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
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.