ITK/Examples/Meshes/PointAndCellData

WARNING: This is a temporary example, intended to illustrate an issue [1] being discussed on the ITK mailing list. The example will be revised or removed when the issue is resolved.

[1] http://itk-insight-users.2283740.n2.nabble.com/Do-any-of-the-mesh-file-formats-store-CellData-td7587666.html

Contributed by: Davis Vigneault

PointAndCellData.cxx

<source lang="cpp">

1. include "itkMesh.h"
2. include "itkRegularSphereMeshSource.h"
3. include "itkMeshFileWriter.h"

const unsigned int Dimension = 3; typedef float TCoordinate;

typedef itk::Mesh< TCoordinate, Dimension > TMesh; typedef itk::RegularSphereMeshSource< TMesh > TSphere; typedef itk::MeshFileWriter< TMesh > TMeshWriter;

int main() {

 TSphere::Pointer sphere = TSphere::New();
 sphere->Update();

 TMesh::Pointer mesh = sphere->GetOutput();
 double value = 10;
 for (unsigned int i = 0; i < mesh->GetNumberOfCells(); ++i)
   mesh->SetCellData( i, value );

 for (unsigned int i = 0; i < mesh->GetNumberOfPoints(); ++i)
   mesh->SetPointData( i, value );

 std::cout << mesh->GetNumberOfCells() << std::endl; // 128
 std::cout << mesh->GetCellData() << std::endl; // A pointer
 std::cout << mesh->GetCellData()->Size() << std::endl << std::endl; // 128

 std::cout << mesh->GetNumberOfPoints() << std::endl; // 66
 std::cout << mesh->GetPointData() << std::endl; // Another pointer
 std::cout << mesh->GetPointData()->Size() << std::endl << std::endl; // 66

 TMeshWriter::Pointer meshWriter = TMeshWriter::New();
 meshWriter->SetFileName( "mesh.vtk" );
 meshWriter->SetInput( mesh );
 meshWriter->Update();

 std::cout << mesh->GetNumberOfCells() << std::endl; // 128
 std::cout << mesh->GetCellData() << std::endl; // Different Pointer
 std::cout << mesh->GetCellData()->Size() << std::endl << std::endl; // 0

 std::cout << mesh->GetNumberOfPoints() << std::endl; // 66
 std::cout << mesh->GetPointData() << std::endl; // Different pointer
 std::cout << mesh->GetPointData()->Size() << std::endl << std::endl; // 0

 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

<syntaxhighlight lang="cmake"> cmake_minimum_required(VERSION 3.9.5)

project(PointAndCellData)

find_package(ITK REQUIRED) include(${ITK_USE_FILE}) if (ITKVtkGlue_LOADED)

 find_package(VTK REQUIRED)
 include(${VTK_USE_FILE})

endif()

add_executable(PointAndCellData MACOSX_BUNDLE PointAndCellData.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(PointAndCellData ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(PointAndCellData ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build PointAndCellData

Click here to download PointAndCellData and its CMakeLists.txt file. Once the tarball PointAndCellData.tar has been downloaded and extracted,

cd PointAndCellData/build

• If ITK is installed:

cmake ..

• If ITK is not installed but compiled on your system, you will need to specify the path to your ITK build:

cmake -DITK_DIR:PATH=/home/me/itk_build ..

Build the project:

make

and run it:

./PointAndCellData

WINDOWS USERS PLEASE NOTE: Be sure to add the ITK bin directory to your path. This will resolve the ITK dll's at run time.

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.

ItkVtkGlue

ITK >= 4

For examples that use QuickView (which depends on VTK), you must have built ITK with Module_ITKVtkGlue=ON.

ITK < 4

Some of the ITK Examples require VTK to display the images. If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.