Triangulate

VTKExamples/Cxx/Meshes/Triangulate


Other Languages

See (CSharp)

Question

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Code

Triangulate.cxx

#include <vtkSmartPointer.h>
#include <vtkProperty.h>
#include <vtkPolyData.h>
#include <vtkTriangleFilter.h>
#include <vtkRegularPolygonSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkRegularPolygonSource> polygonSource =
    vtkSmartPointer<vtkRegularPolygonSource>::New();
  polygonSource->Update();

  vtkSmartPointer<vtkTriangleFilter> triangleFilter =
    vtkSmartPointer<vtkTriangleFilter>::New();
  triangleFilter->SetInputConnection(polygonSource->GetOutputPort());
  triangleFilter->Update();

  vtkSmartPointer<vtkPolyDataMapper> inputMapper =
      vtkSmartPointer<vtkPolyDataMapper>::New();
  inputMapper->SetInputConnection(polygonSource->GetOutputPort());
  vtkSmartPointer<vtkActor> inputActor =
      vtkSmartPointer<vtkActor>::New();
  inputActor->SetMapper(inputMapper);
  inputActor->GetProperty()->SetRepresentationToWireframe();

  vtkSmartPointer<vtkPolyDataMapper> triangleMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  triangleMapper->SetInputConnection(triangleFilter->GetOutputPort());
  vtkSmartPointer<vtkActor> triangleActor =
      vtkSmartPointer<vtkActor>::New();
  triangleActor->SetMapper(triangleMapper);
  triangleActor->GetProperty()->SetRepresentationToWireframe();

  // There will be one render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);

  // And one interactor
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};

  // Setup both renderers
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->SetBackground(.6, .5, .4);

  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->SetBackground(.4, .5, .6);

  leftRenderer->AddActor(inputActor);
  rightRenderer->AddActor(triangleActor);

  leftRenderer->ResetCamera();

  rightRenderer->ResetCamera();

  renderWindow->Render();
  interactor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Triangulate)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping Triangulate: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(Triangulate MACOSX_BUNDLE Triangulate.cxx )
  target_link_libraries(Triangulate PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(Triangulate MACOSX_BUNDLE Triangulate.cxx )
  target_link_libraries(Triangulate PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS Triangulate
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build Triangulate

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

cd Triangulate/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:

./Triangulate

WINDOWS USERS

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