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
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.