VTK/Examples/Cxx/Utilities/VectorArrayUnknownLength

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This example creates a VTK style float array of vectors. This can be easily interchanged with vtkIntArray, vtkDoubleArray, etc.

The only difference between this example and the KnownLengthArrayOfVectors example is that SetNumberOfValues() is not called, and SetTuple() is replaced by InsertNextTuple().

VectorArrayUnknownLength.cxx

#include <vtkSmartPointer.h>
#include <vtkFloatArray.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkFloatArray> distances =
    vtkSmartPointer<vtkFloatArray>::New();
  distances->SetName("Distances");
  distances->SetNumberOfComponents(3);

  //set values
  for(vtkIdType i = 0; i < 5; i++)
    {
    float tuple[3];
    tuple[0] = (float)i + 0.1;
    tuple[1] = (float)i + 0.2;
    tuple[2] = (float)i + 0.3;
    //this will allocate memory as necessary
    distances->InsertNextTuple(tuple);
    }

  //get values
  for(vtkIdType i = 0; i < distances->GetNumberOfTuples(); i++)
    {
    double d[3];
    distances->GetTuple(i, d);
    std::cout << d[0] << " " << d[1] << " " << d[2] << std::endl;
    }

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(VectorArrayUnknownLength)

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

add_executable(VectorArrayUnknownLength MACOSX_BUNDLE VectorArrayUnknownLength.cxx)

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

Download and Build VectorArrayUnknownLength

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

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

cd VectorArrayUnknownLength/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:

./VectorArrayUnknownLength

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.