Chapter 2 Creating Primitives and Composites 35 Copyright Goodheart-Willcox Co., Inc. Creating Composite Solids Creating Composite Solids A composite solid is a solid model constructed of two or more solids, often primitives. Solids can be subtracted from each other, joined to form a new solid, or overlapped to create an intersection or interference. The commands used to create composite solids are found in the Solid Editing panel of the Home tab or the Boolean panel of the Solid tab in the ribbon. See Figure 2-18. Introduction to Booleans Three operations form the basis of constructing many complex solid models. Joining two or more solids is called a union operation. Subtracting one solid from another is called a subtraction operation. Forming a solid based on the volume of overlapping solids is called an intersection operation. Unions, subtractions, and intersections as a B D A C V direction U direction Figure 2-17. A—A rectangular planar surface with four isolines in the U direction and eight isolines in the V direction. B—These two arcs and two lines form a closed area and lie on a single plane. C—The arcs and lines are converted into a planar surface. D—The planar surface is converted into a solid. Figure 2-18. Selecting a Boolean command in the Boolean panel on the Solid tab of the ribbon. These commands are also located in the Solid Editing panel on the Home tab. Boolean commands