3D surface models
All the surface model drawings in this chapter have been constructed in a 2D Wireframe format on a Parallel grid system which can be set up as indicated in Fig. 18.1.
The three 3D cubes shown in the upper drawing of Fig. 18.2 have been constructed as follows:
Left-hand cube: using the Line tool Central cube: using the Box tool from the Modeling toolbar Right-hand cube: a box constructed using the surface command ai_box. The lower three drawings of Fig. 18.2 show the results of calling the Hide tool on each of the three upper drawings.