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vtkSubdivideTetra.cxx
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vtkSubdivideTetra.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSubdivideTetra.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 "vtkSubdivideTetra.h"
#include "vtkCellType.h"
#include "vtkGenericCell.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMergePoints.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkUnstructuredGrid.h"
vtkStandardNewMacro(vtkSubdivideTetra);
//----------------------------------------------------------------------------
// Description:
// Construct with all types of clipping turned off.
vtkSubdivideTetra::vtkSubdivideTetra()
{
}
//----------------------------------------------------------------------------
int vtkSubdivideTetra::RequestData(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// get the input and output
vtkUnstructuredGrid *input = vtkUnstructuredGrid::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkUnstructuredGrid *output = vtkUnstructuredGrid::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkIdType numPts = input->GetNumberOfPoints();
vtkIdType numCells = input->GetNumberOfCells();
vtkPoints *inPts = input->GetPoints();
vtkIdType cellId, i;
vtkIdType pts[4];
vtkGenericCell *cell;
vtkPointData *pd = input->GetPointData();
vtkPointData *outputPD = output->GetPointData();
vtkPoints *newPts;
vtkIdType ptId;
double weights[4], x0[3], x1[3], x2[3], x3[3], x[3];
int p0, p1, p2, p3;
vtkIdType center, e01, e02, e03, e12, e13, e23;
vtkMergePoints *locator;
vtkDebugMacro(<<"Executing mesh subdivide");
if (input->IsHomogeneous() == 0 ||
input->GetCellType(0) != VTK_TETRA)
{
vtkErrorMacro(<<"all cells must be tetrahedra.");
return 1;
}
// Copy original points and point data
newPts = vtkPoints::New();
newPts->Allocate(5*numPts,numPts);
outputPD->InterpolateAllocate(pd,5*numPts,numPts);
output->Allocate(numCells);
output->SetPoints(newPts);
locator = vtkMergePoints::New();
locator->InitPointInsertion (newPts, input->GetBounds());
for (ptId=0; ptId < numPts; ptId++)
{
locator->InsertNextPoint(inPts->GetPoint(ptId));
outputPD->CopyData(pd,ptId,ptId);
}
cell = vtkGenericCell::New();
// loop over tetrahedra, generating sixteen new ones for each. This is
// done by introducing mid-edge nodes and a single mid-tetra node.
for(cellId=0; cellId < numCells; cellId++)
{
input->GetCell(cellId, cell);
// get tetra points
cell->Points->GetPoint(0,x0);
cell->Points->GetPoint(1,x1);
cell->Points->GetPoint(2,x2);
cell->Points->GetPoint(3,x3);
p0 = cell->PointIds->GetId(0);
p1 = cell->PointIds->GetId(1);
p2 = cell->PointIds->GetId(2);
p3 = cell->PointIds->GetId(3);
// compute center point
weights[0] = weights[1] = weights[2] = weights[3] = 0.25;
for (i=0; i<3; i++)
{
x[i] = 0.25*(x0[i] + x1[i] + x2[i] + x3[i]);
}
center = locator->InsertNextPoint(x);
outputPD->InterpolatePoint(pd, center, cell->PointIds, weights);
// compute edge points
// edge 0-1
for (i=0; i<3; i++)
{
x[i] = 0.5 * (x1[i] + x0[i]);
}
e01 = locator->InsertNextPoint(x);
outputPD->InterpolateEdge(pd, e01, p0, p1, 0.5);
// edge 1-2
for (i=0; i<3; i++)
{
x[i] = 0.5 * (x2[i] + x1[i]);
}
e12 = locator->InsertNextPoint(x);
outputPD->InterpolateEdge(pd, e12, p1, p2, 0.5);
// edge 2-0
for (i=0; i<3; i++)
{
x[i] = 0.5 * (x2[i] + x0[i]);
}
e02 = locator->InsertNextPoint(x);
outputPD->InterpolateEdge(pd, e02, p2, p0, 0.5);
// edge 0-3
for (i=0; i<3; i++)
{
x[i] = 0.5 * (x3[i] + x0[i]);
}
e03 = locator->InsertNextPoint(x);
outputPD->InterpolateEdge(pd, e03, p0, p3, 0.5);
// edge 1-3
for (i=0; i<3; i++)
{
x[i] = 0.5 * (x3[i] + x1[i]);
}
e13 = locator->InsertNextPoint(x);
outputPD->InterpolateEdge(pd, e13, p1, p3, 0.5);
// edge 2-3
for (i=0; i<3; i++)
{
x[i] = 0.5 * (x3[i] + x2[i]);
}
e23 = locator->InsertNextPoint(x);
outputPD->InterpolateEdge(pd, e23, p2, p3, 0.5);
// Now create tetrahedra
// First, four tetra from each vertex
pts[0] = p0;
pts[1] = e01;
pts[2] = e02;
pts[3] = e03;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[0] = p1;
pts[1] = e01;
pts[2] = e12;
pts[3] = e13;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[0] = p2;
pts[1] = e02;
pts[2] = e12;
pts[3] = e23;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[0] = p3;
pts[1] = e03;
pts[2] = e13;
pts[3] = e23;
output->InsertNextCell(VTK_TETRA, 4, pts);
// Now four tetra from cut-off tetra corners
pts[0] = center;
pts[1] = e01;
pts[2] = e02;
pts[3] = e03;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[1] = e01;
pts[2] = e12;
pts[3] = e13;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[1] = e02;
pts[2] = e12;
pts[3] = e23;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[1] = e03;
pts[2] = e13;
pts[3] = e23;
output->InsertNextCell(VTK_TETRA, 4, pts);
// Now four tetra from triangles on tetra faces
pts[0] = center;
pts[1] = e01;
pts[2] = e12;
pts[3] = e02;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[1] = e01;
pts[2] = e13;
pts[3] = e03;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[1] = e12;
pts[2] = e23;
pts[3] = e13;
output->InsertNextCell(VTK_TETRA, 4, pts);
pts[1] = e02;
pts[2] = e23;
pts[3] = e03;
output->InsertNextCell(VTK_TETRA, 4, pts);
} //for all cells
cell->Delete();
vtkDebugMacro(<<"Subdivided " << numCells << " cells");
locator->Delete();
newPts->Delete();
output->Squeeze();
return 1;
}
//----------------------------------------------------------------------------
void vtkSubdivideTetra::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}