Before going on to the issues of lighting, rendering, and editing, there are a few more topics I'll cover here. In the first part of this chapter, I'll give you an idea of how you can use constraints to incorporate props smoothly into your character animations. The rest of the chapter is concerned with various ways to represent particular physical effects. For example, with lattices and mesh deformers, you can deform your meshes in ways that would not be easy or even possible using only bones. The softbody system simulates realistic soft object behavior, and with metaballs, you can create interesting effects that are not possible with meshes.