CellTreeLocator
VTKExamples/Cxx/PolyData/CellTreeLocator
Code
CellTreeLocator.cxx
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkSmartPointer.h>
#include <vtkUnstructuredGrid.h>
#include <vtkCellTreeLocator.h>
#include "vtkGenericCell.h"
int main(int, char *[])
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(1.0);
sphereSource->Update();
// Create the tree
vtkSmartPointer<vtkCellTreeLocator> cellTree =
vtkSmartPointer<vtkCellTreeLocator>::New();
cellTree->SetDataSet(sphereSource->GetOutput());
cellTree->BuildLocator();
double testInside[3] = {.5, 0.0, 0.0};
double testOutside[3] = {10.0, 0.0, 0.0};
double pcoords[3], weights[3];
vtkIdType cellId;
vtkSmartPointer<vtkGenericCell> cell = vtkSmartPointer<vtkGenericCell>::New();
int returnValue = EXIT_SUCCESS;
// Should be inside
cellId = cellTree->FindCell(testInside,0,
cell, pcoords, weights);
if (cellId>=0)
{
std::cout << "First point: in cell " << cellId << std::endl;
}
else
{
std::cout << "ERROR: Cell was not found but should have been." << std::endl;
returnValue = EXIT_FAILURE;
}
// Should be outside
cellId = cellTree->FindCell(testOutside,0,
cell, pcoords, weights);
if (cellId>=0)
{
std::cout << "ERROR: Found point in cell " << cellId
<< " but it should be outside the domain." << std::endl;
returnValue = EXIT_FAILURE;
}
else
{
std::cout << "Second point: outside" << std::endl;
}
return returnValue;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(CellTreeLocator)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(CellTreeLocator MACOSX_BUNDLE CellTreeLocator.cxx)
target_link_libraries(CellTreeLocator ${VTK_LIBRARIES})
Download and Build CellTreeLocator
Click here to download CellTreeLocator and its CMakeLists.txt file. Once the tarball CellTreeLocator.tar has been downloaded and extracted,
cd CellTreeLocator/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:
./CellTreeLocator
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.