MultipleRenderWindows

VTKEx/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 simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

MultipleRenderWindows.cxx

#include <vtkSmartPointer.h>

#include <vtkActor.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.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++)
  {
    vtkSmartPointer<vtkRenderWindow> renderWindow =
      vtkSmartPointer<vtkRenderWindow>::New();

    vtkSmartPointer<vtkRenderer> renderer =
      vtkSmartPointer<vtkRenderer>::New();

    renderWindow->AddRenderer(renderer);

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
      vtkSmartPointer<vtkRenderWindowInteractor>::New();

    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
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->SetCenter(0.0, 0.0, 0.0);
    sphereSource->SetRadius(5.0);
    sphereSource->Update();

    //Create a mapper and actor
    vtkSmartPointer<vtkPolyDataMapper> mapper =
      vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(sphereSource->GetOutputPort());

    vtkSmartPointer<vtkActor> actor =
      vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);
    renderer->AddActor(actor);
    renderer->ResetCamera();
  }

  interactors[3]->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(MultipleRenderWindows)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersSources
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 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.