Copyright Goodheart-Willcox Co., Inc. Chapter 14 Model Documentation, Analysis, and File Exchange 383 These categories are discussed below. Examples of 2D and 3D sections inserted as blocks in the drawing are shown in Figure 14-45. Notice how properties can be set to show cutaway geometry in a different color and to change the section pattern, color, and linetype scale. Background Lines. The properties in the Background Lines category provide control over the appearance of all lines that are not on the section plane. You can choose to have visible background lines, hidden background lines, or both displayed. They can be emphasized with color, linetype, or line weight. The layer, linetype scale, and plot style can also be changed. These settings are applied to both visible and hidden background lines. Curve Tangency Lines. The properties in the Curve Tangency Lines category apply to lines of tangency behind the section plane. For example, the object shown in Figure 14-45 has a round on the top of the base. This results in a line of tangency behind the section plane where the round meets the vertical edge. You can have these lines displayed or suppressed. In general, lines of tangency are not shown in a section view. If you choose to display these lines, you can set the color, layer, linetype, linetype scale, plot style, and line weight of the lines. NOTE NOTE When a 3D section is created, you must turn off live sectioning to see the complete sectioned object in the block. With live sectioning on, only the cut surfaces appear in the block. Updating the Section View Once the section view is created, it is not automatically updated if the section object is changed. To update the section view, select the section object (not the block) and select the Generate Section Block option from the Generate panel in the Section Plane contextual ribbon tab. Then, in the Destination area of the Generate Section/Elevation dialog box, pick the Replace existing block radio button. If necessary, pick the Select block button and select the section block in the drawing. If you want to change the appearance of the section view, pick the Section Settings… button and adjust the properties as needed. Finally, pick the Create button in the Generate Section/Elevation dialog box to update the section block. The block is attached to the cursor Figure 14-44. Inserting a 2D section block.