Copyright Goodheart-Willcox Co., Inc. Chapter 10 Advanced Surface Modeling 243 A B 1 2 3 4 5 1 2 3 4 5 6 Figure 10-6. Network surfaces. A—Profiles 1–3 define the first direction of the surface and are shown in color. Profiles 4 and 5 define the second direction of the surface. The resulting surface model is shown in wireframe and shaded form. B—Profiles 1–4 define the first direction of the surface and are shown in color. Profiles 5 and 6 define the second direction of the surface. The resulting surface model is shown in wireframe and shaded form. A B Extruded surface Solid 1 2 3 4 Region Region Figure 10-7. Creating a network surface from the edges of existing objects. A—Two region edges (1 and 2) are selected to define the first direction of the surface. A surface subobject edge (3) and solid subobject edge (4) are selected to define the second direction of the surface. B—The resulting surface model.