C# Class Accord.Math.PerlinNoise

Perlin noise function.

The class implements 1-D and 2-D Perlin noise functions, which represent sum of several smooth noise functions with different frequency and amplitude. The description of Perlin noise function and its calculation may be found on Hugo Elias's page.

The number of noise functions, which comprise the resulting Perlin noise function, is set by Octaves property. Amplitude and frequency values for each octave start from values, which are set by InitFrequency and InitAmplitude properties.

Sample usage (clouds effect):

 // create Perlin noise function PerlinNoise noise = new PerlinNoise( 8, 0.5, 1.0 / 32 ); // generate clouds effect float[,] texture = new float[height, width]; for ( int y = 0; y < height; y++ ) { for ( int x = 0; x < width; x++ ) { texture[y, x] =  Math.Max( 0.0f, Math.Min( 1.0f, (float) noise.Function2D( x, y ) * 0.5f + 0.5f ) ); } }

ファイルを表示 Open project: accord-net/framework

Public Methods

Method	Description
Function ( double x ) : double	1-D Perlin noise function.
Function2D ( double x, double y ) : double	2-D Perlin noise function.
PerlinNoise ( ) : System	Initializes a new instance of the PerlinNoise class.
PerlinNoise ( int octaves, double persistence ) : System	Initializes a new instance of the PerlinNoise class.
PerlinNoise ( int octaves, double persistence, double initFrequency, double initAmplitude ) : System	Initializes a new instance of the PerlinNoise class.

Private Methods

Method	Description
CosineInterpolate ( double x1, double x2, double a ) : double	Cosine interpolation.
Noise ( int x ) : double	Ordinary noise function
Noise ( int x, int y ) : double
SmoothedNoise ( double x ) : double	Smoothed noise.
SmoothedNoise ( double x, double y ) : double

Method Details

Function() public method

1-D Perlin noise function.

public Function ( double x ) : double
x	double	x value.
return	double

Function2D() public method

2-D Perlin noise function.

public Function2D ( double x, double y ) : double
x	double	x value.
y	double	y value.
return	double

PerlinNoise() public method

Initializes a new instance of the PerlinNoise class.

public PerlinNoise ( ) : System
return	System

PerlinNoise() public method

Initializes a new instance of the PerlinNoise class.

public PerlinNoise ( int octaves, double persistence ) : System
octaves	int	Number of octaves (see property).
persistence	double	Persistence value (see property).
return	System

PerlinNoise() public method

Initializes a new instance of the PerlinNoise class.

public PerlinNoise ( int octaves, double persistence, double initFrequency, double initAmplitude ) : System
octaves	int	Number of octaves (see property).
persistence	double	Persistence value (see property).
initFrequency	double	Initial frequency (see property).
initAmplitude	double	Initial amplitude (see property).
return	System