Think for a moment of a wood shop, with all its various (and expensive)tools and machines. Some tools, like a screwdriver or a sander, are sim-ple, and others, like a lathe or router, are more complex, but they all change the wood (or models) in different ways. In some ways, you can think of modifiers as the tools and machines that work on 3D objects. Each woodshop tool has different parameters that control how it works, such as how hard you turn the screwdriver or the coarseness of the sandpaper. Likewise, each modifier has parameters that you can set that determine how it affects the3D object.
Modifiers can be used in a number of different ways to reshape objects, apply material mappings, deform an object’s surface, and perform many other actions. Many different types of modifiers exist. This chapter introduces you to the concept of modifiers and explains the basics on how to use them. The chapter concludes by exploring two different categories of modifiers that are used to deform geometry objects: Parametric Deformers and Free Form Deformers (FFD).