Copyright Goodheart-Willcox Co., Inc. 200 AutoCAD and Its Applications—Advanced NOTE NOTE Once the SLICE command has been used, the history of the solid to that point is removed. If a history of the work is important, then save a copy of the fi le or place a copy of the object on a frozen layer prior to performing the slice. Planar Object A second method to create a slice through a 3D solid is to use an existing planar object. Planar objects include circles, arcs, ellipses, 2D polylines, and 2D splines. See Figure 8-25A. The plane on which the planar object lies must intersect the object to be sliced. The current UCS has no effect on this option. Be sure that the planar object has been moved to the location of the slice. Then, select the SLICE command, pick the object to slice, and press [Enter]. Next, enter the Planar Object option and select the slicing path object (the circle, in this case). Finally, specify which side is to be retained. See Figure 8-25B. Again, if both sides are kept, they are separate objects and can be individually manipulated. Figure 8-25. Slicing a solid with a planar object. A—The circle is drawn at the proper orientation and in the correct location. B—The completed slice. A B Pick midpoints A B Figure 8-24. Slicing a solid by picking two points. A—Select two points on the cutting plane. The plane passes through these points and is perpendicular to the XY plane of the current UCS. B—The sliced solid.