====== Noise and turbulence functions for texture patterns ======

===== Primitive: Gardner Solid Noise =====
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**Definition**: Series(x)*Series(y)*Series(z) with Gardner's series

**Call**: hfA_NoiseG(x,freq,phase);

**Parameters**:

x - point coordinates array \\
freq - noise frequency \\
phase - phase for the series \\

**Output** : A value in [0,1]

**Test file**: [[http://www.hyperfun.org/HF2/Language/Library/Attri_Lib/hffiles/hfA_NoiseG.hf|hfA_NoiseG.hf]]
===== Primitive: Perlin Solid Noise =====
{{http://www.hyperfun.org/HF2/Language/Library/Attri_Lib/images/hfA_noiseP.JPG?200x200&nolink}}\\
**Definition**: Interpolation of random value

**Call**: hfA_NoiseP(x);

**Parameters**:

x - point coordinates array

**Output**: A value in [-1,1]

**Test file**: [[http://www.hyperfun.org/HF2/Language/Library/Attri_Lib/hffiles/hfA_NoiseP.hf|hfA_NoiseP.hf]]

===== Primitive: Turbulence (using Perlin's noise) =====
{{http://www.hyperfun.org/HF2/Language/Library/Attri_Lib/images/hfA_turbulence.JPG?200x200&nolink}}\\
**Definition**: Perlin's Turbulence function

**Call**: hfA_Turbulence(x,freq);

**Parameters**:

x - point coordinates array\\
freq - frequence of the turbulence

**Output**: A value in [0,1]

**Test file**: [[http://www.hyperfun.org/HF2/Language/Library/Attri_Lib/hffiles/hfA_Turbulence.hf|hfA_Turbulence.hf]]