BoundedNoisePlane Class Reference

Infinite plane with spatially bounded surface noise (Perlin noise). More...

#include <CD_BoundedNoisePlane.H>

Inheritance diagram for BoundedNoisePlane:

Collaboration diagram for BoundedNoisePlane:

Public Member Functions
	BoundedNoisePlane (const std::string a_orientation, const RealVect a_point, const RealVect a_clampLo, const RealVect a_clampHi, const Real a_clampK, const Real a_noiseAmp, const RealVect a_noiseFreq, const Real a_persistence, const int a_octaves, const bool a_reseed=false)
	Full constructor. More...
	BoundedNoisePlane (const BoundedNoisePlane &a_inputIF)
	Copy constructor. More...
virtual	~BoundedNoisePlane ()
	Destructor (does nothing)
virtual Real	value (const RealVect &a_pos) const
	Value function. More...
virtual BaseIF *	newImplicitFunction () const
	Factory method. More...

Protected Attributes
std::pair< int, int >	m_normal
	Plane normal. This is in the form of a coordinate direction and a sign.
RealVect	m_point
	Plane point.
RealVect	m_clampLo
	Low clamped value.
RealVect	m_clampHi
	Low clamped value.
Real	m_clampK
	Transition length.
Real	m_maxAmp
	Maximum noise amplitude.
RefCountedPtr< BaseIF >	m_plane
	BaseIF function for a plane without noise.
RefCountedPtr< BaseIF >	m_perlin
	Noise function.

Detailed Description

Infinite plane with spatially bounded surface noise (Perlin noise).

The surface noise is bounded by a smoothed boxcar function between the input arguments. The boxcar function is given by b(x) = h(x-a) - h(x-b) where h(x) = 1/(1 + exp(-2*k*x)) where k determines the falloff.

Constructor & Destructor Documentation

BoundedNoisePlane() [1/2]

BoundedNoisePlane::BoundedNoisePlane	(	const std::string	a_orientation,
		const RealVect	a_point,
		const RealVect	a_clampLo,
		const RealVect	a_clampHi,
		const Real	a_clampK,
		const Real	a_noiseAmp,
		const RealVect	a_noiseFreq,
		const Real	a_persistence,
		const int	a_octaves,
		const bool	a_reseed = false
	)

Full constructor.

Parameters

[in]	a_orientation	Plane orientation. Must be x+, x-, y+, y-, etc
[in]	a_point	Point on the plane
[in]	a_clampLo	Low clamped corner.
[in]	a_clampHi	High clamped corner.
[in]	a_clampK	K-value for clamping.
[in]	a_noiseAmp	Noise amplitude
[in]	a_noiseFreq	Noise frequency
[in]	a_persistence	Factor for noise octaves.
[in]	a_octaves	Number of octaves
[in]	a_reseed	If true, reseed the RNG. Otherwise, the the original Perlin hash table.

Note

The persistence argument indicates how we add octaves. With 0.5 we use half the amplitude and twice the frequency for the next octave.

BoundedNoisePlane() [2/2]

BoundedNoisePlane::BoundedNoisePlane

(

const BoundedNoisePlane &

a_inputIF

)

Copy constructor.

Parameters

[in]

a_inputIF

Other plane

Member Function Documentation

newImplicitFunction()

BaseIF * BoundedNoisePlane::newImplicitFunction ( ) const

virtual

Factory method.

Returns

Returns new plane with same parameters.

value()

Real BoundedNoisePlane::value ( const RealVect &  a_pos ) const

virtual

Value function.

Parameters

[in]

a_pos

Position

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The documentation for this class was generated from the following files:

• Source/ImplicitFunctions/CD_BoundedNoisePlane.H
• Source/ImplicitFunctions/CD_BoundedNoisePlane.cpp