Cylinders can be exported in one or more of the following ways: as centerlines, as full cylinders (solids), as tessellated faces, and as NURBS surfaces. Centerlines are just 3D lines that extend from one end of cylinder to other and no diameter information is output. Only formats that can handle lines (such as DXF, OBJ and VRML) can handle cylinder centerlines. Full cylinders are a solids description of a cylinder and currently only the VRML format handles it. Tessellated triangular faces are a set of triangles that describe the surface and the end planes of the cylinder appropriate for a package that works mostly with meshes and faces (such as 3D Studio). NURBS surfaces are three closely tied surfaces per cylinder (body and two end caps). Formats that can accept NURBS surfaces (OBJ, IGES, 3DM) can handle cylinders as NURBS surfaces.