VTK/Examples/Cxx/PolyData/DeletePoint

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DeletePoint.cxx

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
 
void OutputPoints(vtkSmartPointer<vtkPoints> points);
void ReallyDeletePoint(vtkSmartPointer<vtkPoints> points, vtkIdType id);
 
int main(int, char *[])
{
  // Create a set of points
  vtkSmartPointer<vtkPoints> points = 
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint ( 1.0, 0.0, 0.0 );
  points->InsertNextPoint ( 0.0, 1.0, 0.0 );
  points->InsertNextPoint ( 0.0, 0.0, 1.0 );
 
  std::cout << "Number of points: " << points->GetNumberOfPoints() << std::endl;
  OutputPoints(points);
 
  ReallyDeletePoint(points, 1);  
 
  std::cout << "Number of points: " << points->GetNumberOfPoints() << std::endl;
  OutputPoints(points);
 
  return EXIT_SUCCESS;
}
 
void OutputPoints(vtkSmartPointer<vtkPoints> points)
{
  for(vtkIdType i = 0; i < points->GetNumberOfPoints(); i++)
    {
    double p[3];
    points->GetPoint(i,p);
    cout << p[0] << " " << p[1] << " " << p[2] << endl;
    }
}
 
void ReallyDeletePoint(vtkSmartPointer<vtkPoints> points, vtkIdType id)
{
  vtkSmartPointer<vtkPoints> newPoints = 
    vtkSmartPointer<vtkPoints>::New();
 
  for(vtkIdType i = 0; i < points->GetNumberOfPoints(); i++)
    {
    if(i != id)
      {
      double p[3];
      points->GetPoint(i,p);
      newPoints->InsertNextPoint(p);
      }
    }
 
  points->ShallowCopy(newPoints);
}

Please try the new VTKExamples website.

CMakeLists.txt

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

Download and Build DeletePoint

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

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

cd DeletePoint/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:

./DeletePoint

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.