ABSTRACT
In Chapter 7 we studied planar graphics objects. In this chapter we return to the problem of describing and representing graphics objects with a focus on spatial graphics objects. The study of spatial graphics objects includes the mathematical modeling of objects from our physical world. The study of the geometry, topology, and representation of graphics objects is part of the area of geometric modeling. Geometric modeling was the first area in computer graphics that sought a robust formalization of its methods by introducing mathematical concepts.
