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Technical illustration can be imitated in computer graphics by using
black edge lines, a single light source, tone and undertone shading
with highlights as presented in Gooch et al., and no shadows. For a
NURBS-based model, displaying silhouettes, surface boundaries, and
discontinuities provides shape information similar to that of
traditional technical illustrations. In the next chapter, I will
discuss some algorithms for finding these silhouettes, boundaries, and
discontinuities using geometric information of NURBS surfaces. I will
also mention some of the other possibilities for generating edge lines
for polygonal objects, like the work of Markosian et al., as well as
some image processing techniques.