Copyright Goodheart-Willcox Co., Inc. Chapter 16 Visual Style Settings and Basic Rendering 423 Changing any setting in the Visual Styles Manager redefi nes the visual style in the current drawing. Changes made using the ribbon are temporary and are not kept when a different visual style is set current. This is important to remember. 2D Wireframe When the 2D Wireframe visual style is set current, lines and curves are used to show the edges of 3D objects. Assigned linetypes and lineweights are displayed. All edges are visible as if the object is constructed of pieces of wire soldered together at the intersections (thus, the name wireframe). Either the 2D or 3D wireframe UCS icon is displayed. OLE objects will display normally as long as they are parallel to the viewing plane. If they are not parallel, only the OLE frame is visible. In addition, the drawing window display changes to the 2D model space context and parallel projection. For the 2D Wireframe visual style, the Visual Styles Manager displays the following categories. See Figure 16-8. • 2D Wireframe Options • 2D Hide—Occluded Lines • 2D Hide—Intersection Edges • 2D Hide—Miscellaneous • Display Resolution 2D Wireframe Options The Contour lines property controls the ISOLINES system variable. The setting is 4 by default. Isolines are suppressed when the HIDE command is used with the 2D Wireframe visual style set current. The Draw true silhouettes property controls the DISPSILH system variable. It is set to No by default, which is equivalent to a DISPSILH setting of 0. 2D Hide—Occluded Lines The Color property in this category controls the OBSCUREDCOLOR system vari- able. This property determines the color of occluded lines (obscured lines hidden from the view) when the HIDE command is used. The default setting is ByEntity. This means that, when displayed, obscured lines are shown in the same color as the object. The Linetype property controls the OBSCUREDLTYPE system variable. This prop- erty determines whether obscured lines are displayed and in which linetype they are displayed. The default setting is Off, which means that obscured lines are not displayed when the HIDE command is used. Selecting a linetype allows you to have obscured lines displayed instead of removed from the view. The available linetypes are: Solid, Figure 16-8. The categories and properties available for the 2D Wireframe visual style.