ABSTRACT
In the previous chapter we saw how to use matrix transformations as a tool for arranging geometric objects in 2D or 3D space. A second important use of geometric transformations is in moving objects between their 3D locations and their positions in a 2D view of the 3D world. This 3D to 2D mapping is called a viewing transformation, and it plays an important role in object-order rendering, in which we need to rapidly find the image-space location of each object in the scene.
