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¶
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 Some tarballs may be missing or out-of-date.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 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.