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¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
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.