Copyright Goodheart-Willcox Co., Inc. 134 AutoCAD and Its Applications—Advanced NOTE NOTE The DELOBJ system variable allows you to delete or retain the original extruded objects and path defi nitions. This system variable has no effect when a surface extru- sion is created and the SURFACEASSOCIATIVITY system variable is set to 1 (the default setting), so as to maintain associativity with the original defi ning geometry. The DELOBJ system variable settings are: 0 All original profi le geometry (objects that were extruded) and path geometry is retained. 1 Profi le geometry is deleted. Path geometry is retained. 2 Profi le and path geometry is deleted. 3 Profi le and path geometry is deleted when the extruded entity is a solid. (This is the default setting.) –1 You are prompted to delete profi le geometry. Path geometry is retained. –2 You are prompted to delete all profi le and path geometry. –3 You are prompted to delete all profi le and path geometry when the extruded entity is a solid. Defi ning geometry is deleted for certain modeling operations that result in a solid. (This setting is necessary to maintain compatibility with older versions of AutoCAD.) The DELOBJ system variable also affects the REVOLVE, SWEEP, LOFT, CONVTOSOLID, CONVTOSURFACE, CONVTONURBS, and CONVTOMESH commands. A B Figure 6-5. A—Splines can be used as extrusion paths. Notice that the profile on the right is not perpendicular to the start of the path. B—The resulting extrusions.