Copyright Goodheart-Willcox Co., Inc. 320 AutoCAD and Its Applications—Advanced NOTE NOTE Remember that objects are drawn on the XY plane of the current UCS unless you enter a specifi c Z value. Therefore, before you draw an object to be imprinted onto a solid model, be sure you have set an appropriate UCS for proper placement of the object by using the UCS icon grips or a dynamic UCS. Alternately, you can draw the object on the XY plane and then move the object onto the solid object. Separate The Separate option separates two objects that are both a part of a single solid composite, but appear as separate physical entities. This can happen when modifying solids using the Boolean commands. The Separate option may be seldom used, but it has a specifi c purpose. If you select a solid model and an object physically separate from the model is highlighted, the two objects are parts of the same composite solid. If you wish to work with them as individual solids, they must fi rst be separated. To separate a solid body, select the command and pick the Body Separate option. If the button is picked in the ribbon, the option is directly entered. You are then prompted to select a 3D solid. After you pick the solid, it is automatically separated. No other actions are required and you can exit the command. However, if you select a solid in which the parts are physically joined, AutoCAD indicates this by prompting The selected solid does not have multiple lumps. A “lump” is a physically separate solid entity. In order to separate a solid, the solid must be composed of multiple lumps. See Figure 12-14. Shell A shell is a solid that has been “hollowed out.” The Shell option creates a shell of the selected object using a specifi ed offset distance, or thickness. To create a shell of a solid body, select the command and pick the Body Shell option. Remember, the option is directly entered when picking the button in the ribbon. You are prompted to select the solid. Only one solid can be selected. After selecting the solid, you have the opportunity to remove faces. If you do not remove any faces, the new solid object will appear identical to the old solid object when shaded or rendered. The thickness of the shell will not be visible. If you wish to create a hollow object with an opening, select the face to be removed (the opening). SOLIDEDIT Ribbon Home Solid Editing Solid Solid Editing Separate Type SOLIDEDIT SOLIDEDIT Ribbon Home Solid Editing Solid Solid Editing Shell Type SOLIDEDIT A B Figure 12-14. A—After the cylinder is subtracted from the box, the remaining solid is considered one solid. B—Use the Separate option to turn this single solid into two solids.