Chapter 2 Creating Primitives and Composites 37 Copyright Goodheart-Willcox Co., Inc. The INTERSECT command is also useful in 2D drawing. For example, if you need to create a complex shape that must later be used for inquiry calculations or hatching, draw the main object fi rst. Then, draw all intersecting or overlapping objects. Next, A B Figure 2-20. A—The solid primitives shown here have areas of intersection and overlap. B—Composite solids after using the SUBTRACT command. Joined first using the UNION command A B Figure 2-21. A—The solid primitives shown here have areas of intersection and overlap. B—Composite solids after using the INTERSECT command.