CellLocator
VTKExamples/Cxx/PolyData/CellLocator
Description¶
This example creates a sphere and then finds the closest point on the sphere to a test point.
Code¶
CellLocator.cxx
#include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkCellLocator.h> int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->Update(); // Create the tree vtkSmartPointer<vtkCellLocator> cellLocator = vtkSmartPointer<vtkCellLocator>::New(); cellLocator->SetDataSet(sphereSource->GetOutput()); cellLocator->BuildLocator(); double testPoint[3] = {2.0, 0.0, 0.0}; //Find the closest points to TestPoint double closestPoint[3];//the coordinates of the closest point will be returned here double closestPointDist2; //the squared distance to the closest point will be returned here vtkIdType cellId; //the cell id of the cell containing the closest point will be returned here int subId; //this is rarely used (in triangle strips only, I believe) cellLocator->FindClosestPoint(testPoint, closestPoint, cellId, subId, closestPointDist2); std::cout << "Coordinates of closest point: " << closestPoint[0] << " " << closestPoint[1] << " " << closestPoint[2] << std::endl; std::cout << "Squared distance to closest point: " << closestPointDist2 << std::endl; std::cout << "CellId: " << cellId << std::endl; return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(CellLocator) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(CellLocator MACOSX_BUNDLE CellLocator.cxx) target_link_libraries(CellLocator ${VTK_LIBRARIES})
Download and Build CellLocator¶
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 Some tarballs may be missing or out-of-date.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 CellLocator and its CMakeLists.txt file. Once the tarball CellLocator.tar has been downloaded and extracted,
cd CellLocator/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:
./CellLocator
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.