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Pure Stochastic Patterns

Patterns which appear to have no regularity or shape are deemed "pure" stochastic functions. They include clouds, marble, fire, stone, granite, etc.

rmarble is an example of a shader with a pure stochastic pattern. The marble-like coloring is created by computing turbulence and using that value to index into a color spline. There is only one parameter, veining, besides the plastic illumination model parameters. veining controls the frequency of the marble -- higher frequency turbulence yields more "veins."

rmarble.sl

Displaced Turbulence

dturb.sl
Note: this image will look very different rendered
with BMRT since BMRT does not implement true displacement mapping

Fire

fire.sl
(fire.mv, 370K SGI Movie)

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Last Modified: 4/16/96