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