KdTree
VTKExamples/Cxx/DataStructures/KdTree
Description
This example demonstrates how to use vtkKdTree to build a tree from a vtkPoints object. Note that since AddDataSet or SetDataSet were not called, you cannot use GetDataSet.
Code
KdTree.cxx
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkIdList.h>
#include <vtkKdTree.h>
#include <vtkVertexGlyphFilter.h>
int main(int, char *[])
{
//Setup point coordinates
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(x);
points->InsertNextPoint(y);
points->InsertNextPoint(z);
//Create the tree
vtkSmartPointer<vtkKdTree> kDTree =
vtkSmartPointer<vtkKdTree>::New();
kDTree->BuildLocatorFromPoints(points);
double testPoint[3] = {2.0, 0.0, 0.0};
//Find the closest points to TestPoint
double closestPointDist;
vtkIdType id = kDTree->FindClosestPoint(testPoint, closestPointDist); //vtkKdTree::FindClosestPoint: must build locator first
std::cout << "The closest point is point " << id << std::endl;
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(KdTree)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(KdTree MACOSX_BUNDLE KdTree.cxx)
target_link_libraries(KdTree ${VTK_LIBRARIES})
Download and Build KdTree
Click here to download KdTree and its CMakeLists.txt file. Once the tarball KdTree.tar has been downloaded and extracted,
cd KdTree/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:
./KdTree
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.