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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkHyperTreeGrid.h"
#include "vtkHyperTreeGridNonOrientedGeometryCursor.h"
#include "vtkHyperTreeGridThreshold.h"
#include "vtkNew.h"
#include "vtkRandomHyperTreeGridSource.h"
#include "vtkTestUtilities.h"
#include <chrono>
/**
* Test that all 3 methods for HTG thresholding give an equivalent analytic result
*/
int TestHyperTreeGridThresholdMethods(int, char*[])
{
constexpr double THRESHOLD_MIN = 0.0;
constexpr double THRESHOLD_MAX = 5.0;
vtkNew<vtkRandomHyperTreeGridSource> source;
source->SetDimensions(3, 3, 3);
source->SetMaxDepth(5);
source->SetMaskedFraction(0.2);
source->SetSeed(3);
source->SetSplitFraction(0.8);
source->Update();
vtkHyperTreeGrid* inputHTG = source->GetHyperTreeGridOutput();
inputHTG->GetCellData()->SetScalars(inputHTG->GetCellData()->GetArray("Depth"));
// Threshold using masks
std::chrono::time_point<std::chrono::system_clock> start = std::chrono::system_clock::now();
vtkNew<vtkHyperTreeGridThreshold> thresholdMask;
thresholdMask->SetInputConnection(source->GetOutputPort());
thresholdMask->SetMemoryStrategy(vtkHyperTreeGridThreshold::MaskInput);
thresholdMask->ThresholdBetween(THRESHOLD_MIN, THRESHOLD_MAX);
thresholdMask->Update();
vtkHyperTreeGrid* htgMask = thresholdMask->GetHyperTreeGridOutput();
std::chrono::duration<double> elapsed_seconds = std::chrono::system_clock::now() - start;
std::cout << "Mask threshold method took " << elapsed_seconds.count() << "s" << std::endl;
// Threshold using deep copy of structure
start = std::chrono::system_clock::now();
vtkNew<vtkHyperTreeGridThreshold> thresholdCopy;
thresholdCopy->SetInputConnection(source->GetOutputPort());
thresholdCopy->SetMemoryStrategy(vtkHyperTreeGridThreshold::DeepThreshold);
thresholdCopy->ThresholdBetween(THRESHOLD_MIN, THRESHOLD_MAX);
thresholdCopy->Update();
vtkHyperTreeGrid* htgCopy = thresholdCopy->GetHyperTreeGridOutput();
elapsed_seconds = std::chrono::system_clock::now() - start;
std::cout << "Deep copy threshold method took " << elapsed_seconds.count() << "s" << std::endl;
// Threshold using indexed arrays
start = std::chrono::system_clock::now();
vtkNew<vtkHyperTreeGridThreshold> thresholdIndex;
thresholdIndex->SetInputConnection(source->GetOutputPort());
thresholdIndex->SetMemoryStrategy(vtkHyperTreeGridThreshold::CopyStructureAndIndexArrays);
thresholdIndex->ThresholdBetween(THRESHOLD_MIN, THRESHOLD_MAX);
thresholdIndex->Update();
vtkHyperTreeGrid* htgIndex = thresholdIndex->GetHyperTreeGridOutput();
elapsed_seconds = std::chrono::system_clock::now() - start;
std::cout << "Indexed arrays threshold method took " << elapsed_seconds.count() << "s"
<< std::endl;
if (!vtkTestUtilities::CompareDataObjects(htgMask, htgCopy))
{
std::cerr << "Mask and copy method do not give the same result" << std::endl;
return EXIT_FAILURE;
}
else if (!vtkTestUtilities::CompareDataObjects(htgMask, htgIndex))
{
std::cerr << "Mask and copy index array do not give the same result" << std::endl;
return EXIT_FAILURE;
}
else if (!vtkTestUtilities::CompareDataObjects(htgIndex, htgCopy))
{
// Technically redundant
std::cerr << "Index array and copy method do not give the same result" << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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