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AddCell

vtk-examples/Cxx/Meshes/AddCell

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Question

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Code

AddCell.cxx

#include <vtkCellArray.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkTriangle.h>

int main(int, char*[])
{
  // Create a triangle
  vtkNew<vtkPoints> points;
  points->InsertNextPoint(1.0, 0.0, 0.0);
  points->InsertNextPoint(0.0, 0.0, 0.0);
  points->InsertNextPoint(0.0, 1.0, 0.0);

  vtkNew<vtkTriangle> triangle;
  triangle->GetPointIds()->SetId(0, 0);
  triangle->GetPointIds()->SetId(1, 1);
  triangle->GetPointIds()->SetId(2, 2);

  vtkNew<vtkCellArray> triangles;
  triangles->InsertNextCell(triangle);

  // Create a polydata object
  vtkNew<vtkPolyData> polyData;

  // Add the geometry and topology to the polydata
  polyData->SetPoints(points);
  polyData->SetPolys(triangles);

  std::cout << "There are " << polyData->GetNumberOfCells() << " cells."
            << std::endl;

  polyData->GetPolys()->InsertNextCell(triangle);

  std::cout << "There are " << polyData->GetNumberOfCells() << " cells."
            << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(AddCell)

find_package(VTK COMPONENTS 
  CommonCore
  CommonDataModel
  QUIET
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "AddCell: 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(AddCell MACOSX_BUNDLE AddCell.cxx )
  target_link_libraries(AddCell PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS AddCell
  MODULES ${VTK_LIBRARIES}
)

Download and Build AddCell

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

cd AddCell/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:

./AddCell

WINDOWS USERS

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