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StripFran

vtk-examples/Cxx/Rendering/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.

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 
  CommonColor
  CommonCore
  FiltersCore
  IOLegacy
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

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.