# PerlinNoise

VTKExamples/Cxx/Filtering/PerlinNoise

Other Languages

See (Python), (Java)

### Code

PerlinNoise.cxx

    #include <vtkSmartPointer.h>

    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkSampleFunction.h>
    #include <vtkContourFilter.h>
    #include <vtkProperty.h>
    #include <vtkCamera.h>

    #include <vtkPerlinNoise.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkPerlinNoise> perlinNoise =
        vtkSmartPointer<vtkPerlinNoise>::New();
      perlinNoise->SetFrequency(2, 1.25, 1.5);
      perlinNoise->SetPhase(0, 0, 0);

      vtkSmartPointer<vtkSampleFunction> sample =
        vtkSmartPointer<vtkSampleFunction>::New();
      sample->SetImplicitFunction(perlinNoise);
      sample->SetSampleDimensions(65, 65, 20);
      sample->ComputeNormalsOff();

      vtkSmartPointer<vtkContourFilter> surface =
        vtkSmartPointer<vtkContourFilter>::New();
      surface->SetInputConnection(sample->GetOutputPort());
      surface->SetValue(0, 0.0);

      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(surface->GetOutputPort());
      mapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);
      actor->GetProperty()->SetColor(0.2, 0.4, 0.6);

      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> interactor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      interactor->SetRenderWindow(renderWindow);

      // Add the actors to the renderer, set the background and size

      renderer->AddActor(actor);
      renderer->SetBackground(1, 1, 1);
      renderWindow->SetSize(300, 300);
      renderer->ResetCamera();
      renderWindow->Render();
      interactor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(PerlinNoise)

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

### Download and Build PerlinNoise

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

    cd PerlinNoise/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:

    ./PerlinNoise

WINDOWS USERS

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