Figure 5 shows a typical example
made with our shader. The car
model in this example consists of
about 30 patches. We used a stan-dard shader to make the car image
in Figure 5a, where the highlight
area dominates the front window.
No matter how we chose εfor Hεin
Equation 1, the highlight area
would cover almost all the front
window, since it was almost flat. On
the other hand, as shown in Figure
5b, we successfully rendered the car
with our shader using rotation,
directional scaling, and split. The
highlight area indicates the win-dow’s material in a much more
impressive way than in Figure 5a.
Figure 6 illustrates how we can
apply post operations for making
the highlight variations. We applied
a few Boolean operations to make
the highlights on the spaceship in
Figure 6a. Figure 6b demonstrates
how we applied the sum and sub-traction operations to get the high-lights on the spaceship wing