# LinearExtrusion

VTKExamples/Cxx/PolyData/LinearExtrusion

### Description

This example creates some text, extrudes it to make it 3D.

### Code

LinearExtrusion.cxx

    #include <vtkSmartPointer.h>
    #include <vtkVectorText.h>
    #include <vtkLinearExtrusionFilter.h>
    #include <vtkTriangleFilter.h>

    #include <vtkDataSetMapper.h>
    #include <vtkActor.h>
    #include <vtkProperty.h>
    #include <vtkCamera.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      // Create vector text
      vtkSmartPointer<vtkVectorText> vecText =
        vtkSmartPointer<vtkVectorText>::New();
      vecText->SetText("Text!");

      // Apply linear extrusion
      vtkSmartPointer<vtkLinearExtrusionFilter> extrude =
        vtkSmartPointer<vtkLinearExtrusionFilter>::New();
      extrude->SetInputConnection( vecText->GetOutputPort());
      extrude->SetExtrusionTypeToNormalExtrusion();
      extrude->SetVector(0, 0, 1 );
      extrude->SetScaleFactor (0.5);

      vtkSmartPointer<vtkTriangleFilter> triangleFilter =
        vtkSmartPointer<vtkTriangleFilter>::New();
      triangleFilter->SetInputConnection(extrude->GetOutputPort());

      vtkSmartPointer<vtkDataSetMapper> mapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      mapper->SetInputConnection(triangleFilter->GetOutputPort());

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);
      actor->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);

      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();

      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      renderer->SetBackground(.4, .5, .7);

      renderWindow->AddRenderer(renderer);

      renderer->AddActor(actor);

      renderer->ResetCamera();
        // Generate an interesting view
      renderer->ResetCamera();
      renderer->GetActiveCamera()->Azimuth(30);
      renderer->GetActiveCamera()->Elevation(30);
      renderer->GetActiveCamera()->Dolly(1.0);
      renderer->ResetCameraClippingRange();

      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(LinearExtrusion)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkFiltersCore
      vtkFiltersModeling
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping LinearExtrusion: ${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(LinearExtrusion MACOSX_BUNDLE LinearExtrusion.cxx )
      target_link_libraries(LinearExtrusion PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(LinearExtrusion MACOSX_BUNDLE LinearExtrusion.cxx )
      target_link_libraries(LinearExtrusion PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS LinearExtrusion
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build LinearExtrusion

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

    cd LinearExtrusion/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:

    ./LinearExtrusion

WINDOWS USERS

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