PolyDataToUnstructuredGrid
VTKExamples/Cxx/PolyData/PolyDataToUnstructuredGrid
Description
There is not a filter whose sole purpose is converting a vtkPolyData to a vtkUnstructuredGrid. However, the append filter can accept any type of input, and produces a vtkUnstructuredGrid, so we can use it for this purpose.
Code
PolyDataToUnstructuredGrid.cxx
#include <vtkAppendFilter.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkUnstructuredGrid.h>
#include <vtkVersion.h>
#include <vtkXMLUnstructuredGridWriter.h>
int main(int, char *[])
{
// Create a sphere
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(5.0);
sphereSource->Update();
// Combine the two data sets
vtkSmartPointer<vtkAppendFilter> appendFilter =
vtkSmartPointer<vtkAppendFilter>::New();
#if VTK_MAJOR_VERSION <= 5
appendFilter->AddInput(sphereSource->GetOutput());
#else
appendFilter->AddInputData(sphereSource->GetOutput());
#endif
appendFilter->Update();
vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid =
vtkSmartPointer<vtkUnstructuredGrid>::New();
unstructuredGrid->ShallowCopy(appendFilter->GetOutput());
// Write the unstructured grid
vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer =
vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
writer->SetFileName("UnstructuredGrid.vtu");
#if VTK_MAJOR_VERSION <= 5
writer->SetInput(unstructuredGrid);
#else
writer->SetInputData(unstructuredGrid);
#endif
writer->Write();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(PolyDataToUnstructuredGrid)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(PolyDataToUnstructuredGrid MACOSX_BUNDLE PolyDataToUnstructuredGrid.cxx)
target_link_libraries(PolyDataToUnstructuredGrid ${VTK_LIBRARIES})
Download and Build PolyDataToUnstructuredGrid
Click here to download PolyDataToUnstructuredGrid and its CMakeLists.txt file. Once the tarball PolyDataToUnstructuredGrid.tar has been downloaded and extracted,
cd PolyDataToUnstructuredGrid/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:
./PolyDataToUnstructuredGrid
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.