VTK  9.3.20240328
vtkSPHCubicKernel.h
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1 // SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
2 // SPDX-License-Identifier: BSD-3-Clause
28 #ifndef vtkSPHCubicKernel_h
29 #define vtkSPHCubicKernel_h
30 
31 #include "vtkFiltersPointsModule.h" // For export macro
32 #include "vtkSPHKernel.h"
33 #include <algorithm> // For std::min()
34 
35 VTK_ABI_NAMESPACE_BEGIN
36 class vtkIdList;
37 class vtkDoubleArray;
38 
39 class VTKFILTERSPOINTS_EXPORT vtkSPHCubicKernel : public vtkSPHKernel
40 {
41 public:
43 
48  void PrintSelf(ostream& os, vtkIndent indent) override;
50 
56 
58 
61  double ComputeFunctionWeight(const double d) override
62  {
63  double tmp1 = 2.0 - (std::min)(d, 2.0);
64  double tmp2 = 1.0 - (std::min)(d, 1.0);
65  return (0.25 * tmp1 * tmp1 * tmp1 - tmp2 * tmp2 * tmp2);
66  }
68 
70 
74  double ComputeDerivWeight(const double d) override
75  {
76  double tmp1 = 2.0 - (std::min)(d, 2.0);
77  double tmp2 = 1.0 - (std::min)(d, 1.0);
78  return (-0.75 * tmp1 * tmp1 + 3.0 * tmp2 * tmp2);
79  }
81 
82 protected:
84  ~vtkSPHCubicKernel() override;
85 
86 private:
87  vtkSPHCubicKernel(const vtkSPHCubicKernel&) = delete;
88  void operator=(const vtkSPHCubicKernel&) = delete;
89 };
90 
91 VTK_ABI_NAMESPACE_END
92 #endif
abstract class to quickly locate points in 3-space
abstract class to specify dataset behavior
Definition: vtkDataSet.h:165
dynamic, self-adjusting array of double
list of point or cell ids
Definition: vtkIdList.h:132
a simple class to control print indentation
Definition: vtkIndent.h:108
represent and manipulate point attribute data
Definition: vtkPointData.h:139
a cubic SPH interpolation kernel
static vtkSPHCubicKernel * New()
Standard methods for instantiation, obtaining type information, and printing.
double ComputeFunctionWeight(const double d) override
Compute weighting factor given a normalized distance from a sample point.
~vtkSPHCubicKernel() override
void PrintSelf(ostream &os, vtkIndent indent) override
Standard methods for instantiation, obtaining type information, and printing.
void Initialize(vtkAbstractPointLocator *loc, vtkDataSet *ds, vtkPointData *pd) override
Produce the computational parameters for the kernel.
double ComputeDerivWeight(const double d) override
Compute weighting factor for derivative quantities given a normalized distance from a sample point.
a family of SPH interpolation kernels
Definition: vtkSPHKernel.h:56