9.5.2

922 • CHAPTER 18
THE SHADERS • 923
Water
This shader generates water surfaces and is ideal for use in a material’s bump channel for simulating
water surfaces. It can simulate ripples and waves. Using the gradient, you can change the color of the
effect. U Frequency and V Frequency determine the neness of the structure. U=1 and V=1 create
radial wave patterns, while U=1 and V=0.25 give elongated wave fronts. The higher the values, the
higher the effective wave detail in that direction. T Frequency is the speed of the waves or ripples
in the U direction (0 means no movement, 2 doubles the speed of movement). Wind species the
amplitude of a wind that breaks up the water — the higher this, value the more the wind disturbs
the water’s surface.
Wood
This shader simulates wood patterns. The Type drop-down list denes the type wood that is simulated:
Custom, Walnut, Mahogany, Jacaranda or Pinewood. The gradient denes the color of the wood.
Increase the Frequency values for ner details in the X, Y and Z directions. Turbulence denes the
degree of growth irregularity (0% = even concentric annual rings, 100% = a more natural, uneven
ring appearance).