9.5.2

882 • CHAPTER 18
THE SHADERS • 883
 The second method of taking a “spread out” sample is to measure the average sample of a spherical
area (S) with radius (R). To do this properly, ChanLum needs to take random samples within this area.
The result will look noisy. This method not only makes the transition smoother but also gives the
object another interesting look. This is especially apparent if you increase the sample radius and add
a highlight (see below).