Wire-Frame Models:

The wire-frame model is maybe the oldest way of representing solids. According to this model, any solid is represented by its edges & vertices. A wire-frame model has two tables, the vertex table and the edge table. Each of the entry of the vertex table records a vertex and its coordinate values, while each of entry of the edge table contain two components giving the two incident vertices of that edge. A wire-frame model does not have face information. For example, a cube given in Figure is described by eight vertices and 12 edges. One needs the following Tables (a) and (b) for complete information on the cube.

                    Table: (a) Vertex Coordinates and (b) Edge Information

                         (a)                                                                             (b)