VTK/Examples/Cxx/PolyData/GeometryFilter

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This 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.

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;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(GeometryFilter)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
if (APPLE)
  add_executable(GeometryFilter MACOSX_BUNDLE GeometryFilter.cxx)
else()
  add_executable(GeometryFilter GeometryFilter.cxx)
endif()
 
if(VTK_LIBRARIES)
  target_link_libraries(GeometryFilter ${VTK_LIBRARIES})
else()
  target_link_libraries(GeometryFilter vtkHybrid )
endif()

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.

Retrieved from "http://batchmake.org/Wiki/VTK/Examples/Cxx/PolyData/GeometryFilter"
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