Copyright Goodheart-Willcox Co., Inc. Chapter 12 Solid Model Editing 321 After selecting the object and specifying any faces to be removed, you are prompted to enter the shell offset distance. This is the thickness of the shell. A positive shell offset distance creates a shell on the inside of the solid body. A negative shell offset distance creates a shell on the outside of the solid body. See Figure 12-15. If you shell a solid that contains internal features, such as holes, grooves, and slots, a shell of the specifi ed thickness is placed around those features. This is shown in Figure 12-16. If the shell operation is not readily visible in the current view, you can rotate the view by pressing the [Shift] key and pressing the mouse wheel button at the same time to enter the transparent 3DORBIT command. You can also rotate the view using the view cube, or you can see the results by picking the X-Ray Effect button in the Visual Styles panel on the Visualize tab of the ribbon. A B Figure 12-15. A—The right-front, bottom, and left- back faces (marked here by gray lines) are removed from the shell operation. B—The resulting object after the shell operation. B C A Figure 12-16. If you shell a solid that contains internal features, such as holes, grooves, and slots, a shell of the specified thickness is also placed around those features. A—Solid object with holes subtracted. B—Wireframe display after shelling with a negative offset. C—The Conceptual visual style is set current.