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PointLocatorRadius

vtk-examples/Cxx/PolyData/PointLocatorRadius

Question

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Code

PointLocatorRadius.cxx

#include <vtkIdList.h>
#include <vtkNew.h>
#include <vtkObjectFactory.h>
#include <vtkPointLocator.h>
#include <vtkPointSource.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>

int main(int, char*[])
{
  vtkNew<vtkPointSource> pointSource;
  pointSource->SetNumberOfPoints(400);
  pointSource->Update();

  // Create the tree
  vtkNew<vtkPointLocator> pointLocator;
  pointLocator->SetDataSet(pointSource->GetOutput());
  pointLocator->AutomaticOn();
  pointLocator->SetNumberOfPointsPerBucket(2);
  pointLocator->BuildLocator();

  double radius = 0.1;
  double center[3] = {0.0, 0.0, 0.0};
  vtkNew<vtkIdList> result;
  pointLocator->FindPointsWithinRadius(radius, center, result);

  for (vtkIdType i = 0; i < result->GetNumberOfIds(); i++)
  {
    unsigned int id = result->GetId(i);
    std::cout << "id of point " << i << " : " << id << std::endl;
  }

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(PointLocatorRadius)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping PointLocatorRadius: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(PointLocatorRadius MACOSX_BUNDLE PointLocatorRadius.cxx )
  target_link_libraries(PointLocatorRadius PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(PointLocatorRadius MACOSX_BUNDLE PointLocatorRadius.cxx )
  target_link_libraries(PointLocatorRadius PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS PointLocatorRadius
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build PointLocatorRadius

Click here to download PointLocatorRadius and its CMakeLists.txt file. Once the tarball PointLocatorRadius.tar has been downloaded and extracted,

cd PointLocatorRadius/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:

./PointLocatorRadius

WINDOWS USERS

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