# flexible-collision-library/fcl

Flexible Collision Library

Repository: https://github.com/flexible-collision-library/fcl
Canonical: https://ross.abutalabs.com/products/fcl
Homepage: https://flexible-collision-library.github.io/
Language: C++
License: NOASSERTION
License Family: other
Topics: collision, collision-detection
Last push: 2026-06-03T20:02:07+00:00

## Health v2 (maintenance only)
Score: 61/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 85, release rhythm 8, longevity 100
- inputs: {"age_days": 5096, "days_push": 91, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1751, forks 444 (observed 2026-08-28T04:05:31.672941+00:00)

## What it is
FCL is a C++ library for performing proximity queries on pairs of geometric models composed of triangles. It supports collision detection, distance computation, tolerance verification, and continuous collision detection with optional contact information.

## Use cases
- detect whether two 3D meshes overlap
- compute minimum distance between geometric models
- check if two moving objects collide during motion
- verify two models are separated by a tolerance distance
- get contact points and normals from collisions
- perform collision checks on octrees from octomap
- collision checking for robotics motion planning

## When to choose
- you need fast collision or distance queries between triangle meshes or primitive shapes in C++
- you need continuous collision detection for moving models
- you're building robotics, physics simulation, or game collision systems
- you need octree-based collision checks with octomap integration

## When to avoid
- you need a full physics engine with dynamics and response forces
- you want a high-level game engine rather than a geometry library
- you need GPU-accelerated broad-phase collision for massive scenes
- you work outside C++ and can't bind to a native library

## Facets
- artifact type: library
- maturity: stable
- function: simulation, graphics, math
- domain: robotics, simulation, graphics
- platform: windows, cpp, cross-platform
- tags: collision-detection, distance-computation, proximity-queries, continuous-collision-detection, geometry, meshes, octree, algorithms, linux, macos

## Member repositories
- flexible-collision-library/fcl (main) score 61

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:31.672941+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 2026-08-30T03:28:33.137424+00:00, confidence not recorded.
  - readme: https://github.com/flexible-collision-library/fcl (fetched 2026-08-28T04:05:31.672941+00:00, sha 45c627d2459f)
  - homepage: https://flexible-collision-library.github.io/ (fetched 2026-08-29T11:06:22.623056+00:00, sha 36508fb61e8b)
- Data as of 2026-08-30T08:39:29.467469+00:00.