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10. Filters > The feTurbulence Element

The feTurbulence Element

The <feTurbulence> elements lets you produce artificial textures for effects like marble, clouds, etc. by using equations developed by Ken Perlin. An excellent summary is available at http://freespace.virgin.net/hugo.elias/models/m_perlin.htm. You specify these attributes:

type

One of turbulence or fractalNoise. Fractal noise is smoother in appearance.

baseFrequency

The larger the number you give as the value for this attribute, the more quickly colors change in the result. This number must be greater than zero and should be less than one. You may also give two numbers for this attribute; the first will be the frequency in the x direction and the second will be the frequency in the y direction.


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