StripFran

Description¶

Triangle strip examples. Left, structured triangle mesh consisting of 134 strips each of 390 triangles. Right, Unstructured triangle mesh consisting of 2227 strips of average length 3.94, longest strip 101 triangles. Images are generated by displaying every other triangle strip.

Info

See Figure 9-21 in Chapter 9 The VTK Textbook.

Other languages

See (Python)

Question

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

Code¶

StripFran.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkDecimatePro.h>
#include <vtkMaskPolyData.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkPolyDataNormals.h>
#include <vtkPolyDataReader.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkStripper.h>

int main(int argc, char* argv[])
{
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " fran_cut.vtk" << std::endl;
    return EXIT_FAILURE;
  }
  // Create the RenderWindow, Renderer and both Actors
  //
  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkRenderer> renderer1;
  renderer1->SetViewport(0., 0., 0.5, 1.);

  vtkNew<vtkRenderer> renderer2;
  renderer2->SetViewport(0.5, 0., 1., 1.);

  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer1);
  renderWindow->AddRenderer(renderer2);
  renderWindow->SetWindowName("StripFran");

  vtkNew<vtkRenderWindowInteractor> interactor;
  interactor->SetRenderWindow(renderWindow);

  // create a cyberware source
  //
  vtkNew<vtkPolyDataReader> cyber;
  cyber->SetFileName(argv[1]);

  vtkNew<vtkDecimatePro> deci;
  deci->SetInputConnection(cyber->GetOutputPort());
  deci->SetTargetReduction(0.7);
  deci->PreserveTopologyOn();

  vtkNew<vtkPolyDataNormals> normals;
  normals->SetInputConnection(deci->GetOutputPort());

  vtkNew<vtkMaskPolyData> mask;
  mask->SetInputConnection(deci->GetOutputPort());
  mask->SetOnRatio(2);

  vtkNew<vtkPolyDataMapper> cyberMapper;
  cyberMapper->SetInputConnection(mask->GetOutputPort());

  vtkNew<vtkActor> cyberActor;
  cyberActor->SetMapper(cyberMapper);
  cyberActor->GetProperty()->SetColor(colors->GetColor3d("Flesh").GetData());

  vtkNew<vtkStripper> stripper;
  stripper->SetInputConnection(cyber->GetOutputPort());

  vtkNew<vtkMaskPolyData> stripperMask;
  stripperMask->SetInputConnection(stripper->GetOutputPort());
  stripperMask->SetOnRatio(2);

  vtkNew<vtkPolyDataMapper> stripperMapper;
  stripperMapper->SetInputConnection(stripperMask->GetOutputPort());

  vtkNew<vtkActor> stripperActor;
  stripperActor->SetMapper(stripperMapper);
  stripperActor->GetProperty()->SetColor(colors->GetColor3d("Flesh").GetData());

  // Add the actors to the renderer, set the background and size
  //
  renderer1->AddActor(stripperActor);
  renderer2->AddActor(cyberActor);
  renderer1->SetBackground(colors->GetColor3d("Wheat").GetData());
  renderer2->SetBackground(colors->GetColor3d("Papaya_Whip").GetData());
  renderWindow->SetSize(1024, 640);

  // render the image
  //
  vtkNew<vtkCamera> cam1;
  cam1->SetFocalPoint(0, 0, 0);
  cam1->SetPosition(1, 0, 0);
  cam1->SetViewUp(0, 1, 0);
  renderer1->SetActiveCamera(cam1);
  renderer2->SetActiveCamera(cam1);
  renderer1->ResetCamera();
  cam1->Azimuth(30);
  cam1->Elevation(30);
  cam1->Dolly(1.4);
  renderer1->ResetCameraClippingRange();

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

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(StripFran)

find_package(VTK COMPONENTS 
)

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

Download and Build StripFran¶

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

cd StripFran/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:

./StripFran

WINDOWS USERS

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