AnalyticMusgrave Class Reference

Musgrave's original ridged multifractal terrain model. More...

#include <analyticfield.h>

Inheritance diagram for AnalyticMusgrave:

Public Member Functions
	AnalyticMusgrave (const double &, const double &, const double &, const double &, int, const double &, const double &, const Vector2 &=Vector2::Null)
	Constructor.
double	Value (const Vector2 &) const
	Compute the field function.
Public Member Functions inherited from AnalyticHeightField
	AnalyticHeightField ()
	Empty.
virtual double	Height (const Vector2 &) const
	Compute elevation at a given point.
virtual Vector	Normal (const Vector2 &) const
	Compute the normal to the field.
HeightField	CreateHeightField (const Box2 &, int, int) const
	Create a HeightField given an input domain.
double	Slope (const Vector2 &) const
	Compute the slope at a given point.
double	AverageSlope (const Vector2 &, int=8) const
	Compute the average slope at a given point.
double	Slope (const Vector2 &, const Vector2 &) const
	Compute the slope in a given direction and at a given point.
QVector< double >	Cross (const Vector2 &, const Vector2 &, int) const
	Compute the elevation along a segment.

Static Public Member Functions
static double	Ridge (double)
	Musgrave ridge function.
Static Public Member Functions inherited from AnalyticHeightField
static double	Ridge (const double &, const double &=0.0)
	Ridge function.

Protected Attributes
double	z0
	Base noise function, the same for all Musgrave fractal terrains.
double	amp
	Amplitude.
double	wave
	Wavelength.
double	lacunarity
	Hurst exponent.
int	octaves
	Number of octaves.

Additional Inherited Members
Static Protected Attributes inherited from AnalyticHeightField
static double	Epsilon = 1e-6
	Epsilon value used for gradient computation.

Detailed Description

Musgrave's original ridged multifractal terrain model.

Constructor & Destructor Documentation

AnalyticMusgrave()

AnalyticMusgrave::AnalyticMusgrave ( const double & z, const double & a, const double & wave, const double & lacunarity, int o, const double & gain, const double & H, const Vector2 & tt = Vector2::Null )

explicit

Constructor.

Parameters

z	Constant (base) elevation.
a	Vertical scaling factor.
wave	Starting wavelength.
lacunarity	Lacunarity.
o	Number of signals.
gain	Gain.
H	Hurst exponent.
tt	Offset vector.

Member Function Documentation

Ridge()

double AnalyticMusgrave::Ridge ( double y )

inlinestatic

Musgrave ridge function.

Should be applied to a noise function value. Ridges are created by taking the absolute value of the input signal, and squaring the result to amplify the ridged effect.

Parameters

y	Signal, should be a noise value in [-1,1].

Value()

double AnalyticMusgrave::Value ( const Vector2 & p ) const

virtual

Compute the field function.

Parameters

p

Point.

Reimplemented from AnalyticScalarField2.

Member Data Documentation

z0

double AnalyticMusgrave::z0

protected

Base noise function, the same for all Musgrave fractal terrains.

Base elevation.