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1661

1652 Chapter 16: Material Editor, Materials, and Maps

both of these, you can rotate the gradient using

the angle parameter under Coordinates, which is

animatable.

Noise group

Amount—When nonzero (ranges from 0 to 1),

applies a noise effect. This per turbs the color

interpolation parameter using a 3D noise function

basedonU,V,andPhase.Forexample,agiven

pixel is halfway between the first and second color

(the interpolation parameter is 0.5). If noise is

added, the interpolation parameter would be

perturbedbysomeamountsothatitmaybecome

less or more than 0.5.

Regular—Generates plain noise. This is the same

as Fractal noise with the Levels setting at 1. When

the noise type is set to Regular, the Levels spinner

becomes disabled (because Regular is not a fractal

function).

Fr actal —Genera tes noise using a fractal algorithm.

The Levels option sets the number of iterations for

the fractal noise.

Tu rbulence —Generates fractal noise with an

absolute value function applied to it to make fault

lines. The noise amount must be g reater than 0 to

see any effects of turbulence.

Size—Scales the noise function. Smaller values

give smaller chunks of noise.

Phase—Controls the speed of the animation of the

noise function. A 3D noise function is used for the

noise. The first two parameters are U and V and

the third is phase.

Leve ls —Sets the number of fractal iterations or

turbulence (as a continuous function).

Noise Threshold group

When the noise value is above the Low threshold

and below the High threshold, the dynamic range

is st retched to fill 0–1. This produces a smaller

discontinuity at the threshold transition and thus

causes less potent ial aliasing.

Low—Sets the low threshold.

High—Sets the hi gh threshold.

Smooth—Helps make a smoother t ransition from

thethresholdvaluetothenoisevalue. When

smoothis0,nosmoothingisapplied.Whenitis1,

the maximum amount of smoothing is applied.

Gradient R amp Map

Material Editor > Maps rollout > C lick a Map button. >

Material/Map Browser > Gradient Ramp

Gradient ramp used for the layers of the cake

Gradient Ramp is a 2D map similar to the Gradient

map. I t shades from one color to another . In this

map, however, you can specify any number of

colors or maps for t he gradient. There are a variety

of controls, mak ing highly customized gradients

possible. Almost any par ameter of Gradient Ramp

can be animated.