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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 "itkRegularSphereMeshSource.h"
#include "itkTriangleMeshCurvatureCalculator.h"
#include "itkTestingMacros.h"
#include "itkMeshFileReader.h"
/* Test the Curvature calculator for sphere source and a vtk mesh file */
int
itkTriangleMeshCurvatureCalculatorTest(int argc, char * argv[])
{
const unsigned int Dimension = 3;
using PixelType = double;
// Declare the type of the input mesh.
using TriangleMeshType = itk::Mesh<PixelType, Dimension>;
// Create Curvature calculator and set the type.
using CurvatureCalculatorType = itk::TriangleMeshCurvatureCalculator<TriangleMeshType>;
auto curvCalculator = CurvatureCalculatorType::New();
// Exercise basic object methods
ITK_EXERCISE_BASIC_OBJECT_METHODS(curvCalculator, TriangleMeshCurvatureCalculator, Object);
// Test for empty mesh, curvature data should be null.
TriangleMeshType::Pointer triangleMesh = TriangleMeshType::New();
// Test if calling Compute() before setting mesh throws error.
ITK_TRY_EXPECT_EXCEPTION(curvCalculator->Compute());
curvCalculator->SetTriangleMesh(triangleMesh);
// Test the curvature type setter and getter.
curvCalculator->SetCurvatureType(itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::MeanCurvature);
ITK_TEST_SET_GET_VALUE(itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::MeanCurvature,
curvCalculator->GetCurvatureType());
// Now test if it throws exception for not-supported curvature type.
ITK_TRY_EXPECT_EXCEPTION(curvCalculator->Compute());
curvCalculator->SetCurvatureTypeToGaussian();
// Test if Gauss curvature is set.
ITK_TEST_SET_GET_VALUE(itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::GaussCurvature,
curvCalculator->GetCurvatureType());
curvCalculator->Compute();
// Output should be null for empty mesh.
auto gaussCurvatureData = curvCalculator->GetGaussCurvatureData();
ITK_TEST_EXPECT_TRUE(gaussCurvatureData == nullptr);
// Test for Sphere mesh Source
// Declare Triangle mesh source
using SphereMeshSourceType = itk::RegularSphereMeshSource<TriangleMeshType>;
using PointType = SphereMeshSourceType::PointType;
using VectorType = SphereMeshSourceType::VectorType;
auto mySphereMeshSource = SphereMeshSourceType::New();
PointType center;
center.Fill(0);
PointType::ValueType scaleInit_1[Dimension] = { 5, 5, 5 };
VectorType scale = scaleInit_1;
mySphereMeshSource->SetCenter(center);
mySphereMeshSource->SetResolution(1);
mySphereMeshSource->SetScale(scale);
mySphereMeshSource->Update();
triangleMesh = mySphereMeshSource->GetOutput();
curvCalculator->SetTriangleMesh(triangleMesh);
curvCalculator->SetCurvatureTypeToGaussian();
curvCalculator->Compute();
gaussCurvatureData = curvCalculator->GetGaussCurvatureData();
// Values obtained using the VTK Gaussian Curvature
float v1 = 0.06087285;
float v2 = 0.04463759;
// Test if values are correct for scale 5 and resolution 1 sphere
for (unsigned int k = 0; k < triangleMesh->GetNumberOfPoints(); ++k)
{
if (k < 6)
{
ITK_TEST_EXPECT_TRUE(itk::Math::AlmostEquals(gaussCurvatureData->GetElement(k), v1));
}
else
{
ITK_TEST_EXPECT_TRUE(itk::Math::AlmostEquals(gaussCurvatureData->GetElement(k), v2));
}
}
// Test the method for different scale. The curvature should decrease for larger sphere.
PointType::ValueType scaleInit_2[Dimension] = { 100, 100, 100 };
scale = scaleInit_2;
mySphereMeshSource->SetCenter(center);
mySphereMeshSource->SetResolution(1);
mySphereMeshSource->SetScale(scale);
mySphereMeshSource->Update();
triangleMesh = mySphereMeshSource->GetOutput();
curvCalculator->SetTriangleMesh(triangleMesh);
curvCalculator->SetCurvatureTypeToGaussian();
curvCalculator->Compute();
gaussCurvatureData = curvCalculator->GetGaussCurvatureData();
float v3 = 0.00015218;
float v4 = 0.00011159;
// Test if values are correct for scale 100 and resolution 1 sphere.
for (unsigned int k = 0; k < triangleMesh->GetNumberOfPoints(); ++k)
{
if (k < 6)
{
ITK_TEST_EXPECT_TRUE(itk::Math::AlmostEquals(gaussCurvatureData->GetElement(k), v3));
}
else
{
ITK_TEST_EXPECT_TRUE(itk::Math::AlmostEquals(gaussCurvatureData->GetElement(k), v4));
}
}
// Test for non-triangle Mesh. It should throw Exception
using CellType = TriangleMeshType::CellType;
using TetrahedronType = itk::TetrahedronCell<CellType>;
CellType::CellAutoPointer cellpointer;
// Insert a Tetrahedron Cell in the mesh
// First obtain the cell on that index to be deleted to avoid memory leak
CellType::CellAutoPointer cellToDelete;
triangleMesh->GetCell(0, cellToDelete);
cellToDelete.TakeOwnership();
// Next insert a Tetrahedron Cell on that index
cellpointer.TakeOwnership(new TetrahedronType);
cellpointer->SetPointId(0, 0);
cellpointer->SetPointId(1, 1);
cellpointer->SetPointId(2, 2);
cellpointer->SetPointId(3, 3);
triangleMesh->SetCell(0, cellpointer);
curvCalculator->SetTriangleMesh(triangleMesh);
curvCalculator->SetCurvatureTypeToGaussian();
ITK_TRY_EXPECT_EXCEPTION(curvCalculator->Compute());
// Test streaming enumeration for TriangleMeshCurvatureCalculatorEnums elements
const std::set<itk::TriangleMeshCurvatureCalculatorEnums::Curvatures> allCurvatures{
itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::GaussCurvature,
itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::MeanCurvature,
itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::MinCurvature,
itk::TriangleMeshCurvatureCalculatorEnums::Curvatures::MaxCurvature
};
for (const auto & ee : allCurvatures)
{
std::cout << "STREAMED ENUM VALUE itk::TriangleMeshCurvatureCalculatorEnums::Curvatures: " << ee << std::endl;
}
// Test for a vtk mesh obtained using MeshFileReader.
if (argc > 1)
{
using ReaderType = itk::MeshFileReader<TriangleMeshType>;
ReaderType::Pointer polyDataReader = ReaderType::New();
polyDataReader->SetFileName(argv[1]);
polyDataReader->Update();
TriangleMeshType::Pointer inputMesh = polyDataReader->GetOutput();
curvCalculator->SetTriangleMesh(inputMesh);
curvCalculator->SetCurvatureTypeToGaussian();
curvCalculator->Compute();
gaussCurvatureData = curvCalculator->GetGaussCurvatureData();
ITK_TEST_EXPECT_TRUE(gaussCurvatureData->Size() == inputMesh->GetNumberOfPoints());
}
return EXIT_SUCCESS;
}
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