Subdivision surface

Mosaic (polygonal) models built iteratively on base mesh, with every iteration getting closer to the form of the modeled surface. Therefore, a subdivision surface has two elements – the base mesh and the algorithm of its smoothing. Subdivision surfaces are convenient to present smooth surfaces in a compact way. Such a quality is useful in exchanging 3D geometry models via Internet. Furthermore, subdivision surfaces become the basis for the new generation of geometry modeling of free-form surfaces.