VTK/Examples/Cxx/GeometricObjects/Frustum

This example gets the frustum from a camera and displays it on the screen.

Frustum.cxx

#include <vtkVersion.h>
#include <vtkFrustumSource.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkCamera.h>
#include <vtkPlanes.h>
#include <vtkMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyDataMapper.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkCamera> camera =
    vtkSmartPointer<vtkCamera>::New();
  double planesArray[24];
  
  camera->GetFrustumPlanes(1, planesArray);
  
  vtkSmartPointer<vtkPlanes> planes =
    vtkSmartPointer<vtkPlanes>::New();
  planes->SetFrustumPlanes(planesArray);
  
  vtkSmartPointer<vtkFrustumSource> frustumSource =
    vtkSmartPointer<vtkFrustumSource>::New();
  frustumSource->ShowLinesOff();
  frustumSource->SetPlanes(planes);
  frustumSource->Update();

  vtkPolyData* frustum = frustumSource->GetOutput();

  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  mapper->SetInput(frustum);
#else
  mapper->SetInputData(frustum);
#endif

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  
  // a renderer and render window
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  // an interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // add the actors to the scene
  renderer->AddActor(actor);
  renderer->SetBackground( .2, .1, .3); // Background color dark purple

  // render an image (lights and cameras are created automatically)
  renderWindow->Render();

  // begin mouse interaction
  renderWindowInteractor->Start();
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(Frustum)

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

add_executable(Frustum MACOSX_BUNDLE Frustum.cxx)

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

Download and Build Frustum

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

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

cd Frustum/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:

./Frustum

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.