ITK/Examples/Meshes/WishList/VTKPolyDataWriter

VTKPolyDataWriter.cxx

<source lang="cpp">

1. include "itkMesh.h"
2. include "itkLineCell.h"
3. include "itkVTKPolyDataWriter.h"

const unsigned int Dimension = 3; typedef itk::Mesh< float, Dimension > MeshType;

MeshType::Pointer CreateMeshWithEdges();

int main(int, char *[]) {

 MeshType::Pointer mesh = CreateMeshWithEdges();

 typedef itk::VTKPolyDataWriter<MeshType> WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetInput(mesh);
 writer->SetFileName("test.vtk");
 writer->Update();
 
 return EXIT_SUCCESS;

}

MeshType::Pointer CreateMeshWithEdges() {

 MeshType::Pointer  mesh = MeshType::New();

 // Create points
 MeshType::PointType p0,p1,p2,p3;

 p0[0]= -1.0; p0[1]= -1.0; p0[2]= 0.0; // first  point ( -1, -1, 0 )
 p1[0]=  1.0; p1[1]= -1.0; p1[2]= 0.0; // second point (  1, -1, 0 )
 p2[0]=  1.0; p2[1]=  1.0; p2[2]= 0.0; // third  point (  1,  1, 0 )
 p3[0]=  1.0; p3[1]=  1.0; p3[2]= 1.0; // third  point (  1,  1, 1 )

 mesh->SetPoint( 0, p0 );
 mesh->SetPoint( 1, p1 );
 mesh->SetPoint( 2, p2 );
 mesh->SetPoint( 3, p3 );

 std::cout << "Points = " << mesh->GetNumberOfPoints() << std::endl;

 //access points
 typedef MeshType::PointsContainer::Iterator     PointsIterator;

 PointsIterator  pointIterator = mesh->GetPoints()->Begin();

 PointsIterator end = mesh->GetPoints()->End();
 while( pointIterator != end )
   {
   MeshType::PointType p = pointIterator.Value();  // access the point
   std::cout << p << std::endl;                    // print the point
   ++pointIterator;                                // advance to next point
   }

 typedef MeshType::CellType::CellAutoPointer         CellAutoPointer;
 typedef itk::LineCell< MeshType::CellType >         LineType;

 CellAutoPointer line0;
 line0.TakeOwnership(  new LineType  );
 line0->SetPointId(0, 0); // line between points 0 and 1
 line0->SetPointId(1, 1);
 mesh->SetCell( 0, line0);

 CellAutoPointer line1;
 line1.TakeOwnership(  new LineType  );
 line1->SetPointId(0, 1); // line between points 1 and 2
 line1->SetPointId(1, 2);
 mesh->SetCell( 1, line1);

 CellAutoPointer line2;
 line2.TakeOwnership(  new LineType  );
 line2->SetPointId(0, 2); // line between points 2 and 3
 line2->SetPointId(1, 3);
 mesh->SetCell( 2, line2);

 /*
 typedef MeshType::CellsContainer::Iterator  CellIterator;
 CellIterator  cellIterator = mesh->GetCells()->Begin();
 CellIterator  CellsEnd          = mesh->GetCells()->End();

 while( cellIterator != CellsEnd )
   {
   MeshType::CellType * cellptr = cellIterator.Value();
   LineType * line = dynamic_cast<LineType *>( cellptr );

   long unsigned int* linePoint0 = line->PointIdsBegin();
   //long unsigned int* linePoint1 = line->PointIdsEnd();
   long unsigned int* linePoint1 = linePoint0+1;
   std::cout << "line first point id: " << *linePoint0 << std::endl;
   std::cout << "line second point id: " << *linePoint1 << std::endl;

   ++cellIterator;
   }
 */
 return mesh;

}

</source>

CMakeLists.txt

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

project(VTKPolyDataWriter)

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

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

endif()

add_executable(VTKPolyDataWriter MACOSX_BUNDLE VTKPolyDataWriter.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(VTKPolyDataWriter ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(VTKPolyDataWriter ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build VTKPolyDataWriter

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

cd VTKPolyDataWriter/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:

./VTKPolyDataWriter

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.