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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPerlinNoise.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkPerlinNoise - an implicit function that implements Perlin noise
// .SECTION Description
// vtkPerlinNoise computes a Perlin noise field as an implicit function.
// vtkPerlinNoise is a concrete implementation of vtkImplicitFunction.
// Perlin noise, originally described by Ken Perlin, is a non-periodic and
// continuous noise function useful for modeling real-world objects.
//
// The amplitude and frequency of the noise pattern are adjustable. This
// implementation of Perlin noise is derived closely from Greg Ward's version
// in Graphics Gems II.
// .SECTION See Also
// vtkImplicitFunction
#ifndef __vtkPerlinNoise_h
#define __vtkPerlinNoise_h
#include "vtkImplicitFunction.h"
class VTK_FILTERING_EXPORT vtkPerlinNoise : public vtkImplicitFunction
{
public:
vtkTypeMacro(vtkPerlinNoise,vtkImplicitFunction);
void PrintSelf(ostream& os, vtkIndent indent);
// Description
// Instantiate the class.
static vtkPerlinNoise *New();
// Description:
// Evaluate PerlinNoise function.
double EvaluateFunction(double x[3]);
double EvaluateFunction(double x, double y, double z)
{return this->vtkImplicitFunction::EvaluateFunction(x, y, z); } ;
// Description:
// Evaluate PerlinNoise gradient. Currently, the method returns a 0
// gradient.
void EvaluateGradient(double x[3], double n[3]);
// Description:
// Set/get the frequency, or physical scale, of the noise function
// (higher is finer scale). The frequency can be adjusted per axis, or
// the same for all axes.
vtkSetVector3Macro(Frequency,double);
vtkGetVectorMacro(Frequency,double,3);
// Description:
// Set/get the phase of the noise function. This parameter can be used to
// shift the noise function within space (perhaps to avoid a beat with a
// noise pattern at another scale). Phase tends to repeat about every
// unit, so a phase of 0.5 is a half-cycle shift.
vtkSetVector3Macro(Phase,double);
vtkGetVectorMacro(Phase,double,3);
// Description:
// Set/get the amplitude of the noise function. Amplitude can be negative.
// The noise function varies randomly between -|Amplitude| and |Amplitude|.
// Therefore the range of values is 2*|Amplitude| large.
// The initial amplitude is 1.
vtkSetMacro(Amplitude,double);
vtkGetMacro(Amplitude,double);
protected:
vtkPerlinNoise();
~vtkPerlinNoise() {}
double Frequency[3];
double Phase[3];
double Amplitude;
private:
vtkPerlinNoise(const vtkPerlinNoise&); // Not implemented
void operator=(const vtkPerlinNoise&); // Not implemented
};
#endif
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