OpenVRFrustm

VTKEx/Cxx/GeometricObjects/OpenVRFrustm

VTK + OpenVR Frustrum Example

Question

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Code

OpenVRFrustm.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkFrustumSource.h>
#include <vtkMapper.h>
#include <vtkNamedColors.h>
#include <vtkPlanes.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkOpenVRRenderWindow.h>
#include <vtkOpenVRRenderer.h>
#include <vtkOpenVRRenderWindowInteractor.h>
#include <vtkShrinkPolyData.h>
#include <vtkSmartPointer.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkCamera> camera =
    vtkSmartPointer<vtkCamera>::New();
  camera->SetClippingRange(.1, .4);
  double planesArray[24];

  camera->GetFrustumPlanes(1.0, planesArray);

  vtkSmartPointer<vtkPlanes> planes =
    vtkSmartPointer<vtkPlanes>::New();
  planes->SetFrustumPlanes(planesArray);

  vtkSmartPointer<vtkFrustumSource> frustumSource =
    vtkSmartPointer<vtkFrustumSource>::New();
  frustumSource->ShowLinesOff();
  frustumSource->SetPlanes(planes);

  vtkSmartPointer<vtkShrinkPolyData> shrink =
    vtkSmartPointer<vtkShrinkPolyData>::New();
  shrink->SetInputConnection(frustumSource->GetOutputPort());
  shrink->SetShrinkFactor(.9);

  // Create a mapper and actor

  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(shrink->GetOutputPort());

  vtkSmartPointer<vtkProperty> back =
    vtkSmartPointer<vtkProperty>::New();
  back->SetColor(colors->GetColor3d("Tomato").GetData());

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->EdgeVisibilityOn();
  actor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
  actor->SetBackfaceProperty(back);

  // Create a renderer, render window, and interactor
  vtkSmartPointer<vtkOpenVRRenderer> renderer =
    vtkSmartPointer<vtkOpenVRRenderer>::New();
  vtkSmartPointer<vtkOpenVRRenderWindow> renderWindow =
    vtkSmartPointer<vtkOpenVRRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkOpenVRRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkOpenVRRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actors to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("Silver").GetData());

  // Position the camera so that we can see the frustum
  renderer->GetActiveCamera()->SetPosition(1, 0, 0);
  renderer->GetActiveCamera()->SetFocalPoint(0, 0, 0);
  renderer->GetActiveCamera()->SetViewUp(0, 1, 0);
  renderer->GetActiveCamera()->Azimuth(30);
  renderer->GetActiveCamera()->Elevation(30);
  renderer->ResetCamera();
  renderWindow->Render();
  renderWindowInteractor->Start();
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(OpenVRFrustm)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersGeneral
  vtkvtkFiltersSources
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2
  vtkvtkRenderingOpenVR QUIET)
if (NOT VTK_FOUND)
  message("Skipping OpenVRFrustm: ${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(OpenVRFrustm MACOSX_BUNDLE OpenVRFrustm.cxx )
  target_link_libraries(OpenVRFrustm PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(OpenVRFrustm MACOSX_BUNDLE OpenVRFrustm.cxx )
  target_link_libraries(OpenVRFrustm PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS OpenVRFrustm
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build OpenVRFrustm

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

cd OpenVRFrustm/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:

./OpenVRFrustm

WINDOWS USERS

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