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# RenderWindowNoUiFile

VTKEx/Cxx/Qt/RenderWindowNoUiFile

### Description

This is a very basic example that shows how to create a Qt window. Typically, one would want to design a form in the QtDesigner (this is shown in RenderWindowUi)

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

RenderWindowNoUiFile.cxx

    #include <QApplication>

    #include <vtkActor.h>
    #include <vtkGenericOpenGLRenderWindow.h>
    #include <vtkNamedColors.h>
    #include <vtkNew.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkSphereSource.h>
    #include <vtkVersion.h>

    #if VTK_VERSION_NUMBER >= 89000000000ULL
    #define VTK890 1
    #endif

    #include <QSurfaceFormat>
    #include <QVTKOpenGLNativeWidget.h>

    int main(int argc, char** argv)
    {
      // needed to ensure appropriate OpenGL context is created for VTK rendering.
      QSurfaceFormat::setDefaultFormat(QVTKOpenGLNativeWidget::defaultFormat());

      QApplication app(argc, argv);

      QVTKOpenGLNativeWidget widget;

      vtkNew<vtkNamedColors> colors;

      vtkNew<vtkGenericOpenGLRenderWindow> renderWindow;
    #if VTK890
      widget.setRenderWindow(renderWindow);
    #else
      widget.SetRenderWindow(renderWindow);
    #endif

      widget.resize(600, 600);

      vtkNew<vtkSphereSource> sphereSource;

      vtkNew<vtkPolyDataMapper> sphereMapper;
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());

      vtkNew<vtkActor> sphereActor;
      sphereActor->SetMapper(sphereMapper);
      sphereActor->GetProperty()->SetColor(colors->GetColor4d("Tomato").GetData());

      vtkNew<vtkRenderer> renderer;
      renderer->AddActor(sphereActor);
      renderer->SetBackground(colors->GetColor3d("SteelBlue").GetData());

    #if VTK890
      widget.renderWindow()->AddRenderer(renderer);
      widget.renderWindow()->SetWindowName("RenderWindowNoUIFile");
    #else
      widget.GetRenderWindow()->AddRenderer(renderer);
      widget.GetRenderWindow()->SetWindowName("RenderWindowNoUIFile");
    #endif
      widget.show();

      app.exec();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(RenderWindowNoUiFile)

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

### Download and Build RenderWindowNoUiFile

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

    cd RenderWindowNoUiFile/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:

    ./RenderWindowNoUiFile

WINDOWS USERS

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