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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include <iostream>
#include "itkSimplexMeshVolumeCalculator.h"
#include "itkRegularSphereMeshSource.h"
#include "itkDefaultDynamicMeshTraits.h"
#include "itkTriangleMeshToSimplexMeshFilter.h"
#include "itkTestingMacros.h"
int
itkSimplexMeshVolumeCalculatorTest(int, char *[])
{
// Declare the type of the input and output mesh
using MeshTraits = itk::DefaultDynamicMeshTraits<double, 3, 3, double, double, double>;
using TriangleMeshType = itk::Mesh<double, 3, MeshTraits>;
using SimplexMeshType = itk::SimplexMesh<double, 3, MeshTraits>;
// declare triangle mesh source
using SphereMeshSourceType = itk::RegularSphereMeshSource<TriangleMeshType>;
using PointType = SphereMeshSourceType::PointType;
using VectorType = SphereMeshSourceType::VectorType;
// Declare the type of the gradient image
using SimplexFilterType = itk::TriangleMeshToSimplexMeshFilter<TriangleMeshType, SimplexMeshType>;
auto mySphereMeshSource = SphereMeshSourceType::New();
PointType center;
center.Fill(0);
PointType::ValueType scaleInit[3] = { 10, 10, 10 };
VectorType scale = scaleInit;
mySphereMeshSource->SetCenter(center);
mySphereMeshSource->SetScale(scale);
auto simplexFilter = SimplexFilterType::New();
simplexFilter->SetInput(mySphereMeshSource->GetOutput());
using VolumeCalculatorType = itk::SimplexMeshVolumeCalculator<SimplexMeshType>;
auto calculator = VolumeCalculatorType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(calculator, SimplexMeshVolumeCalculator, Object);
calculator->SetSimplexMesh(simplexFilter->GetOutput());
for (int i = 1; i <= 5; ++i)
{
mySphereMeshSource->SetResolution(i);
simplexFilter->Update();
calculator->Compute();
std::cout << "Resolution: " << i << ", Volume: " << calculator->GetVolume() << ", Area: " << calculator->GetArea()
<< std::endl;
}
calculator->Print(std::cout);
double volume = calculator->GetVolume();
const double pi = std::atan(1.0) * 4.0;
const double knownVolume = 4.0 / 3.0 * pi * (1000.0); // scale was 10 = radius
std::cout << "knownVolume: " << knownVolume << " versus computedVolume: " << volume << std::endl;
if (itk::Math::abs(volume - knownVolume) > (1e-2 * knownVolume))
{
std::cerr << "Error in the Volume computation " << std::endl;
std::cerr << "We expected " << knownVolume << std::endl;
std::cerr << "But we got " << volume << std::endl;
return EXIT_FAILURE;
}
std::cout << "[TEST DONE]" << std::endl;
return EXIT_SUCCESS;
}
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