To create a 3D object in CG one assembles its surface, or a good likeness, with help of 2D primitives. For example, the seemingly 3D solid ball and torus in the screenshot Figure 8.1, seen originally in Chapter 4, are actually depicted by their respective 2D surfaces. Note that the calls glutSolidSphere() and glutSolidTorus() in ballAndTorusLitOrthoShadowed.cpp to draw these surfaces refer to filled triangles, not solid 3D objects. Boris's head in Figure 8.2 is a mesh of quads.
Figure8.1:Screenshot of ballAndTorusLitOrthoShadowed.cpp.
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