In the previous chapters, we talked a bit about materials. You learned that a material, together with THREE.Geometry, forms THREE.Mesh. The material is like the skin of the object that defines what the outside of a geometry looks like. For example, a skin defines whether a geometry is metallic-looking, transparent, or shown as a wireframe. The resulting THREE.Mesh object can then be added to the scene to be rendered by Three.js. Until now, we haven't really looked at materials in much detail. In this chapter, we'll dive into all the materials Three.js has to offer, and you'll learn how you can use these materials to create good-looking 3D objects. The materials we'll explore in this chapter are shown in the following table: