VTK/Examples/Cxx/PolyData/PolyDataGetPoint

This example demonstrates how to obtain the coordinates of a point in a vtkPolyData object.

• Suggested by Sara Rolfe

PolyDataGetPoint.cxx

#include <vtkSphereSource.h>
#include <vtkSmartPointer.h>
#include <vtkPolyData.h>

int main(int, char*[])
{
  // Create a sphere
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  vtkPolyData* polydata = sphereSource->GetOutput();

  // Write all of the coordinates of the points in the vtkPolyData to the console.
  for(vtkIdType i = 0; i < polydata->GetNumberOfPoints(); i++)
    {
    double p[3];
    polydata->GetPoint(i,p);
    // This is identical to:
    // polydata->GetPoints()->GetPoint(i,p);
    std::cout << "Point " << i << " : (" << p[0] << " " << p[1] << " " << p[2] << ")" << std::endl;
    }

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(PolyDataGetPoint)

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

add_executable(PolyDataGetPoint MACOSX_BUNDLE PolyDataGetPoint.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(PolyDataGetPoint ${VTK_LIBRARIES})
else()
  target_link_libraries(PolyDataGetPoint vtkHybrid vtkWidgets)
endif()

Download and Build PolyDataGetPoint

Click here to download PolyDataGetPoint. and its CMakeLists.txt file.

Once the tarball PolyDataGetPoint.tar has been downloaded and extracted,

cd PolyDataGetPoint/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:

./PolyDataGetPoint

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.