BuildLocatorFromKClosestPoints
VTKExamples/Cxx/DataStructures/BuildLocatorFromKClosestPoints
Code
BuildLocatorFromKClosestPoints.cxx
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPointSource.h>
#include <vtkIdList.h>
#include <vtkKdTree.h>
int main(int, char *[])
{
// Create some points
double origin[3] = {0.0, 0.0, 0.0};
double x[3] = {1.0, 0.0, 0.0};
double y[3] = {0.0, 1.0, 0.0};
double z[3] = {0.0, 0.0, 1.0};
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(origin);
points->InsertNextPoint(x);
points->InsertNextPoint(y);
points->InsertNextPoint(z);
// Create the tree
vtkSmartPointer<vtkKdTree> pointTree =
vtkSmartPointer<vtkKdTree>::New();
pointTree->BuildLocatorFromPoints(points);
// Find the 2 closest points to (0.5,0,0)
vtkIdType k = 2;
double testPoint[3] = {0.5, 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];
points->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(BuildLocatorFromKClosestPoints)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(BuildLocatorFromKClosestPoints MACOSX_BUNDLE BuildLocatorFromKClosestPoints.cxx)
target_link_libraries(BuildLocatorFromKClosestPoints ${VTK_LIBRARIES})
Download and Build BuildLocatorFromKClosestPoints
Click here to download BuildLocatorFromKClosestPoints and its CMakeLists.txt file. Once the tarball BuildLocatorFromKClosestPoints.tar has been downloaded and extracted,
cd BuildLocatorFromKClosestPoints/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:
./BuildLocatorFromKClosestPoints
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.