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