VTK/ExamplesBoneYard/TriangleOnData

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VTK Examples Baseline GeometricObjectsDisplay TestDisplayTriangle.png

DisplayTriangle.cxx

#include <vtkSmartPointer.h>
#include <vtkTriangle.h>
#include <vtkCellArray.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

int main(int , char *[])
{
  //Create a triangle
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint ( 1.0, 0.0, 0.0 );
  points->InsertNextPoint ( 0.0, 0.0, 0.0 );
  points->InsertNextPoint ( 0.0, 1.0, 0.0 );
  
  vtkSmartPointer<vtkTriangle> triangle =
    vtkSmartPointer<vtkTriangle>::New();
  triangle->GetPointIds()->SetId ( 0, 0 );
  triangle->GetPointIds()->SetId ( 1, 1 );
  triangle->GetPointIds()->SetId ( 2, 2 );
  
  vtkSmartPointer<vtkCellArray> triangles =
    vtkSmartPointer<vtkCellArray>::New();
  triangles->InsertNextCell ( triangle );
  
  //Create a polydata object
  vtkSmartPointer<vtkPolyData> trianglePolyData =
    vtkSmartPointer<vtkPolyData>::New();

  //Add the geometry and topology to the polydata
  trianglePolyData->SetPoints ( points );
  trianglePolyData->SetPolys ( triangles );
  
  //Create mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInput(trianglePolyData);

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  //Create a renderer, render window, and an 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);

  //Add the actors to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(.1, .2, .4); // Background color dark blue

  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(TriangleOnData)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(TriangleOnData MACOSX_BUNDLE TriangleOnData.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(TriangleOnData ${VTK_LIBRARIES})
else()
  target_link_libraries(TriangleOnData vtkHybrid vtkWidgets)
endif()

Download and Build TriangleOnData

Click here to download TriangleOnData. and its CMakeLists.txt file.

Once the tarball TriangleOnData.tar has been downloaded and extracted,

cd TriangleOnData/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:

./TriangleOnData

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