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### 2D Shapes—A Foundation of Efficient Modeling

In this section, you learn a few important principles of working with 2D shapes that will be used as the basis for modeling more complex 3D objects. An understanding of the two principles—compound shapes and sub-object editing—will make quick work of many tasks that would be difficult without the fundamental knowledge of how the processes function. In Exercise 3.2, you create shapes that have no function other than to illustrate the principles that you will then apply to real models in the next section of this chapter:

• Compound shape— A compound shape is a shape made of two or more splines. You can use this principle to create very complex 3D objects that have voids and islands within the outer closed boundary of the shape.

• Sub-object editing— Each shape is comprised of three sub-objects: vertex, segment, and spline. A vertex is a nondimensional point in space, a segment is a line that connects two vertices, and a spline is an entity comprised of vertices and segments. A shape always has one spline, but can have an unlimited number.

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