7.8 Three-dimensional interactive object drawing 251
Figure 7.8.1 Graphics display of codeobj3dshowing an object constructed of
surface patches.Problems
7.8.1. Run the codeobj3dto draw (a) a cube, and (b) a four-faced pyramid.7.8.2. Modify the codeobj3dand supporting functions to draw an object
defined by quadrilateral elements.