Copyright Goodheart-Willcox Co., Inc. 430 AutoCAD and Its Applications—Advanced Silhouette Edges Subcategory. This subcategory is available for each setting for the Show property in the Edge Settings category. The Show property in this subcate- gory controls the VSSILHEDGES system variable. It determines whether or not silhou- ette edges are displayed around the outside edges of all objects. The Width property controls the VSSILHWIDTH system variable. This property determines the width of silhouette lines. It is measured in pixels and the value can range from 1 to 25. Edge Modifi ers Subcategory. This subcategory is not displayed if the Show prop- erty in the Edge Settings category is set to None. The Line Extensions property controls the VSEDGELEX system variable. This property can be used to create a hand-sketched appearance by extending the ends of edges. See Figure 16-13A. In order to make changes to this property, the Line Extensions edges button must be on in the Edge Modifiers subcategory title bar. The value for the Line Extensions property can range from –100 to 100, which is the number of pixels. The higher the setting, the longer the extension. A negative value sets the extension length, but turns off the property. Picking the button makes the value positive and applies the effect (or makes the value negative and turns off the effect). The Jitter property controls the VSEDGEJITTER system variable. Jitter makes edges of objects look as if they were sketched with a pencil. See Figure 16-13B. In order to make changes to this property, the Jitter edges button must be on in the Edge Modifiers subcategory title bar. There are four settings from which to select: Off, Low, Medium, and High. The number of sketched lines increases at each higher setting. When the Show property in the Edge Settings category is set to Facet Edges, the Crease angle and Halo gap % properties are displayed in the Edge Modifiers subcat- egory. The Crease angle property controls the VSEDGESMOOTH system variable. This property determines how facet edges are displayed based on the angle between adja- cent facets. See Figure 16-14. The value can range from 0 to 180. This is the number of degrees between facets at which a line is displayed. The Halo gap % property is similar to the setting discussed earlier in the 2D Hide—Miscellaneous section however, this property controls the VSHALOGAP system variable. A B Figure 16-13. A—Line extensions have been turned on for this visual style. B—Jitter has been turned on for this visual style. Figure 16-14. A—The current visual style is set to Conceptual and the Crease angle property is set to 179. B—The Crease angle property is set to 10. Notice the edges between facets. A B