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MultipleViewports

vtk-examples/Cxx/Visualization/MultipleViewports


Description

This example creates a window with 4 viewports. Updating the camera position in one viewport will also update the position in the other viewports.

See MultipleRenderWindows for an example using multiple windows.

Other languages

See (Python), (Java)

Question

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

Code

MultipleViewports.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkConeSource.h>
#include <vtkCubeSource.h>
#include <vtkCylinderSource.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>

#include <vector>

namespace {
std::vector<vtkSmartPointer<vtkPolyDataAlgorithm>> GetSources();
}

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkRenderWindow> renderWindow;

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;

  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Define viewport ranges.
  double xmins[4] = {0, .5, 0, .5};
  double xmaxs[4] = {0.5, 1, 0.5, 1};
  double ymins[4] = {0, 0, .5, .5};
  double ymaxs[4] = {0.5, 0.5, 1, 1};
  // Have some fun with colors.
  std::vector<std::string> renBkg{"AliceBlue", "GhostWhite", "WhiteSmoke",
                                  "Seashell"};
  std::vector<std::string> actorColor{"Bisque", "RosyBrown", "Goldenrod",
                                      "Chocolate"};
  vtkCamera* camera = nullptr;
  auto sources = GetSources();

  for (unsigned i = 0; i < 4; i++)
  {
    vtkNew<vtkRenderer> renderer;

    renderWindow->AddRenderer(renderer);
    renderer->SetViewport(xmins[i], ymins[i], xmaxs[i], ymaxs[i]);

    // Share the camera between viewports.
    if (i == 0)
    {
      camera = renderer->GetActiveCamera();
      camera->Azimuth(30);
      camera->Elevation(30);
    }
    else
    {
      renderer->SetActiveCamera(camera);
    }

    // Create a mapper and actor.
    vtkNew<vtkPolyDataMapper> mapper;
    mapper->SetInputConnection(sources[i]->GetOutputPort());
    vtkNew<vtkActor> actor;
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(colors->GetColor3d(actorColor[i]).GetData());

    renderer->AddActor(actor);
    renderer->SetBackground(colors->GetColor3d(renBkg[i]).GetData());

    renderer->ResetCamera();
  }
  renderWindow->Render();
  renderWindow->SetWindowName("MultipleViewPorts");
  renderWindow->SetSize(600, 600);

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

namespace {
std::vector<vtkSmartPointer<vtkPolyDataAlgorithm>> GetSources()
{
  std::vector<vtkSmartPointer<vtkPolyDataAlgorithm>> sources;
  for (unsigned i = 0; i < 4; i++)
  {
    // Create a sphere.
    vtkNew<vtkSphereSource> sphere;
    sphere->SetCenter(0.0, 0.0, 0.0);
    sphere->Update();
    sources.push_back(sphere);
    // Create a cone.
    vtkNew<vtkConeSource> cone;
    cone->SetCenter(0.0, 0.0, 0.0);
    cone->SetDirection(0, 1, 0);
    cone->Update();
    sources.push_back(cone);
    // Create a cube.
    vtkNew<vtkCubeSource> cube;
    cube->SetCenter(0.0, 0.0, 0.0);
    cube->Update();
    sources.push_back(cube);
    // Create a cylinder.
    vtkNew<vtkCylinderSource> cylinder;
    cylinder->SetCenter(0.0, 0.0, 0.0);
    cylinder->Update();
    sources.push_back(cylinder);
  }
  return sources;
}

} // namespace

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(MultipleViewports)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping MultipleViewports: ${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(MultipleViewports MACOSX_BUNDLE MultipleViewports.cxx )
  target_link_libraries(MultipleViewports PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(MultipleViewports MACOSX_BUNDLE MultipleViewports.cxx )
  target_link_libraries(MultipleViewports PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS MultipleViewports
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build MultipleViewports

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

cd MultipleViewports/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:

./MultipleViewports

WINDOWS USERS

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