MeshQuality
VTKExamples/Cxx/PolyData/MeshQuality
Description
This example uses one of many selectable methods to determine the quality of a mesh. In this case, we have selected to use the area of the triangles. We show how to retrieve the quality metric computed on each triangle after the process is completed.
Code
MeshQuality.cxx
#include <vtkVersion.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkCellData.h>
#include <vtkDoubleArray.h>
#include <vtkDataSet.h>
#include <vtkMeshQuality.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkTriangleFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkTriangleFilter> triangleFilter =
vtkSmartPointer<vtkTriangleFilter>::New();
triangleFilter->SetInputConnection(sphereSource->GetOutputPort());
triangleFilter->Update();
vtkPolyData* mesh = triangleFilter->GetOutput();
std::cout << "There are " << mesh->GetNumberOfCells() << " cells." << std::endl;
vtkSmartPointer<vtkMeshQuality> qualityFilter =
vtkSmartPointer<vtkMeshQuality>::New();
#if VTK_MAJOR_VERSION <= 5
qualityFilter->SetInputConnection(mesh->GetProducerPort());
#else
qualityFilter->SetInputData(mesh);
#endif
qualityFilter->SetTriangleQualityMeasureToArea();
qualityFilter->Update();
vtkSmartPointer<vtkDoubleArray> qualityArray =
vtkDoubleArray::SafeDownCast(qualityFilter->GetOutput()->GetCellData()->GetArray("Quality"));
std::cout << "There are " << qualityArray->GetNumberOfTuples() << " values." << std::endl;
for(vtkIdType i = 0; i < qualityArray->GetNumberOfTuples(); i++)
{
double val = qualityArray->GetValue(i);
std::cout << "value " << i << " : " << val << std::endl;
}
vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();
polydata->ShallowCopy(qualityFilter->GetOutput());
// Visualize
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
mapper->SetInputConnection(polydata->GetProducerPort());
#else
mapper->SetInputData(polydata);
#endif
mapper->SetScalarRange(polydata->GetScalarRange());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(.3, .6, .3); // Background color green
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(MeshQuality)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(MeshQuality MACOSX_BUNDLE MeshQuality.cxx)
target_link_libraries(MeshQuality ${VTK_LIBRARIES})
Download and Build MeshQuality
Click here to download MeshQuality and its CMakeLists.txt file. Once the tarball MeshQuality.tar has been downloaded and extracted,
cd MeshQuality/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./MeshQuality
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.