9.5.2

892 • CHAPTER 18
THE SHADERS • 893
Radial
Creates a radial scratch pattern originating from the center of a plane that is parallel to the current
normal.
Radial Pattern
Creates a multi-origin radial scratch pattern that is parallel to the current normal.
Projection Scale
Scales the scratch algorithms that have an actual pattern (Radial Pattern is the only current algorithm
of this type to which scale applies).
X Roughness, Y Roughness
Scale the highlights in the X and Y directions dened by the Projection algorithm. The appropriate
range is 0.1% to 10,000%. If the X & Y roughness values are the same, the standard internal specular
algorithm is used.
Specular 1, Specular 2, Specular 3
These check boxes specify which specular channels will be affected by the anisotropic algorithm.
Amplitude
Scales the effect of the scratch of the specular highlights. The higher the value, the more scratched
the speculars will appear. The appropriate range is 0% - 100%.
Scale
Scales the scratch pattern itself. This applies to all scratch algorithms.
Length
Denes the scratch length in the space of the scratch pattern. Smoother milled surfaces would use
a higher scratch length and rougher surfaces would use smaller values. The appropriate range is 1%
- 1,000%.