32 AutoCAD and Its Applications—Advanced Copyright Goodheart-Willcox Co., Inc. display of contour lines and silhouettes on spheres and other curved 3D surfaces for a given visual style. See Figure 2-14. With the Visual Styles Manager displayed, select the 2D Wireframe image tile. The Contour lines setting in the 2D Wireframe options area establishes the number of lines used to show the shape of curved objects. A similar setting appears in all of the other visual styles if their Show property in the Edge Settings area is set to Isolines. The default value is four, as shown in Figure 2-13A, but it can be set to a value from zero A B C D Figure 2-13. Different displays of spheres established with visual style settings. A—The Draw true silhouettes setting is No and four contour lines are used. B—The Draw true silhouettes setting is No and 20 contour lines are used. C—The Draw true silhouettes setting is Yes and four contour lines are used. D—The Draw true silhouettes setting is Yes and the HIDE command is used with the 2D Wireframe visual style set current. Pick Number of contour lines Silhouette setting Figure 2-14. The 2D Wireframe options area of the Visual Styles Manager is used to control the display of contour lines and silhouettes on spheres and other curved 3D surfaces in a given visual style.