VTK/Examples/Cxx/PolyData/NullPoint

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NullPoint.cxx

#include <vtkPoints.h>
#include <vtkPointData.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkFloatArray.h>
 
int main(int, char *[])
{
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(1,1,1);
  points->InsertNextPoint(2,2,2);
  points->InsertNextPoint(3,3,3);
 
  vtkSmartPointer<vtkPolyData> polydata =
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(points);
 
  vtkSmartPointer<vtkFloatArray> floatArray =
    vtkSmartPointer<vtkFloatArray>::New();
  floatArray->SetNumberOfValues(3);
  floatArray->SetNumberOfComponents(1);
  floatArray->SetName("FloatArray");
  for(vtkIdType i = 0; i < 3; i++)
    {
    floatArray->SetValue(i,2);
    }
  polydata->GetPointData()->AddArray(floatArray);
 
  vtkSmartPointer<vtkIntArray> intArray =
    vtkSmartPointer<vtkIntArray>::New();
  intArray->SetNumberOfValues(3);
  intArray->SetNumberOfComponents(1);
  intArray->SetName("IntArray");
  for(vtkIdType i = 0; i < 3; i++)
    {
    intArray->SetValue(i,2);
    }
 
  polydata->GetPointData()->AddArray(intArray);
 
  for(vtkIdType i = 0; i < 3; i++)
    {
    double p[3];
    polydata->GetPoint(i,p);
    vtkFloatArray* pointsFloatArray = vtkFloatArray::SafeDownCast(polydata->GetPointData()->GetArray("FloatArray"));
    vtkIntArray* pointsIntArray = vtkIntArray::SafeDownCast(polydata->GetPointData()->GetArray("IntArray"));
    std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " " << p[2] << " "
              << pointsFloatArray->GetValue(i) << " " << pointsIntArray->GetValue(i) << std::endl;
    }
 
  polydata->GetPointData()->NullPoint(1);
  polydata->Modified();
 
  for(vtkIdType i = 0; i < 3; i++)
    {
    double p[3];
    polydata->GetPoint(i,p);
    vtkFloatArray* pointsFloatArray = vtkFloatArray::SafeDownCast(polydata->GetPointData()->GetArray("FloatArray"));
    vtkIntArray* pointsIntArray = vtkIntArray::SafeDownCast(polydata->GetPointData()->GetArray("IntArray"));
    std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " " << p[2] << " "
              << pointsFloatArray->GetValue(i) << " " << pointsIntArray->GetValue(i) << std::endl;
 
    }
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

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

Download and Build NullPoint

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

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

cd NullPoint/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:

./NullPoint

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.