VTK/Examples/Cxx/PolyData/AttachAttributes

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AttachAttributes.cxx

// vtk includes
#include <vtkDoubleArray.h>
#include <vtkInformation.h>
#include <vtkInformationDoubleVectorKey.h>

// std includes
#include <iostream>

int main(int, char *[]) {

  // create a 2-element array
  vtkDoubleArray* array = vtkDoubleArray::New();
  array->SetName("array");
  array->SetNumberOfComponents(1);
  array->SetNumberOfTuples(2);
  array->SetValue(0, 1.);
  array->SetValue(1, 2.);

  // access the info (presently none stored)
  vtkInformation* info = array->GetInformation();

  // add one attribute, a double vector
  const char *name = "myKey";
  const char *location = "MyClass"; // 
  const int length = 3;
  vtkInformationDoubleVectorKey *key = new vtkInformationDoubleVectorKey(name, 
                                                                         location, 
                                                                         length);
  double values[] = {0.1, 0.2, 0.3};
  info->Set(key, values[0], values[1],values[2]);

  // extract the key
  double *vals = info->Get(key);
  std::cout << "extracted values are: " << vals[0] << ", " << vals[1] << ", " << vals[2] << '\n';
  array->Delete();
  // array->Delete will also delete key (do not call delete key)

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(AttachAttributes)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(AttachAttributes MACOSX_BUNDLE AttachAttributes.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(AttachAttributes ${VTK_LIBRARIES})
else()
  target_link_libraries(AttachAttributes vtkHybrid vtkWidgets)
endif()

Download and Build AttachAttributes

Click here to download AttachAttributes. and its CMakeLists.txt file.

Once the tarball AttachAttributes.tar has been downloaded and extracted,

cd AttachAttributes/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:

./AttachAttributes

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.