# Welcome to Geometry Central

Geometry-central is a modern C++ library of data structures and algorithms for geometry processing, with a particular focus on surface meshes.

Features include:

- A polished
**surface mesh**class, with efficient support for mesh modification, and a system of containers for associating data with mesh elements. - Implementations of canonical
**geometric quantities**on surfaces, ranging from normals and curvatures to tangent vector bases to operators from discrete differential geometry. - A suite of
**powerful algorithms**, including computing distances on surface, generating direction fields, and manipulating intrinsic Delaunay triangulations. - A coherent set of sparse
**linear algebra tools**, based on Eigen and augmented to automatically utilize better solvers if available on your system.

**Sample:**

```
// Load a mesh
std::unique_ptr<SurfaceMesh> mesh;
std::unique_ptr<VertexPositionGeometry> geometry;
std::tie(mesh, geometry) = readSurfaceMesh("spot.obj");
// Compute vertex areas
VertexData<double> vertexAreas(*mesh);
geometry->requireFaceAreas();
for(Vertex v : mesh->vertices()) {
double A = 0.;
for(Face f : v.adjacentFaces()) {
A += geometry->faceAreas[f] / v.degree();
}
vertexAreas[v] = A;
}
```

For more, see the tutorials. To get started with the code, see building. Use the sample project to get started with a build system and a gui.

**Related alternatives:**
CGAL,
libIGL,
OpenMesh,
Polygon Mesh Processing Library,
CinoLib

**Credits**

Geometry-central is developed by Nicholas Sharp, with many contributions from Keenan Crane, Yousuf Soliman, Mark Gillespie, Rohan Sawhney, and many others.

If geometry-central contributes to an academic publication, cite it as:

```
@misc{geometrycentral,
title = {geometry-central},
author = {Nicholas Sharp and Keenan Crane and others},
note = {www.geometry-central.net},
year = {2019}
}
```

Development of this software was funded in part by NSF Award 1717320, an NSF graduate research fellowship, and gifts from Adobe Research and Autodesk, Inc.