Reference:Granite Pattern

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The granite pattern uses a simple 1/f fractal noise function to give a good granite pattern. This pattern is used with creative color maps in to create some gorgeous layered stone textures.

As a normal pattern it creates an extremely bumpy surface that looks like a gravel driveway or rough stone.

Note: The appearance of the granite pattern depends on the noise generator used. The default type is 2. This may be changed using the noise_generator keyword. See the Pattern Modifiers section: noise_generator.