VTK/Examples/Cxx/PolyData/GeometryFilter
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Jump to navigationJump to searchThis example demonstrates how to convert an unstructured grid to a polydata. Currently nothing is done with the resulting polydata. If someone has a good data set that demonstrates the conversion, please let us know.
Contents
GeometryFilter.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkUnstructuredGrid.h>
#include <vtkCellArray.h>
#include <vtkGeometryFilter.h>
#include <vtkPointSource.h>
int main(int, char *[])
{
vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid =
vtkSmartPointer<vtkUnstructuredGrid>::New();
vtkSmartPointer<vtkGeometryFilter> geometryFilter =
vtkSmartPointer<vtkGeometryFilter>::New();
#if VTK_MAJOR_VERSION <= 5
geometryFilter->SetInput(unstructuredGrid);
#else
geometryFilter->SetInputData(unstructuredGrid);
#endif
geometryFilter->Update();
vtkPolyData* polydata = geometryFilter->GetOutput();
std::cout << "Output has " << polydata->GetNumberOfPoints() << " points." << std::endl;
return EXIT_SUCCESS;
}
Please try the new VTKExamples website.
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(GeometryFilter)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(GeometryFilter MACOSX_BUNDLE GeometryFilter.cxx)
if(VTK_LIBRARIES)
target_link_libraries(GeometryFilter ${VTK_LIBRARIES})
else()
target_link_libraries(GeometryFilter vtkHybrid vtkWidgets)
endif()
Download and Build GeometryFilter
Click here to download GeometryFilter. and its CMakeLists.txt file.
Once the tarball GeometryFilter.tar has been downloaded and extracted,
cd GeometryFilter/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:
./GeometryFilter
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.
Perform a Delaunay triangulation on a sphere. Show it in wireframe so one can see all of the internal edges. Then run the filter and show that the result is only the outer surface.