9.5.2

932 • CHAPTER 18
THE SHADERS • 933
This group of parameters contains attributes of the veining function. The function is basically an
alternating gradient on the Y-axis that can be perturbed using a noise function.
Veigning Turbulence
Noise function used to perturb the veins (look up ‘noise types’ in the index).
Veigning Stirring
Amount of distortion applied to the veins.
Veigning Scale
The scale of the stirring noise function.
Veigning Octaves
Octaves of fractal detail used in the stirring function.
Veigning Size
Size of the veins (Surface1) to the body (Surface 2).
Veigning Contrast
Contrast applied to the veins to make them blend smoothly or separate distinctly.
Variance Turbulence
Noise function used to vary the veining.
Variance Amplitude
Amount of variance applied to the veins.
Variance Octaves
Octaves of fractal detail used in the variance function.