# nmwsharp/geometry-central

Applied 3D geometry in C++, with a focus on surface meshes.

Repository: https://github.com/nmwsharp/geometry-central
Canonical: https://ross.abutalabs.com/products/geometry-central
Homepage: https://geometry-central.net
Language: C++
License: MIT
License Family: permissive
Last push: 2026-06-13T19:26:31+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 87, release rhythm 52, longevity 100
- inputs: {"age_days": 3208, "days_push": 81, "days_rel": 106, "gap_med": 411, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1334, forks 182 (observed 2026-08-28T04:04:24.899985+00:00)

## What it is
Geometry Central is a modern C++ library of data structures and algorithms for geometry processing, with a particular focus on surface meshes. It provides a polished halfedge mesh class, geometric quantities from discrete differential geometry, algorithms like surface distance and direction fields, and sparse linear algebra tools built on Eigen.

## Use cases
- process and modify 3D surface meshes in C++
- compute geometric quantities like normals and curvature on meshes
- compute geodesic distances on surfaces
- generate direction fields on meshes
- work with intrinsic Delaunay triangulations
- solve sparse linear systems for geometry problems
- build geometry processing research prototypes

## When to choose
- you need a modern, header-friendly C++ library focused on surface mesh geometry processing
- you want discrete differential geometry operators and algorithms out of the box
- you want efficient mesh modification with data containers tied to mesh elements
- you want Eigen-based sparse linear algebra with automatic solver upgrades

## When to avoid
- you need a broad computational geometry library covering non-surface geometry like CGAL
- you need volumetric or point-cloud-only processing as the primary focus
- you need Python-first tooling (only third-party bindings like Potpourri3d exist)
- you need rendering or a full GUI, which is delegated to tools like Polyscope

## Facets
- artifact type: library
- maturity: stable
- function: simulation, math, graphics, developer-tools
- domain: graphics, computer-vision, simulation, developer-tools
- platform: cpp, cross-platform, windows
- tags: geometry-processing, surface-meshes, discrete-differential-geometry, mesh-processing, eigen, computational-geometry, algorithms, linux, macos

## Member repositories
- nmwsharp/geometry-central (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:24.899985+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 2026-08-30T04:44:34.314829+00:00, confidence not recorded.
  - readme: https://github.com/nmwsharp/geometry-central (fetched 2026-08-28T04:04:24.899985+00:00, sha f37586a97186)
  - homepage: https://geometry-central.net (fetched 2026-08-29T12:03:48.412364+00:00, sha 95218f7434ef)
- Data as of 2026-08-30T08:39:29.467469+00:00.