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¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
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.