Graphics Programs Reference
In-Depth Information
Figure 3-20 . Viewing transformation, changing viewer's position
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
3-20 ).
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 .
Figure 3-21 . Viewing volume
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