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MultipleRenderWindows

vtk-examples/Cxx/Visualization/MultipleRenderWindows


Description

This example creates 4 render windows. When you close one, the next one opens? Or do they all open simultaneously?

Question

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

Code

MultipleRenderWindows.cxx

#include <vtkActor.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 <sstream>
#include <vector>

int main(int, char*[])
{
  std::vector<vtkSmartPointer<vtkRenderWindowInteractor>> interactors;

  for (unsigned int i = 0; i < 4; i++)
  {
    vtkNew<vtkNamedColors> colors;

    vtkNew<vtkRenderWindow> renderWindow;

    vtkNew<vtkRenderer> renderer;

    renderWindow->AddRenderer(renderer);

    vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;

    interactors.push_back(renderWindowInteractor);

    renderWindowInteractor->SetRenderWindow(renderWindow);
    renderWindow->Render();
    std::stringstream ss;
    ss << "Window " << i;
    renderWindow->SetWindowName(ss.str().c_str());
    renderWindow->SetPosition(i * 300, 0);

    // create a sphere
    vtkNew<vtkSphereSource> sphereSource;
    sphereSource->SetCenter(0.0, 0.0, 0.0);
    sphereSource->SetRadius(5.0);
    sphereSource->Update();

    // Create a mapper and actor
    vtkNew<vtkPolyDataMapper> mapper;
    mapper->SetInputConnection(sphereSource->GetOutputPort());

    vtkNew<vtkActor> actor;
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

    renderer->AddActor(actor);
    renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

    renderer->ResetCamera();
  }

  interactors[3]->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(MultipleRenderWindows)

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

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

Download and Build MultipleRenderWindows

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

cd MultipleRenderWindows/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:

./MultipleRenderWindows

WINDOWS USERS

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