Gmsh 3D Mesh Generator

Gmsh is an open-source 3D finite element mesh generator with a built-in CAD engine and post-processing sub-system. Developed by Christophe Geuzaine and Jean-Francois Remacle since 1996, originally at the University of Liege, Belgium, the project has evolved into one of the most widely used mesh generation tools in computational science and engineering. Key features include: built-in CAD kernel (parametric 2D and 3D geometry definition using points, lines, splines, surfaces, and volumes via a scripting language, plus import of STEP, IGES, and BREP files via OpenCASCADE), mesh generation algorithms (structured and unstructured 2D and 3D meshes using Delaunay, Frontal-Delaunay, MeshAdapt, and other algorithms, supporting triangular, quadrangular, tetrahedral, hexahedral, and prismatic elements), high-order mesh generation (curved elements up to arbitrary polynomial order for high-fidelity FEM computations), adaptive mesh refinement (anisotropic refinement based on error estimators), boundary layer meshing (for fluid dynamics with boundary layer elements), mesh size fields (controlling element size based on distance, curvature, analytic expressions, or imported scalar fields), post-processing (handling scalar, vector, and tensor fields on points, lines, surfaces, and volumes, with animation and cross-section views), multi-physics integration (tight integration with GetDP, ONELAB, and major FEM solvers including FreeFEM, FEniCS, and MOOSE), and scripting (a domain-specific language for complete automation of geometry creation, meshing, and post-processing).