OctreeFindPointsWithinRadius
VTKExamples/Cxx/DataStructures/OctreeFindPointsWithinRadius
Question
If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum
Code¶
OctreeFindPointsWithinRadius.cxx
#include <vtkCellArray.h> #include <vtkIdList.h> #include <vtkOctreePointLocator.h> #include <vtkPointSource.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkSmartPointer.h> int main(int, char*[]) { // Create some random points auto pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetNumberOfPoints(10); pointSource->Update(); // Create the tree auto octree = vtkSmartPointer<vtkOctreePointLocator>::New(); octree->SetDataSet(pointSource->GetOutput()); octree->BuildLocator(); // Find the k closest points to (0,0,0) vtkIdType k = 1; double testPoint[3] = {0.0, 0.0, 0.0}; auto result = vtkSmartPointer<vtkIdList>::New(); octree->FindPointsWithinRadius(1.0, 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 3.3 FATAL_ERROR) project(OctreeFindPointsWithinRadius) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersSources QUIET) if (NOT VTK_FOUND) message("Skipping OctreeFindPointsWithinRadius: ${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(OctreeFindPointsWithinRadius MACOSX_BUNDLE OctreeFindPointsWithinRadius.cxx ) target_link_libraries(OctreeFindPointsWithinRadius PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(OctreeFindPointsWithinRadius MACOSX_BUNDLE OctreeFindPointsWithinRadius.cxx ) target_link_libraries(OctreeFindPointsWithinRadius PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS OctreeFindPointsWithinRadius MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build OctreeFindPointsWithinRadius¶
Click here to download OctreeFindPointsWithinRadius and its CMakeLists.txt file. Once the tarball OctreeFindPointsWithinRadius.tar has been downloaded and extracted,
cd OctreeFindPointsWithinRadius/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:
./OctreeFindPointsWithinRadius
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.