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vtkCutter.cxx
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vtkCutter.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCutter.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 "vtkCutter.h"
#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkCellIterator.h"
#include "vtkContourValues.h"
#include "vtkDataSet.h"
#include "vtkDoubleArray.h"
#include "vtkFloatArray.h"
#include "vtkGenericCell.h"
#include "vtkGridSynchronizedTemplates3D.h"
#include "vtkImageData.h"
#include "vtkImplicitFunction.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMergePoints.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkPlane.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkRectilinearGrid.h"
#include "vtkRectilinearSynchronizedTemplates.h"
#include "vtkSmartPointer.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkStructuredGrid.h"
#include "vtkSynchronizedTemplates3D.h"
#include "vtkSynchronizedTemplatesCutter3D.h"
#include "vtkUnstructuredGridBase.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkIncrementalPointLocator.h"
#include "vtkTimerLog.h"
#include "vtkSmartPointer.h"
#include "vtkContourHelper.h"
#include <algorithm>
#include <math.h>
vtkStandardNewMacro(vtkCutter);
vtkCxxSetObjectMacro(vtkCutter,CutFunction,vtkImplicitFunction);
vtkCxxSetObjectMacro(vtkCutter,Locator,vtkIncrementalPointLocator)
//----------------------------------------------------------------------------
// Construct with user-specified implicit function; initial value of 0.0; and
// generating cut scalars turned off.
vtkCutter::vtkCutter(vtkImplicitFunction *cf)
{
this->ContourValues = vtkContourValues::New();
this->SortBy = VTK_SORT_BY_VALUE;
this->CutFunction = cf;
this->GenerateCutScalars = 0;
this->Locator = NULL;
this->GenerateTriangles = 1;
this->OutputPointsPrecision = DEFAULT_PRECISION;
this->SynchronizedTemplates3D = vtkSynchronizedTemplates3D::New();
this->SynchronizedTemplatesCutter3D = vtkSynchronizedTemplatesCutter3D::New();
this->GridSynchronizedTemplates = vtkGridSynchronizedTemplates3D::New();
this->RectilinearSynchronizedTemplates = vtkRectilinearSynchronizedTemplates::New();
this->GetInformation()->Set(vtkAlgorithm::PRESERVES_RANGES(), 1);
this->GetInformation()->Set(vtkAlgorithm::PRESERVES_BOUNDS(), 1);
}
//----------------------------------------------------------------------------
vtkCutter::~vtkCutter()
{
this->ContourValues->Delete();
this->SetCutFunction(NULL);
this->SetLocator(NULL);
this->SynchronizedTemplates3D->Delete();
this->SynchronizedTemplatesCutter3D->Delete();
this->GridSynchronizedTemplates->Delete();
this->RectilinearSynchronizedTemplates->Delete();
}
//----------------------------------------------------------------------------
// Overload standard modified time function. If cut functions is modified,
// or contour values modified, then this object is modified as well.
unsigned long vtkCutter::GetMTime()
{
unsigned long mTime=this->Superclass::GetMTime();
unsigned long contourValuesMTime=this->ContourValues->GetMTime();
unsigned long time;
mTime = ( contourValuesMTime > mTime ? contourValuesMTime : mTime );
if ( this->CutFunction != NULL )
{
time = this->CutFunction->GetMTime();
mTime = ( time > mTime ? time : mTime );
}
return mTime;
}
//----------------------------------------------------------------------------
void vtkCutter::StructuredPointsCutter(vtkDataSet *dataSetInput,
vtkPolyData *thisOutput,
vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
vtkImageData *input = vtkImageData::SafeDownCast(dataSetInput);
vtkPolyData *output;
vtkIdType numPts = input->GetNumberOfPoints();
if (numPts < 1)
{
return;
}
int numContours = this->GetNumberOfContours();
// for one contour we use the SyncTempCutter which is faster and has a
// smaller memory footprint
if (numContours == 1)
{
this->SynchronizedTemplatesCutter3D->SetCutFunction(this->CutFunction);
this->SynchronizedTemplatesCutter3D->SetValue(0, this->GetValue(0));
this->SynchronizedTemplatesCutter3D->SetGenerateTriangles(this->GetGenerateTriangles());
this->SynchronizedTemplatesCutter3D->ProcessRequest(request,inputVector,outputVector);
return;
}
// otherwise compute scalar data then contour
vtkFloatArray *cutScalars = vtkFloatArray::New();
cutScalars->SetNumberOfTuples(numPts);
cutScalars->SetName("cutScalars");
vtkImageData *contourData = vtkImageData::New();
contourData->ShallowCopy(input);
if (this->GenerateCutScalars)
{
contourData->GetPointData()->SetScalars(cutScalars);
}
else
{
contourData->GetPointData()->AddArray(cutScalars);
}
int i,j,k;
double scalar;
double x[3];
int *ext = input->GetExtent();
double *origin = input->GetOrigin();
double *spacing = input->GetSpacing();
int count = 0;
for (k = ext[4]; k <= ext[5]; ++k)
{
x[2] = origin[2] + spacing[2]*k;
for (j = ext[2]; j <= ext[3]; ++j)
{
x[1] = origin[1] + spacing[1]*j;
for (i = ext[0]; i <= ext[1]; i++)
{
x[0] = origin[0] + spacing[0]*i;
scalar = this->CutFunction->FunctionValue(x);
cutScalars->SetComponent(count, 0, scalar);
count++;
}
}
}
this->SynchronizedTemplates3D->SetInputData(contourData);
this->SynchronizedTemplates3D->
SetInputArrayToProcess(0,0,0,vtkDataObject::FIELD_ASSOCIATION_POINTS,"cutScalars");
this->SynchronizedTemplates3D->SetNumberOfContours(numContours);
for (i = 0; i < numContours; i++)
{
this->SynchronizedTemplates3D->SetValue(i, this->GetValue(i));
}
this->SynchronizedTemplates3D->ComputeScalarsOff();
this->SynchronizedTemplates3D->ComputeNormalsOff();
output = this->SynchronizedTemplates3D->GetOutput();
this->SynchronizedTemplatesCutter3D->SetGenerateTriangles(this->GetGenerateTriangles());
this->SynchronizedTemplates3D->Update();
output->Register(this);
thisOutput->CopyStructure(output);
thisOutput->GetPointData()->ShallowCopy(output->GetPointData());
thisOutput->GetCellData()->ShallowCopy(output->GetCellData());
output->UnRegister(this);
cutScalars->Delete();
contourData->Delete();
}
//----------------------------------------------------------------------------
void vtkCutter::StructuredGridCutter(vtkDataSet *dataSetInput,
vtkPolyData *thisOutput)
{
vtkStructuredGrid *input = vtkStructuredGrid::SafeDownCast(dataSetInput);
vtkPolyData *output;
vtkIdType numPts = input->GetNumberOfPoints();
if (numPts < 1)
{
return;
}
vtkFloatArray *cutScalars = vtkFloatArray::New();
cutScalars->SetNumberOfTuples(numPts);
cutScalars->SetName("cutScalars");
vtkStructuredGrid *contourData = vtkStructuredGrid::New();
contourData->ShallowCopy(input);
if (this->GenerateCutScalars)
{
contourData->GetPointData()->SetScalars(cutScalars);
}
else
{
contourData->GetPointData()->AddArray(cutScalars);
}
int i;
double scalar;
for (i = 0; i < numPts; i++)
{
scalar = this->CutFunction->FunctionValue(input->GetPoint(i));
cutScalars->SetComponent(i, 0, scalar);
}
int numContours = this->GetNumberOfContours();
this->GridSynchronizedTemplates->SetDebug(this->GetDebug());
this->GridSynchronizedTemplates->
SetOutputPointsPrecision(this->OutputPointsPrecision);
this->GridSynchronizedTemplates->SetInputData(contourData);
this->GridSynchronizedTemplates->
SetInputArrayToProcess(0,0,0,vtkDataObject::FIELD_ASSOCIATION_POINTS,"cutScalars");
this->GridSynchronizedTemplates->SetNumberOfContours(numContours);
for (i = 0; i < numContours; i++)
{
this->GridSynchronizedTemplates->SetValue(i, this->GetValue(i));
}
this->GridSynchronizedTemplates->ComputeScalarsOff();
this->GridSynchronizedTemplates->ComputeNormalsOff();
this->GridSynchronizedTemplates->SetGenerateTriangles(this->GetGenerateTriangles());
output = this->GridSynchronizedTemplates->GetOutput();
this->GridSynchronizedTemplates->Update();
output->Register(this);
thisOutput->ShallowCopy(output);
output->UnRegister(this);
cutScalars->Delete();
contourData->Delete();
}
//----------------------------------------------------------------------------
void vtkCutter::RectilinearGridCutter(vtkDataSet *dataSetInput,
vtkPolyData *thisOutput)
{
vtkRectilinearGrid *input = vtkRectilinearGrid::SafeDownCast(dataSetInput);
vtkPolyData *output;
vtkIdType numPts = input->GetNumberOfPoints();
if (numPts < 1)
{
return;
}
vtkFloatArray *cutScalars = vtkFloatArray::New();
cutScalars->SetNumberOfTuples(numPts);
cutScalars->SetName("cutScalars");
vtkRectilinearGrid *contourData = vtkRectilinearGrid::New();
contourData->ShallowCopy(input);
if (this->GenerateCutScalars)
{
contourData->GetPointData()->SetScalars(cutScalars);
}
else
{
contourData->GetPointData()->AddArray(cutScalars);
}
int i;
double scalar;
for (i = 0; i < numPts; i++)
{
scalar = this->CutFunction->FunctionValue(input->GetPoint(i));
cutScalars->SetComponent(i, 0, scalar);
}
int numContours = this->GetNumberOfContours();
this->RectilinearSynchronizedTemplates->SetInputData(contourData);
this->RectilinearSynchronizedTemplates->
SetInputArrayToProcess(0,0,0,vtkDataObject::FIELD_ASSOCIATION_POINTS,"cutScalars");
this->RectilinearSynchronizedTemplates->SetNumberOfContours(numContours);
for (i = 0; i < numContours; i++)
{
this->RectilinearSynchronizedTemplates->SetValue(i, this->GetValue(i));
}
this->RectilinearSynchronizedTemplates->ComputeScalarsOff();
this->RectilinearSynchronizedTemplates->ComputeNormalsOff();
this->RectilinearSynchronizedTemplates->SetGenerateTriangles(this->GenerateTriangles);
output = this->RectilinearSynchronizedTemplates->GetOutput();
this->RectilinearSynchronizedTemplates->Update();
output->Register(this);
thisOutput->ShallowCopy(output);
output->UnRegister(this);
cutScalars->Delete();
contourData->Delete();
}
//----------------------------------------------------------------------------
// Cut through data generating surface.
//
int vtkCutter::RequestData(
vtkInformation *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
vtkDataSet *input = vtkDataSet::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkPolyData *output = vtkPolyData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkDebugMacro(<< "Executing cutter");
if (!this->CutFunction)
{
vtkErrorMacro("No cut function specified");
return 0;
}
if (!input)
{
// this could be a table in a multiblock structure, i.e. no cut!
return 0;
}
if ( input->GetNumberOfPoints() < 1 || this->GetNumberOfContours() < 1 )
{
return 1;
}
#ifdef TIMEME
vtkSmartPointer<vtkTimerLog> timer = vtkSmartPointer<vtkTimerLog>::New();
timer->StartTimer();
#endif
if ((input->GetDataObjectType() == VTK_STRUCTURED_POINTS ||
input->GetDataObjectType() == VTK_IMAGE_DATA) &&
input->GetCell(0) && input->GetCell(0)->GetCellDimension() >= 3 )
{
this->StructuredPointsCutter(input, output, request, inputVector, outputVector);
}
else if (input->GetDataObjectType() == VTK_STRUCTURED_GRID &&
input->GetCell(0) &&
input->GetCell(0)->GetCellDimension() >= 3)
{
this->StructuredGridCutter(input, output);
}
else if (input->GetDataObjectType() == VTK_RECTILINEAR_GRID &&
static_cast<vtkRectilinearGrid *>(input)->GetDataDimension() == 3 )
{
this->RectilinearGridCutter(input, output);
}
else if (input->GetDataObjectType() == VTK_UNSTRUCTURED_GRID)
{
vtkDebugMacro(<< "Executing Unstructured Grid Cutter");
this->UnstructuredGridCutter(input, output);
}
else
{
vtkDebugMacro(<< "Executing DataSet Cutter");
this->DataSetCutter(input, output);
}
#ifdef TIMEME
timer->StopTimer();
cout << "Sliced "<<output->GetNumberOfCells()<<" cells in "<< timer->GetElapsedTime() <<" secs "<<endl;
#endif
return 1;
}
//----------------------------------------------------------------------------
void vtkCutter::GetCellTypeDimensions(unsigned char* cellTypeDimensions)
{
// Assume most cells will be 3d.
memset(cellTypeDimensions, 3, VTK_NUMBER_OF_CELL_TYPES);
cellTypeDimensions[VTK_EMPTY_CELL] = 0;
cellTypeDimensions[VTK_VERTEX] = 0;
cellTypeDimensions[VTK_POLY_VERTEX] = 0;
cellTypeDimensions[VTK_LINE] = 1;
cellTypeDimensions[VTK_CUBIC_LINE]=1;
cellTypeDimensions[VTK_POLY_LINE] = 1;
cellTypeDimensions[VTK_QUADRATIC_EDGE] = 1;
cellTypeDimensions[VTK_PARAMETRIC_CURVE] = 1;
cellTypeDimensions[VTK_HIGHER_ORDER_EDGE] = 1;
cellTypeDimensions[VTK_TRIANGLE] = 2;
cellTypeDimensions[VTK_TRIANGLE_STRIP] = 2;
cellTypeDimensions[VTK_POLYGON] = 2;
cellTypeDimensions[VTK_PIXEL] = 2;
cellTypeDimensions[VTK_QUAD] = 2;
cellTypeDimensions[VTK_QUADRATIC_TRIANGLE] = 2;
cellTypeDimensions[VTK_BIQUADRATIC_TRIANGLE] = 2;
cellTypeDimensions[VTK_QUADRATIC_QUAD] = 2;
cellTypeDimensions[VTK_QUADRATIC_LINEAR_QUAD] = 2;
cellTypeDimensions[VTK_BIQUADRATIC_QUAD] = 2;
cellTypeDimensions[VTK_PARAMETRIC_SURFACE] = 2;
cellTypeDimensions[VTK_PARAMETRIC_TRI_SURFACE] = 2;
cellTypeDimensions[VTK_PARAMETRIC_QUAD_SURFACE] = 2;
cellTypeDimensions[VTK_HIGHER_ORDER_TRIANGLE] = 2;
cellTypeDimensions[VTK_HIGHER_ORDER_QUAD] = 2;
cellTypeDimensions[VTK_HIGHER_ORDER_POLYGON] = 2;
}
//----------------------------------------------------------------------------
void vtkCutter::DataSetCutter(vtkDataSet *input, vtkPolyData *output)
{
vtkIdType cellId, i;
int iter;
vtkPoints *cellPts;
vtkDoubleArray *cellScalars;
vtkGenericCell *cell;
vtkCellArray *newVerts, *newLines, *newPolys;
vtkPoints *newPoints;
vtkDoubleArray *cutScalars;
double value, s;
vtkIdType estimatedSize, numCells=input->GetNumberOfCells();
vtkIdType numPts=input->GetNumberOfPoints();
int numCellPts;
vtkPointData *inPD, *outPD;
vtkCellData *inCD=input->GetCellData(), *outCD=output->GetCellData();
vtkIdList *cellIds;
int numContours=this->ContourValues->GetNumberOfContours();
int abortExecute=0;
cellScalars=vtkDoubleArray::New();
// Create objects to hold output of contour operation
//
estimatedSize = static_cast<vtkIdType>(
pow(static_cast<double>(numCells), .75)) * numContours;
estimatedSize = estimatedSize / 1024 * 1024; //multiple of 1024
if (estimatedSize < 1024)
{
estimatedSize = 1024;
}
newPoints = vtkPoints::New();
// set precision for the points in the output
if(this->OutputPointsPrecision == vtkAlgorithm::DEFAULT_PRECISION)
{
vtkPointSet *inputPointSet = vtkPointSet::SafeDownCast(input);
if(inputPointSet)
{
newPoints->SetDataType(inputPointSet->GetPoints()->GetDataType());
}
else
{
newPoints->SetDataType(VTK_FLOAT);
}
}
else if(this->OutputPointsPrecision == vtkAlgorithm::SINGLE_PRECISION)
{
newPoints->SetDataType(VTK_FLOAT);
}
else if(this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
{
newPoints->SetDataType(VTK_DOUBLE);
}
newPoints->Allocate(estimatedSize,estimatedSize/2);
newVerts = vtkCellArray::New();
newVerts->Allocate(estimatedSize,estimatedSize/2);
newLines = vtkCellArray::New();
newLines->Allocate(estimatedSize,estimatedSize/2);
newPolys = vtkCellArray::New();
newPolys->Allocate(estimatedSize,estimatedSize/2);
cutScalars = vtkDoubleArray::New();
cutScalars->SetNumberOfTuples(numPts);
// Interpolate data along edge. If generating cut scalars, do necessary setup
if ( this->GenerateCutScalars )
{
inPD = vtkPointData::New();
inPD->ShallowCopy(input->GetPointData());//copies original attributes
inPD->SetScalars(cutScalars);
}
else
{
inPD = input->GetPointData();
}
outPD = output->GetPointData();
outPD->InterpolateAllocate(inPD,estimatedSize,estimatedSize/2);
outCD->CopyAllocate(inCD,estimatedSize,estimatedSize/2);
// locator used to merge potentially duplicate points
if ( this->Locator == NULL )
{
this->CreateDefaultLocator();
}
this->Locator->InitPointInsertion (newPoints, input->GetBounds());
// Loop over all points evaluating scalar function at each point
//
for ( i=0; i < numPts; i++ )
{
s = this->CutFunction->FunctionValue(input->GetPoint(i));
cutScalars->SetComponent(i,0,s);
}
// Compute some information for progress methods
//
cell = vtkGenericCell::New();
vtkIdType numCuts = numContours*numCells;
vtkIdType progressInterval = numCuts/20 + 1;
int cut=0;
vtkContourHelper helper(this->Locator, newVerts, newLines, newPolys,inPD, inCD, outPD,outCD, estimatedSize,this->GenerateTriangles!=0);
if ( this->SortBy == VTK_SORT_BY_CELL )
{
// Loop over all contour values. Then for each contour value,
// loop over all cells.
//
// This is going to have a problem if the input has 2D and 3D cells.
// I am fixing a bug where cell data is scrambled becauses with
// vtkPolyData output, verts and lines have lower cell ids than triangles.
for (iter=0; iter < numContours && !abortExecute; iter++)
{
// Loop over all cells; get scalar values for all cell points
// and process each cell.
//
for (cellId=0; cellId < numCells && !abortExecute; cellId++)
{
if ( !(++cut % progressInterval) )
{
vtkDebugMacro(<<"Cutting #" << cut);
this->UpdateProgress (static_cast<double>(cut)/numCuts);
abortExecute = this->GetAbortExecute();
}
input->GetCell(cellId,cell);
cellPts = cell->GetPoints();
cellIds = cell->GetPointIds();
numCellPts = cellPts->GetNumberOfPoints();
cellScalars->SetNumberOfTuples(numCellPts);
for (i=0; i < numCellPts; i++)
{
s = cutScalars->GetComponent(cellIds->GetId(i),0);
cellScalars->SetTuple(i,&s);
}
value = this->ContourValues->GetValue(iter);
helper.Contour(cell,value, cellScalars, cellId);
} // for all cells
} // for all contour values
} // sort by cell
else // VTK_SORT_BY_VALUE:
{
// Three passes over the cells to process lower dimensional cells first.
// For poly data output cells need to be added in the order:
// verts, lines and then polys, or cell data gets mixed up.
// A better solution is to have an unstructured grid output.
// I create a table that maps cell type to cell dimensionality,
// because I need a fast way to get cell dimensionality.
// This assumes GetCell is slow and GetCellType is fast.
// I do not like hard coding a list of cell types here,
// but I do not want to add GetCellDimension(vtkIdType cellId)
// to the vtkDataSet API. Since I anticipate that the output
// will change to vtkUnstructuredGrid. This temporary solution
// is acceptable.
//
int cellType;
unsigned char cellTypeDimensions[VTK_NUMBER_OF_CELL_TYPES];
vtkCutter::GetCellTypeDimensions(cellTypeDimensions);
int dimensionality;
// We skip 0d cells (points), because they cannot be cut (generate no data).
for (dimensionality = 1; dimensionality <= 3; ++dimensionality)
{
// Loop over all cells; get scalar values for all cell points
// and process each cell.
//
for (cellId=0; cellId < numCells && !abortExecute; cellId++)
{
// I assume that "GetCellType" is fast.
cellType = input->GetCellType(cellId);
if (cellType >= VTK_NUMBER_OF_CELL_TYPES)
{ // Protect against new cell types added.
vtkErrorMacro("Unknown cell type " << cellType);
continue;
}
if (cellTypeDimensions[cellType] != dimensionality)
{
continue;
}
input->GetCell(cellId,cell);
cellPts = cell->GetPoints();
cellIds = cell->GetPointIds();
numCellPts = cellPts->GetNumberOfPoints();
cellScalars->SetNumberOfTuples(numCellPts);
for (i=0; i < numCellPts; i++)
{
s = cutScalars->GetComponent(cellIds->GetId(i),0);
cellScalars->SetTuple(i,&s);
}
// Loop over all contour values.
for (iter=0; iter < numContours && !abortExecute; iter++)
{
if (dimensionality == 3 && !(++cut % progressInterval) )
{
vtkDebugMacro(<<"Cutting #" << cut);
this->UpdateProgress (static_cast<double>(cut)/numCuts);
abortExecute = this->GetAbortExecute();
}
value = this->ContourValues->GetValue(iter);
helper.Contour(cell,value, cellScalars, cellId);
} // for all contour values
} // for all cells
} // for all dimensions.
} // sort by value
// Update ourselves. Because we don't know upfront how many verts, lines,
// polys we've created, take care to reclaim memory.
//
cell->Delete();
cellScalars->Delete();
cutScalars->Delete();
if ( this->GenerateCutScalars )
{
inPD->Delete();
}
output->SetPoints(newPoints);
newPoints->Delete();
if (newVerts->GetNumberOfCells())
{
output->SetVerts(newVerts);
}
newVerts->Delete();
if (newLines->GetNumberOfCells())
{
output->SetLines(newLines);
}
newLines->Delete();
if (newPolys->GetNumberOfCells())
{
output->SetPolys(newPolys);
}
newPolys->Delete();
this->Locator->Initialize();//release any extra memory
output->Squeeze();
}
//----------------------------------------------------------------------------
void vtkCutter::UnstructuredGridCutter(vtkDataSet *input, vtkPolyData *output)
{
vtkIdType i;
int iter;
vtkDoubleArray *cellScalars;
vtkCellArray *newVerts, *newLines, *newPolys;
vtkPoints *newPoints;
vtkDoubleArray *cutScalars;
double value, s;
vtkIdType estimatedSize, numCells=input->GetNumberOfCells();
vtkIdType numPts=input->GetNumberOfPoints();
int numCellPts;
vtkIdType *ptIds;
vtkPointData *inPD, *outPD;
vtkCellData *inCD=input->GetCellData(), *outCD=output->GetCellData();
vtkIdList *cellIds;
int numContours = this->ContourValues->GetNumberOfContours();
double *contourValues = this->ContourValues->GetValues();
double *contourValuesEnd = contourValues + numContours;
double *contourIter;
int abortExecute = 0;
double range[2];
// Create objects to hold output of contour operation
//
estimatedSize = static_cast<vtkIdType>(
pow(static_cast<double>(numCells),.75)) * numContours;
estimatedSize = estimatedSize / 1024 * 1024; //multiple of 1024
if (estimatedSize < 1024)
{
estimatedSize = 1024;
}
newPoints = vtkPoints::New();
// set precision for the points in the output
if(this->OutputPointsPrecision == vtkAlgorithm::DEFAULT_PRECISION)
{
vtkPointSet *inputPointSet = vtkPointSet::SafeDownCast(input);
if(inputPointSet)
{
newPoints->SetDataType(inputPointSet->GetPoints()->GetDataType());
}
else
{
newPoints->SetDataType(VTK_FLOAT);
}
}
else if(this->OutputPointsPrecision == vtkAlgorithm::SINGLE_PRECISION)
{
newPoints->SetDataType(VTK_FLOAT);
}
else if(this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
{
newPoints->SetDataType(VTK_DOUBLE);
}
newPoints->Allocate(estimatedSize,estimatedSize/2);
newVerts = vtkCellArray::New();
newVerts->Allocate(estimatedSize,estimatedSize/2);
newLines = vtkCellArray::New();
newLines->Allocate(estimatedSize,estimatedSize/2);
newPolys = vtkCellArray::New();
newPolys->Allocate(estimatedSize,estimatedSize/2);
cutScalars = vtkDoubleArray::New();
cutScalars->SetNumberOfTuples(numPts);
// Interpolate data along edge. If generating cut scalars, do necessary setup
if ( this->GenerateCutScalars )
{
inPD = vtkPointData::New();
inPD->ShallowCopy(input->GetPointData());//copies original attributes
inPD->SetScalars(cutScalars);
}
else
{
inPD = input->GetPointData();
}
outPD = output->GetPointData();
outPD->InterpolateAllocate(inPD,estimatedSize,estimatedSize/2);
outCD->CopyAllocate(inCD,estimatedSize,estimatedSize/2);
// locator used to merge potentially duplicate points
if ( this->Locator == NULL )
{
this->CreateDefaultLocator();
}
this->Locator->InitPointInsertion (newPoints, input->GetBounds());
// Loop over all points evaluating scalar function at each point
//
for ( i=0; i < numPts; i++ )
{
s = this->CutFunction->FunctionValue(input->GetPoint(i));
cutScalars->SetComponent(i,0,s);
}
// Compute some information for progress methods
//
vtkIdType numCuts = numContours*numCells;
vtkIdType progressInterval = numCuts/20 + 1;
int cut=0;
vtkSmartPointer<vtkCellIterator> cellIter =
vtkSmartPointer<vtkCellIterator>::Take(input->NewCellIterator());
vtkNew<vtkGenericCell> cell;
vtkIdList *pointIdList;
double *scalarArrayPtr = cutScalars->GetPointer(0);
double tempScalar;
cellScalars = cutScalars->NewInstance();
cellScalars->SetNumberOfComponents(cutScalars->GetNumberOfComponents());
cellScalars->Allocate(VTK_CELL_SIZE*cutScalars->GetNumberOfComponents());
vtkContourHelper helper(this->Locator, newVerts, newLines, newPolys,inPD, inCD, outPD,outCD, estimatedSize,this->GenerateTriangles!=0);
if ( this->SortBy == VTK_SORT_BY_CELL )
{
// Loop over all contour values. Then for each contour value,
// loop over all cells.
//
for (iter=0; iter < numContours && !abortExecute; iter++)
{
// Loop over all cells; get scalar values for all cell points
// and process each cell.
//
for (cellIter->InitTraversal();
!cellIter->IsDoneWithTraversal() && !abortExecute;
cellIter->GoToNextCell())
{
if ( !(++cut % progressInterval) )
{
vtkDebugMacro(<<"Cutting #" << cut);
this->UpdateProgress (static_cast<double>(cut)/numCuts);
abortExecute = this->GetAbortExecute();
}
pointIdList = cellIter->GetPointIds();
numCellPts = pointIdList->GetNumberOfIds();
ptIds = pointIdList->GetPointer(0);
//find min and max values in scalar data
range[0] = range[1] = scalarArrayPtr[ptIds[0]];
for (i = 1; i < numCellPts; i++)
{
tempScalar = scalarArrayPtr[ptIds[i]];
range[0] = std::min(range[0], tempScalar);
range[1] = std::max(range[1], tempScalar);
} // for all points in this cell
int needCell = 0;
double val = this->ContourValues->GetValue(iter);
if (val >= range[0] && val <= range[1])
{
needCell = 1;
}
if (needCell)
{
cellIter->GetCell(cell.GetPointer());
cellIds = cell->GetPointIds();
cutScalars->GetTuples(cellIds,cellScalars);
// Loop over all contour values.
for (iter=0; iter < numContours && !abortExecute; iter++)
{
if ( !(++cut % progressInterval) )
{
vtkDebugMacro(<<"Cutting #" << cut);
this->UpdateProgress (static_cast<double>(cut)/numCuts);
abortExecute = this->GetAbortExecute();
}
value = this->ContourValues->GetValue(iter);
helper.Contour(cell.GetPointer(), value, cellScalars,
cellIter->GetCellId());
}
}
} // for all cells
} // for all contour values
} // sort by cell
else // SORT_BY_VALUE:
{
// Three passes over the cells to process lower dimensional cells first.
// For poly data output cells need to be added in the order:
// verts, lines and then polys, or cell data gets mixed up.
// A better solution is to have an unstructured grid output.
// I create a table that maps cell type to cell dimensionality,
// because I need a fast way to get cell dimensionality.
// This assumes GetCell is slow and GetCellType is fast.
// I do not like hard coding a list of cell types here,
// but I do not want to add GetCellDimension(vtkIdType cellId)
// to the vtkDataSet API. Since I anticipate that the output
// will change to vtkUnstructuredGrid. This temporary solution
// is acceptable.
//
int cellType;
unsigned char cellTypeDimensions[VTK_NUMBER_OF_CELL_TYPES];
vtkCutter::GetCellTypeDimensions(cellTypeDimensions);
int dimensionality;
// We skip 0d cells (points), because they cannot be cut (generate no data).
for (dimensionality = 1; dimensionality <= 3; ++dimensionality)
{
// Loop over all cells; get scalar values for all cell points
// and process each cell.
//
for (cellIter->InitTraversal();
!cellIter->IsDoneWithTraversal() && !abortExecute;
cellIter->GoToNextCell())
{
// Just fetch the cell type -- least expensive.
cellType = cellIter->GetCellType();
// Protect against new cell types added.
if (cellType >= VTK_NUMBER_OF_CELL_TYPES)
{
vtkErrorMacro("Unknown cell type " << cellType);
continue;
}
// Check if the type is valid for this pass
if (cellTypeDimensions[cellType] != dimensionality)
{
continue;
}
// Just fetch the cell point ids -- moderately expensive.
pointIdList = cellIter->GetPointIds();
numCellPts = pointIdList->GetNumberOfIds();
ptIds = pointIdList->GetPointer(0);
//find min and max values in scalar data
range[0] = range[1] = scalarArrayPtr[ptIds[0]];
for (i = 1; i < numCellPts; ++i)
{
tempScalar = scalarArrayPtr[ptIds[i]];
range[0] = std::min(range[0], tempScalar);
range[1] = std::max(range[1], tempScalar);
} // for all points in this cell
// Check if the full cell is needed
int needCell = 0;
for (contourIter = contourValues; contourIter != contourValuesEnd;
++contourIter)
{
if (*contourIter >= range[0] && *contourIter <= range[1])
{
needCell = 1;
break;
}
}
if (needCell)
{
// Fetch the full cell -- most expensive.
cellIter->GetCell(cell.GetPointer());
cutScalars->GetTuples(pointIdList, cellScalars);
// Loop over all contour values.
for (contourIter = contourValues; contourIter != contourValuesEnd;
++contourIter)
{
if (dimensionality == 3 && !(++cut % progressInterval) )
{
vtkDebugMacro(<<"Cutting #" << cut);
this->UpdateProgress (static_cast<double>(cut)/numCuts);
abortExecute = this->GetAbortExecute();
}
helper.Contour(cell.GetPointer(), *contourIter, cellScalars,
cellIter->GetCellId());
} // for all contour values
} // if need cell
} // for all cells
} // for all dimensions (1,2,3).
} // sort by value
// Update ourselves. Because we don't know upfront how many verts, lines,
// polys we've created, take care to reclaim memory.
//
cellScalars->Delete();
cutScalars->Delete();
if ( this->GenerateCutScalars )
{
inPD->Delete();
}
output->SetPoints(newPoints);
newPoints->Delete();
if (newVerts->GetNumberOfCells())
{
output->SetVerts(newVerts);
}
newVerts->Delete();
if (newLines->GetNumberOfCells())
{
output->SetLines(newLines);
}
newLines->Delete();
if (newPolys->GetNumberOfCells())
{
output->SetPolys(newPolys);
}
newPolys->Delete();
this->Locator->Initialize();//release any extra memory
output->Squeeze();
}
//----------------------------------------------------------------------------
// Specify a spatial locator for merging points. By default,
// an instance of vtkMergePoints is used.
void vtkCutter::CreateDefaultLocator()
{
if ( this->Locator == NULL )
{