Mesh generation is the process of generating a mesh, which is a discrete geometric and topological subdivision of continuous geometric space. Meshes are utilized for computer screen rendering as well as physical simulations such as finite element analysis and computational fluid dynamics.
'Meshing' is used in hundreds of domains which might potentially apply to 'open spaces' at all sorts of scales, so it would be useful if you could expand your explanation or at least provide a citation for somewhere to start.