# PolyDataGetPoint

VTKExamples/Cxx/PolyData/PolyDataGetPoint

### Description¶

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

• Suggested by Sara Rolfe

### Code¶

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;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 2.8)

PROJECT(PolyDataGetPoint)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE}) add_executable(PolyDataGetPoint MACOSX_BUNDLE PolyDataGetPoint.cxx ) target_link_libraries(PolyDataGetPoint${VTK_LIBRARIES})


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

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.