Icosahedron

An icosahedron has 20 similar regular triangular faces. The following examples show the same Icosahedron using different projections:

     default_focus.set(3, 0, -10, 2, 0, 10, 10);
     Icosahedron i(origin, 3);
     i.draw();
     

Fig. 45.

Fig. 46.

Fig. 47.

Fig. 48.

In [next figure] , i is filldrawn. In this case, the surface hiding algorithm has worked properly. See Surface Hiding.

Fig. 49.