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VectorArrayKnownLength

vtk-examples/Cxx/Utilities/VectorArrayKnownLength

Description

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

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

VectorArrayKnownLength.cxx

#include <vtkFloatArray.h>
#include <vtkNew.h>

int main(int, char*[])
{
  vtkNew<vtkFloatArray> distances;
  distances->SetName("Distances");
  distances->SetNumberOfComponents(3);
  distances->SetNumberOfTuples(5);

  // set values
  for (vtkIdType i = 0; i < distances->GetNumberOfTuples(); i++)
  {
    float tuple[3];
    tuple[0] = (float)i + 0.1;
    tuple[1] = (float)i + 0.2;
    tuple[2] = (float)i + 0.3;
    distances->SetTuple(i, 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;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(VectorArrayKnownLength)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "VectorArrayKnownLength: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(VectorArrayKnownLength MACOSX_BUNDLE VectorArrayKnownLength.cxx )
  target_link_libraries(VectorArrayKnownLength PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS VectorArrayKnownLength
  MODULES ${VTK_LIBRARIES}
)

Download and Build VectorArrayKnownLength

Click here to download VectorArrayKnownLength and its CMakeLists.txt file. Once the tarball VectorArrayKnownLength.tar has been downloaded and extracted,

cd VectorArrayKnownLength/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:

./VectorArrayKnownLength

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.