vtkWendlandQuinticKernel.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkWendlandQuinticKernel.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.
 
=========================================================================*/
#ifndef vtkWendlandQuinticKernel_h
#define vtkWendlandQuinticKernel_h
 
#include "vtkFiltersPointsModule.h" // For export macro
#include "vtkSPHKernel.h"
#include <algorithm> // For std::min()
 
class vtkIdList;
class vtkDoubleArray;
 
class VTKFILTERSPOINTS_EXPORT vtkWendlandQuinticKernel : public vtkSPHKernel
{
public:
 
  static vtkWendlandQuinticKernel* New();
  vtkTypeMacro(vtkWendlandQuinticKernel, vtkSPHKernel);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  void Initialize(vtkAbstractPointLocator* loc, vtkDataSet* ds, vtkPointData* pd) override;
 
 
  double ComputeFunctionWeight(const double d) override
  {
    if (d >= 2.0)
    {
      return 0.0;
    }
    else
    {
      double tmp = 1.0 - 0.5 * d;
      return (tmp * tmp * tmp * tmp) * (1.0 + 2.0 * d);
    }
  }
 
 
  double ComputeDerivWeight(const double d) override
  {
    if (d >= 2.0)
    {
      return 0.0;
    }
    else
    {
      double tmp = 1.0 - 0.5 * d;
      return -2.0 * (tmp * tmp * tmp) * (1.0 + 2.0 * d) + 2.0 * (tmp * tmp * tmp * tmp);
    }
  }
 
protected:
  vtkWendlandQuinticKernel();
  ~vtkWendlandQuinticKernel() override;
 
private:
  vtkWendlandQuinticKernel(const vtkWendlandQuinticKernel&) = delete;
  void operator=(const vtkWendlandQuinticKernel&) = delete;
};
 
#endif