7, "gap_med": 0.0, "n_releases_24m": 1969}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2733, forks 952 (observed 2026-08-28T04:07:16.159701+00:00)

## What it is
IfcOpenShell is an open source C++ and Python library for parsing and working with Industry Foundation Classes (IFC) building models, including a geometry engine and format conversion tools. Its ecosystem includes IfcConvert for converting IFC models and Bonsai, a Blender add-on for graphical IFC authoring.

## Use cases
- parse and manipulate IFC building models in Python
- convert IFC files to OBJ, DAE, or other 3D formats
- author and edit native IFC models in Blender
- extract geometry from BIM models programmatically
- read and write BCF-XML issue files
- validate IFC files against IDS specifications

## When to choose
- you need open source, scriptable IFC parsing without vendor lock-in
- you want to build BIM tooling in C++ or Python
- you need a free graphical IFC editor via Blender
- you must support multiple IFC schema versions including IFC4x3

## When to avoid
- you need a lightweight web-based IFC viewer rather than a full library
- you require certified commercial BIM software support
- your workflow depends on proprietary CAD formats like Revit RVT natively

## Facets
- artifact type: library
- maturity: active
- function: parser, sdk, image-processing, cli, plugin-system
- domain: simulation, developer-tools, cross-platform, graphics
- platform: cpp, python, cross-platform
- tags: ifc, bim, building-information-modeling, geometry-engine, blender-addon, aec, cad, ifcconvert, bonsai, construction, desktop

## Member repositories
- IfcOpenShell/IfcOpenShell (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:16.159701+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 2026-08-30T02:14:29.184909+00:00, confidence not recorded.
  - readme: https://github.com/IfcOpenShell/IfcOpenShell (fetched 2026-08-28T04:07:16.159701+00:00, sha 3662abbeb81c)
- Data as of 2026-08-30T08:39:29.467469+00:00.