GetMiscPointData
VTKExamples/Cxx/PolyData/GetMiscPointData
Description¶
This example demonstrates how to get data stored at each point in a polydata.
Code¶
GetMiscPointData.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 <string> int main(int argc, char *argv[]) { // Parse command line arguments if(argc != 3) { std::cout << "Required arguments: Filename ArrayName" << std::endl; return EXIT_FAILURE; } // Get filename from command line std::string filename = argv[1]; //first command line argument // Get array name std::string arrayName = argv[2]; //second 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(); vtkSmartPointer<vtkDoubleArray> array = vtkDoubleArray::SafeDownCast(polydata->GetPointData()->GetArray(arrayName.c_str())); if(array) { std::cout << "Got array " << arrayName << " with " << idNumPointsInFile << " values" << std::endl; for(int i = 0; i < idNumPointsInFile; i++) { double value; value = array->GetValue(i); std::cout << i << ": " << value << std::endl; } } else { std::cout << "The file " << filename << " does not have a PointData array named " << arrayName << std::endl; } return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(GetMiscPointData) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(GetMiscPointData MACOSX_BUNDLE GetMiscPointData.cxx) target_link_libraries(GetMiscPointData ${VTK_LIBRARIES})
Download and Build GetMiscPointData¶
Danger
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Click here to download GetMiscPointData and its CMakeLists.txt file. Once the tarball GetMiscPointData.tar has been downloaded and extracted,
cd GetMiscPointData/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:
./GetMiscPointData
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.