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114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkWendlandQuinticKernel.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 vtkWendlandQuinticKernel
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* @brief a quintic SPH interpolation kernel
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*
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*
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* vtkWendlandQuinticKernel is an smooth particle hydrodynamics interpolation kernel as
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* described by D.J. Price. This is a quintic 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 vtkWendlandQuinticKernel_h
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#define vtkWendlandQuinticKernel_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 vtkWendlandQuinticKernel : 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 vtkWendlandQuinticKernel* New();
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vtkTypeMacro(vtkWendlandQuinticKernel, 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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* Note that the formulation is slightly different to avoid an extra operation
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* (which has the effect of affecting the NormFactor by 1/16).
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*/
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double ComputeFunctionWeight(const double d) override
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{
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if (d >= 2.0)
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{
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return 0.0;
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}
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else
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{
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double tmp = 1.0 - 0.5 * d;
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return (tmp * tmp * tmp * tmp) * (1.0 + 2.0 * d);
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}
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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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if (d >= 2.0)
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{
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return 0.0;
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}
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else
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{
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double tmp = 1.0 - 0.5 * d;
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return -2.0 * (tmp * tmp * tmp) * (1.0 + 2.0 * d) + 2.0 * (tmp * tmp * tmp * tmp);
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}
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}
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//@}
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protected:
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vtkWendlandQuinticKernel();
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~vtkWendlandQuinticKernel() override;
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private:
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vtkWendlandQuinticKernel(const vtkWendlandQuinticKernel&) = delete;
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void operator=(const vtkWendlandQuinticKernel&) = delete;
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};
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#endif
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