BoundaryEdges

VTKExamples/Cxx/Meshes/BoundaryEdges


Description

This filter will extract the boundary edges of a mesh. The original mesh is shown with the feature edges shown in red.

Other Languages

See (Python), (Java), (CSharp)

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

BoundaryEdges.cxx

#include <vtkSmartPointer.h>
#include <vtkFeatureEdges.h>
#include <vtkPolyData.h>
#include <vtkDiskSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

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

  vtkSmartPointer<vtkFeatureEdges> featureEdges =
    vtkSmartPointer<vtkFeatureEdges>::New();
  featureEdges->SetInputConnection(diskSource->GetOutputPort());
  featureEdges->BoundaryEdgesOn();
  featureEdges->FeatureEdgesOff();
  featureEdges->ManifoldEdgesOff();
  featureEdges->NonManifoldEdgesOff();
  featureEdges->Update();

  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> edgeMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  edgeMapper->SetInputConnection(featureEdges->GetOutputPort());
  vtkSmartPointer<vtkActor> edgeActor =
    vtkSmartPointer<vtkActor>::New();
  edgeActor->SetMapper(edgeMapper);

  vtkSmartPointer<vtkPolyDataMapper> diskMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  diskMapper->SetInputConnection(diskSource->GetOutputPort());
  vtkSmartPointer<vtkActor> diskActor =
    vtkSmartPointer<vtkActor>::New();
  diskActor->SetMapper(diskMapper);

  // Create a renderer, render window, and interactor
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(edgeActor);
  renderer->AddActor(diskActor);
  renderer->SetBackground(.3, .6, .3); // Background color green

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BoundaryEdges)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping BoundaryEdges: ${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(BoundaryEdges MACOSX_BUNDLE BoundaryEdges.cxx )
  target_link_libraries(BoundaryEdges PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(BoundaryEdges MACOSX_BUNDLE BoundaryEdges.cxx )
  target_link_libraries(BoundaryEdges PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS BoundaryEdges
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build BoundaryEdges

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

cd BoundaryEdges/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:

./BoundaryEdges

WINDOWS USERS

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