9.5.2

890 • CHAPTER 18
THE SHADERS • 891
Color
Sets the base specular color for the specular component.
Intensity
Scales the specular Color to produce attenuation in the specular reection of the surface (this simply
means it makes the color darker when the value is close to zero and brighter when the value is closer
to 100% or above). The appropriate range is 0% - 1,000%.
Size
Sets the size of the specular reection. Appropriate value range for size is 0.001% - 200%.
Contrast
Provides contrast for the result of the specular sample color. Implements a standard contrast function.
Appropriate values are 0% - 100%.
Glare
Works with specular Intensity by using the edge falloff (multiplied by the Falloff scalar) to change
the intensity of the specular reection. This can be used to add a glare to the surface when a light is
reecting more on an edge or specular effects to reduce the specular reection when a light causes
a reection closer to the edge. Appropriate values run between 0% - 200%.
Falloff
Used to vary the falloff of the center of the object to the edge to affect the Glare intensity. Smaller
values cause the specular reection to reect the Intensity value more while larger values make the
surface use the Glare scalar more. Experimentation is required to fully understand this parameter.