The material presented in this chapter will allow you to increase the complexity of the representations of the objects in your application by constructing more complex three-dimensional shapes. Choose the most appropriate threedimensional shapes introduced in this chapter to replace the polygonal approximations of the objects in your application with which you have been working so far. Be sure to include at least a few curved-surface objects, using the GLU and GLUT functions for generating spheres, ellipsoids, and other quadric and cubic surfaces. Use the shaded fill areas to render the objects, not wire-frame views. Choose a reasonable setting for the number of latitude and longitude lines used to generate the polygon mesh approximation to these curved-surface objects. Write routines to call the appropriate functions and display the shapes in the appropriate positions and orientations in the scene. Use techniques in hierarchical modeling to generate objects that are better approximated as a group of these more-primitive shapes if appropriate.