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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkSPHCubicKernel.h
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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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/**
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* @class vtkSPHCubicKernel
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* @brief a cubic SPH interpolation kernel
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*
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*
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* vtkSPHCubicKernel is an smooth particle hydrodynamics interpolation kernel as
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* described by D.J. Price. This is a cubic formulation.
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*
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* @warning
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* For more information see D.J. Price, Smoothed particle hydrodynamics and
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* magnetohydrodynamics, J. Comput. Phys. 231:759-794, 2012. Especially
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* equation 49.
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*
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* @par Acknowledgments:
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* The following work has been generously supported by Altair Engineering
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* and FluiDyna GmbH. Please contact Steve Cosgrove or Milos Stanic for
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* more information.
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*
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* @sa
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* vtkSPHKernel vtkSPHInterpolator
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*/
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#ifndef vtkSPHCubicKernel_h
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#define vtkSPHCubicKernel_h
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#include "vtkFiltersPointsModule.h" // For export macro
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#include "vtkSPHKernel.h"
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#include <algorithm> // For std::min()
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class vtkIdList;
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class vtkDoubleArray;
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class VTKFILTERSPOINTS_EXPORT vtkSPHCubicKernel : public vtkSPHKernel
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{
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public:
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//@{
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/**
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* Standard methods for instantiation, obtaining type information, and printing.
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*/
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static vtkSPHCubicKernel* New();
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vtkTypeMacro(vtkSPHCubicKernel, vtkSPHKernel);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@}
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/**
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* Produce the computational parameters for the kernel. Invoke this method
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* after setting initial values like SpatialStep.
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*/
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void Initialize(vtkAbstractPointLocator* loc, vtkDataSet* ds, vtkPointData* pd) override;
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//@{
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/**
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* Compute weighting factor given a normalized distance from a sample point.
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*/
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double ComputeFunctionWeight(const double d) override
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{
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double tmp1 = 2.0 - std::min(d, 2.0);
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double tmp2 = 1.0 - std::min(d, 1.0);
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return (0.25 * tmp1 * tmp1 * tmp1 - tmp2 * tmp2 * tmp2);
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}
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//@}
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//@{
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/**
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* Compute weighting factor for derivative quantities given a normalized
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* distance from a sample point.
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*/
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double ComputeDerivWeight(const double d) override
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{
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double tmp1 = 2.0 - std::min(d, 2.0);
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double tmp2 = 1.0 - std::min(d, 1.0);
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return (-0.75 * tmp1 * tmp1 + 3.0 * tmp2 * tmp2);
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}
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//@}
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protected:
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vtkSPHCubicKernel();
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~vtkSPHCubicKernel() override;
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private:
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vtkSPHCubicKernel(const vtkSPHCubicKernel&) = delete;
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void operator=(const vtkSPHCubicKernel&) = delete;
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};
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#endif
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