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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImplicitVolume.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 "vtkImplicitVolume.h"
#include "vtkDoubleArray.h"
#include "vtkImageData.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkVoxel.h"
vtkStandardNewMacro(vtkImplicitVolume);
vtkCxxSetObjectMacro(vtkImplicitVolume,Volume,vtkImageData);
//----------------------------------------------------------------------------
// Construct an vtkImplicitVolume with no initial volume; the OutValue
// set to a large negative number; and the OutGradient set to (0,0,1).
vtkImplicitVolume::vtkImplicitVolume()
{
this->Volume = NULL;
this->OutValue = VTK_DOUBLE_MIN;
this->OutGradient[0] = 0.0;
this->OutGradient[1] = 0.0;
this->OutGradient[2] = 1.0;
this->PointIds = vtkIdList::New();
this->PointIds->Allocate(8);
}
//----------------------------------------------------------------------------
vtkImplicitVolume::~vtkImplicitVolume()
{
if (this->Volume)
{
this->Volume->Delete();
this->Volume = NULL;
}
this->PointIds->Delete();
}
//----------------------------------------------------------------------------
// Evaluate the ImplicitVolume. This returns the interpolated scalar value
// at x[3].
double vtkImplicitVolume::EvaluateFunction(double x[3])
{
vtkDataArray *scalars;
int ijk[3];
vtkIdType numPts, i;
double pcoords[3], weights[8], s;
// See if a volume is defined
if ( !this->Volume ||
!(scalars = this->Volume->GetPointData()->GetScalars()) )
{
vtkErrorMacro(<<"Can't evaluate volume!");
return this->OutValue;
}
// Find the cell that contains xyz and get it
if ( this->Volume->ComputeStructuredCoordinates(x,ijk,pcoords) )
{
this->Volume->GetCellPoints(this->Volume->ComputeCellId(ijk),this->PointIds);
vtkVoxel::InterpolationFunctions(pcoords,weights);
numPts = this->PointIds->GetNumberOfIds ();
for (s=0.0, i=0; i < numPts; i++)
{
s += scalars->GetComponent(this->PointIds->GetId(i),0) * weights[i];
}
return s;
}
else
{
return this->OutValue;
}
}
//----------------------------------------------------------------------------
unsigned long vtkImplicitVolume::GetMTime()
{
unsigned long mTime = this->vtkImplicitFunction::GetMTime();
unsigned long volumeMTime;
if ( this->Volume != NULL )
{
volumeMTime = this->Volume->GetMTime();
mTime = ( volumeMTime > mTime ? volumeMTime : mTime );
}
return mTime;
}
//----------------------------------------------------------------------------
// Evaluate ImplicitVolume gradient.
void vtkImplicitVolume::EvaluateGradient(double x[3], double n[3])
{
vtkDataArray *scalars;
int i, ijk[3];
double pcoords[3], weights[8], *v;
vtkDoubleArray *gradient;
gradient = vtkDoubleArray::New();
gradient->SetNumberOfComponents(3);
gradient->SetNumberOfTuples(8);
// See if a volume is defined
if ( !this->Volume ||
!(scalars = this->Volume->GetPointData()->GetScalars()) )
{
vtkErrorMacro(<<"Can't evaluate volume!");
return;
}
// Find the cell that contains xyz and get it
if ( this->Volume->ComputeStructuredCoordinates(x,ijk,pcoords) )
{
vtkVoxel::InterpolationFunctions(pcoords,weights);
this->Volume->GetVoxelGradient(ijk[0], ijk[1], ijk[2], scalars, gradient);
n[0] = n[1] = n[2] = 0.0;
for (i=0; i < 8; i++)
{
v = gradient->GetTuple(i);
n[0] += v[0] * weights[i];
n[1] += v[1] * weights[i];
n[2] += v[2] * weights[i];
}
}
else
{ // use outside value
for ( i=0; i < 3; i++ )
{
n[i] = this->OutGradient[i];
}
}
gradient->Delete();
}
//----------------------------------------------------------------------------
void vtkImplicitVolume::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Out Value: " << this->OutValue << "\n";
os << indent << "Out Gradient: (" << this->OutGradient[0] << ", "
<< this->OutGradient[1] << ", " << this->OutGradient[2] << ")\n";
if ( this->Volume )
{
os << indent << "Volume: " << this->Volume << "\n";
}
else
{
os << indent << "Volume: (none)\n";
}
}
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