Since we will be using complex models, such as cars, we'll need to develop shaders that can render the different materials of our models. This should be relatively simple, since the shaders we've developed already handle diffuse, specular, and ambient components for materials. In Blender, we will select the option to export materials when generating the OBJ files. Blender will then generate a second file known as the Material Template Library (MTL). For the best results, our shaders will use Phong shading and Phong lighting, with support for multiple lights.