1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*=========================================================================
Program: Visualization Toolkit
Module: vtkSPHKernel.cxx
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.
=========================================================================*/
#include "vtkSPHKernel.h"
#include "vtkAbstractPointLocator.h"
#include "vtkObjectFactory.h"
#include "vtkIdList.h"
#include "vtkDoubleArray.h"
#include "vtkFloatArray.h"
#include "vtkDataArray.h"
#include "vtkDataSet.h"
#include "vtkMath.h"
vtkCxxSetObjectMacro(vtkSPHKernel,CutoffArray,vtkDataArray);
vtkCxxSetObjectMacro(vtkSPHKernel,DensityArray,vtkDataArray);
vtkCxxSetObjectMacro(vtkSPHKernel,MassArray,vtkDataArray);
//----------------------------------------------------------------------------
vtkSPHKernel::vtkSPHKernel()
{
this->RequiresInitialization = true;
this->SpatialStep = 0.001;
this->Dimension = 3;
this->CutoffArray = NULL;
this->DensityArray = NULL;
this->MassArray = NULL;
}
//----------------------------------------------------------------------------
vtkSPHKernel::~vtkSPHKernel()
{
this->SetCutoffArray(NULL);
this->SetDensityArray(NULL);
this->SetMassArray(NULL);
}
//----------------------------------------------------------------------------
// At this point, the spatial step, the dimension of the kernel, the cutoff
// factor, and the sigma normalization factor should be known.
void vtkSPHKernel::
Initialize(vtkAbstractPointLocator *loc, vtkDataSet *ds, vtkPointData *attr)
{
this->Superclass::Initialize(loc, ds, attr);
// this->CutoffFactor should have been set by subclass
this->Cutoff = this->CutoffFactor * this->SpatialStep;
this->DistNorm = 1.0 / this->SpatialStep;
this->NormFactor = this->Sigma * pow(this->DistNorm,this->Dimension);
this->DefaultVolume = pow(this->SpatialStep,this->Dimension);
// See if cutoff array is provided.
if ( this->CutoffArray && this->CutoffArray->GetNumberOfComponents() == 1 )
{
this->UseCutoffArray = true;
}
else
{
this->UseCutoffArray = false;
}
// See if local mass and density information is provided
if ( this->DensityArray && this->MassArray &&
this->DensityArray->GetNumberOfComponents() == 1 &&
this->MassArray->GetNumberOfComponents() == 1 )
{
this->UseArraysForVolume = true;
}
else
{
this->UseArraysForVolume = false;
}
}
//----------------------------------------------------------------------------
// Radius around point is cutoff factor * smoothing length. That is unless
// cutoff array is provided.
vtkIdType vtkSPHKernel::
ComputeBasis(double x[3], vtkIdList *pIds, vtkIdType ptId)
{
double cutoff;
if ( this->UseCutoffArray )
{
this->CutoffArray->GetTuple(ptId,&cutoff);
}
else
{
cutoff = this->Cutoff;
}
this->Locator->FindPointsWithinRadius(cutoff, x, pIds);
return pIds->GetNumberOfIds();
}
//----------------------------------------------------------------------------
vtkIdType vtkSPHKernel::
ComputeWeights(double x[3], vtkIdList *pIds, vtkDoubleArray *weights)
{
vtkIdType numPts = pIds->GetNumberOfIds();
int i;
vtkIdType id;
double d, y[3];
weights->SetNumberOfTuples(numPts);
double *w = weights->GetPointer(0);
double KW, mass, density, volume;
// Compute SPH coefficients.
for (i=0; i<numPts; ++i)
{
id = pIds->GetId(i);
this->DataSet->GetPoint(id,y);
d = sqrt( vtkMath::Distance2BetweenPoints(x,y) );
KW = this->ComputeFunctionWeight(d*this->DistNorm);
if ( this->UseArraysForVolume )
{
this->MassArray->GetTuple(id,&mass);
this->DensityArray->GetTuple(id,&density);
volume = mass /density;
}
else
{
volume = this->DefaultVolume;
}
w[i] = this->NormFactor * KW * volume;
}//over all neighbor points
return numPts;
}
//----------------------------------------------------------------------------
vtkIdType vtkSPHKernel::
ComputeDerivWeights(double x[3], vtkIdList *pIds, vtkDoubleArray *weights,
vtkDoubleArray *gradWeights)
{
vtkIdType numPts = pIds->GetNumberOfIds();
int i;
vtkIdType id;
double d, y[3];
weights->SetNumberOfTuples(numPts);
double *w = weights->GetPointer(0);
gradWeights->SetNumberOfTuples(numPts);
double *gw = gradWeights->GetPointer(0);
double KW, GW, volume=this->DefaultVolume;
// Compute SPH coefficients for data and deriative data
for (i=0; i<numPts; ++i)
{
id = pIds->GetId(i);
this->DataSet->GetPoint(id,y);
d = sqrt( vtkMath::Distance2BetweenPoints(x,y) );
KW = this->ComputeFunctionWeight(d*this->DistNorm);
GW = this->ComputeDerivWeight(d*this->DistNorm);
w[i] = this->NormFactor * KW * volume;
gw[i] = this->NormFactor * GW * volume;
}//over all neighbor points
return numPts;
}
//----------------------------------------------------------------------------
void vtkSPHKernel::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Spatial Step: " << this->SpatialStep << "\n";
os << indent << "Dimension: " << this->Dimension << "\n";
os << indent << "Cutoff Factor: " << this->CutoffFactor << "\n";
os << indent << "Sigma: " << this->Sigma << "\n";
os << indent << "Cutoff Array: " << this->CutoffArray<< "\n";
os << indent << "Density Array: " << this->DensityArray << "\n";
os << indent << "Mass Array: " << this->MassArray << "\n";
}
|
