Copyright Goodheart-Willcox Co., Inc. 326 AutoCAD and Its Applications—Advanced NOTE NOTE The Face Extrude option of the SOLIDEDIT command cannot be used to turn a copied face into a solid body. Creating a Shell The bottom surface of the original solid will now be shelled out. Keep in mind that features such as the four holes and the rectangular slot will not be cut off by the shell. Instead, a shell will be placed around these features. This becomes clear when the operation is performed. 1. Select the Shell option and pick the original solid. 2. Pick the lower-left and lower-right edges of the solid. See Figure 12-24A. This removes the two side faces and the bottom face. 3. Enter a shell offset distance of .15 units. The shell is created and the model should appear similar to Figure 12-24A. 4. Use the view cube or 3DORBIT command to view the solid from the bottom. Also, set the Conceptual visual style current. Your model should look like the one shown in Figure 12-24B. NOTE NOTE The SURFEXTRACTCURVE command allows you to extract curves such as lines, splines, polylines, or arcs from an existing surface, 3D solid, or face of a 3D solid. This enables the designer to create wireframe geometry that displays the contours of a surface. Once these new contours are created, the designer can use the geometry for 3D model design edits or for conceptual design purposes. Using the SURFEXTRACTCURVE command on 3D solid and surface models is discussed in Chapter 10. A B Edges picked to remove faces from the operation (two total) Figure 12-24. A—The shelled object. B—The viewpoint is changed and the Conceptual visual style is set current.