ClosestNPoints
VTKExamples/Cxx/DataStructures/KdTreePointLocator/ClosestNPoints
Code
ClosestNPoints.cxx
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPointSource.h>
#include <vtkPolyData.h>
#include <vtkCellArray.h>
#include <vtkIdList.h>
#include <vtkKdTreePointLocator.h>
int main(int, char *[])
{
//Create some random points
vtkSmartPointer<vtkPointSource> pointSource =
vtkSmartPointer<vtkPointSource>::New();
pointSource->SetNumberOfPoints(10);
pointSource->Update();
//Create the tree
vtkSmartPointer<vtkKdTreePointLocator> pointTree =
vtkSmartPointer<vtkKdTreePointLocator>::New();
pointTree->SetDataSet(pointSource->GetOutput());
pointTree->BuildLocator();
// Find the k closest points to (0,0,0)
unsigned int k = 1;
double testPoint[3] = {0.0, 0.0, 0.0};
vtkSmartPointer<vtkIdList> result =
vtkSmartPointer<vtkIdList>::New();
pointTree->FindClosestNPoints(k, testPoint, result);
for(vtkIdType i = 0; i < k; i++)
{
vtkIdType point_ind = result->GetId(i);
double p[3];
pointSource->GetOutput()->GetPoint(point_ind, p);
std::cout << "Closest point " << i << ": Point "
<< point_ind << ": (" << p[0] << ", " << p[1] << ", " << p[2] << ")" << std::endl;
}
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ClosestNPoints)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ClosestNPoints MACOSX_BUNDLE ClosestNPoints.cxx)
target_link_libraries(ClosestNPoints ${VTK_LIBRARIES})
Download and Build ClosestNPoints
Click here to download ClosestNPoints and its CMakeLists.txt file. Once the tarball ClosestNPoints.tar has been downloaded and extracted,
cd ClosestNPoints/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:
./ClosestNPoints
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.