DeletePoint

#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkSmartPointer.h>

namespace {
void OutputPoints(vtkSmartPointer<vtkPoints> points);
void ReallyDeletePoint(vtkSmartPointer<vtkPoints> points, vtkIdType id);
} // namespace

int main(int, char*[])
{
  // Create a set of points.
  vtkNew<vtkPoints> points;
  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;
}

namespace {
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)
{
  vtkNew<vtkPoints> newPoints;

  for (vtkIdType i = 0; i < points->GetNumberOfPoints(); i++)
  {
    if (i != id)
    {
      double p[3];
      points->GetPoint(i, p);
      newPoints->InsertNextPoint(p);
    }
  }

  points->ShallowCopy(newPoints);
}
} // namespace

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(DeletePoint)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "DeletePoint: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(DeletePoint MACOSX_BUNDLE DeletePoint.cxx )
  target_link_libraries(DeletePoint PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS DeletePoint
  MODULES ${VTK_LIBRARIES}
)

cd DeletePoint/build

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./DeletePoint