BuildOctree
VTKExamples/Cxx/DataStructures/BuildOctree
Code¶
BuildOctree.cxx
#include <vtkSmartPointer.h> #include <vtkPoints.h> #include <vtkCellArray.h> #include <vtkPolyData.h> #include <vtkXMLPolyDataReader.h> #include <vtkIdList.h> #include <vtkOctreePointLocator.h> #include <vtkDataSetCollection.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(); vtkSmartPointer<vtkCellArray> vertices = vtkSmartPointer<vtkCellArray>::New(); for(unsigned int i = 0; i < 3; ++i) { points->InsertNextPoint ( x[i], y[i], z[i] ); } std::cout << "There are " << points->GetNumberOfPoints() << " points." << std::endl; vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); polydata->SetPoints(points); //Create the tree vtkSmartPointer<vtkOctreePointLocator> octree = vtkSmartPointer<vtkOctreePointLocator>::New(); octree->SetDataSet(polydata); octree->BuildLocator(); std::cout << "Number of points in tree: " << octree->GetDataSet()->GetNumberOfPoints() << std::endl; double p[3]; octree->GetDataSet()->GetPoint(0,p); std::cout << "p: " << p[0] << " " << p[1] << " " << p[2] << std::endl; return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(BuildOctree) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(BuildOctree MACOSX_BUNDLE BuildOctree.cxx) target_link_libraries(BuildOctree ${VTK_LIBRARIES})
Download and Build BuildOctree¶
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 Some tarballs may be missing or out-of-date.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 BuildOctree and its CMakeLists.txt file. Once the tarball BuildOctree.tar has been downloaded and extracted,
cd BuildOctree/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:
./BuildOctree
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.