Classical models are simple geometric shapes like Platonic solids, cones, cylinders, ellipsoids, ruled surfaces, and many others whose properties are well-known.
These models do not come from recent research. Beside completeness these models are included in this server since they are often used as basic building blocks and they provide simple test candidates for many numerical algorithms.
As a guide, meshes should have no holes, no degenerate triangles and elements, no duplicate vertices. Surfaces should have meshes with an adjacency relation.