Graphics Programs Reference
Geometric transformation requires per-axis factors, whereas coordinate transforma-
tion requires viewing information. This information consists of the viewer's (eye)
position, the center of observation, and the normal (“vector” quantity) to the viewer's
head (as indicated by the orange arrow over the Blender camera in Figures 3-19 and
Using projection transformation, an object that is far from the viewer appears smal-
ler. This transformation provides a perspective into the 3D scene using a viewing
volume, as indicated by the (blue) frustum in Figure 3-21 .