9.5.2

844 • CHAPTER 18
MATERIAL EDITOR • 845
If a random percentage is dened, the intensity of the glow in each animation frame is increased and
decreased in a random pattern, as follows:
 0%: No change
 100%: Maximum change
Frequency species how often the glow radius changes. The amplitude of the change is given by the
Random value.
 1Hz: The glow reaches a new random value after 1 second
 25Hz: The glow has a new value for each frame (for 25 fps), which causes
a icker
If Use Material Color is enabled, the glow is calculated on the basis of the material color rather than
the color specied here. If the option is disabled, the object and glow colors are mixed. For example,
green objects will appear yellowish under a red glow.
Figure 2 illustrates two examples of using glow. The glowing areas of the burning coals were created
with Use Material Color enabled. For the neon sign, only an outer glow was used.
The brightness slider does not have an effect when the Use Material Color checkbox is enabled.
When using object motion blur, glow applied to lights may cause colors to overlap.
Displacement
Displacement is similar to Bump, the difference being that here the object is actually (not just apparently)
deformed. This difference is best seen at object edges. In the sphere example below, the left half of the
sphere uses bump mapping, while the right half uses displacement mapping.