Though this mesh looks like it has a lot of bumps and wrinkles, every vertex is intrinsically flat: the angles around each around each interior vertex sum to exactly 2π, which means the mesh can be flattened perfectly into the plane without any distortion of lengths, areas, or interior angles. (Such a flattening is stored in the texture coordinates.) The mesh may be useful for testing the isometry invariance of geometry processing algorithms, i.e., the degree to which their results are unchanged by motions of the vertex positions that do not change edge lengths, areas, etc.
Naively, one sometimes calls such a mesh “discretely developable,” though this
naive interpretation of developability neglects other important features of
smooth developable surfaces---such as the presence of straight lines passing
through each point of the surface. This phenomenon is studied in our paper on the developability of triangle meshes.
The mesh is stored as a Wavefront OBJ file with vertex and texture coordinates.