MiscPointData
VTKExamples/Cxx/PolyData/MiscPointData
Description¶
This demo attaches a vector (in this case a float vector of length 1) to each point in a polydata.
Code¶
MiscPointData.cxx
#include <vtkCellData.h> #include <vtkDoubleArray.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkPointData.h> #include <vtkSmartPointer.h> #include <vtkXMLPolyDataReader.h> #include <vtkPolyDataNormals.h> #include <vtkFloatArray.h> #include <vtkMath.h> #include <string> int main(int argc, char *argv[]) { // Parse command line arguments if(argc != 2) { std::cout << "Required arguments: Filename" << std::endl; return EXIT_FAILURE; } // Get filename from command line std::string filename = argv[1]; //first command line argument // Read the file vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); std::cout << "Reading " << filename << std::endl; reader->SetFileName(filename.c_str()); reader->Update(); // Extract the polydata vtkSmartPointer<vtkPolyData> polydata = reader->GetOutput(); // Get the number of points in the polydata vtkIdType idNumPointsInFile = polydata->GetNumberOfPoints(); // Add distances to each point vtkSmartPointer<vtkFloatArray> distances = vtkSmartPointer<vtkFloatArray>::New(); distances->SetNumberOfComponents(1); distances->SetName("Distances"); for (vtkIdType i = 0; i < idNumPointsInFile; i++) { distances->InsertNextValue(vtkMath::Random(0.0,1.0)); } polydata->GetPointData()->AddArray(distances); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(MiscPointData) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(MiscPointData MACOSX_BUNDLE MiscPointData.cxx) target_link_libraries(MiscPointData ${VTK_LIBRARIES})
Download and Build MiscPointData¶
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 Some tarballs may be missing or out-of-date.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 MiscPointData and its CMakeLists.txt file. Once the tarball MiscPointData.tar has been downloaded and extracted,
cd MiscPointData/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:
./MiscPointData
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.