BuildLocatorFromKClosestPoints
VTKExamples/Cxx/DataStructures/BuildLocatorFromKClosestPoints
Question
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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 3.3 FATAL_ERROR) project(BuildLocatorFromKClosestPoints) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersSources QUIET) if (NOT VTK_FOUND) message("Skipping BuildLocatorFromKClosestPoints: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION: ${VTK_VERSION}") if (VTK_VERSION VERSION_LESS "8.90.0") # old system include(${VTK_USE_FILE}) add_executable(BuildLocatorFromKClosestPoints MACOSX_BUNDLE BuildLocatorFromKClosestPoints.cxx ) target_link_libraries(BuildLocatorFromKClosestPoints PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(BuildLocatorFromKClosestPoints MACOSX_BUNDLE BuildLocatorFromKClosestPoints.cxx ) target_link_libraries(BuildLocatorFromKClosestPoints PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS BuildLocatorFromKClosestPoints MODULES ${VTK_LIBRARIES} ) endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.