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# Morph3D

VTKEx/Cxx/Visualization/Morph3D

### Description

This example uses vtkInterpolateDataSetAttributes to interpolate datasets created using vtkImplicitModeller. Then vtkContourFilter extracts the resulting isosurface. An animation loop of 100 steps shows each interpolated isosurface with a 100 millisecond delay between each frame.

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

Morph3D.cxx

    #include <vtkCamera.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkActor.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkContourFilter.h>
    #include <vtkInterpolateDataSetAttributes.h>
    #include <vtkImplicitModeller.h>
    #include <vtkVectorText.h>
    #include <vtkProperty.h>

    #include <vtkNamedColors.h>
    #include <vtksys/SystemTools.hxx>

    int main (int argc, char *argv[])
    {
      double t = 2.0;
      if (argc > 1)
      {
        t = atof(argv[1]);
      }

    // make the letter v
      vtkSmartPointer<vtkVectorText> letterV =
        vtkSmartPointer<vtkVectorText>::New();
      letterV->SetText("v");

    // read the geometry file containing the letter t
      vtkSmartPointer<vtkVectorText> letterT =
        vtkSmartPointer<vtkVectorText>::New();
      letterT->SetText("t");

    // read the geometry file containing the letter k
      vtkSmartPointer<vtkVectorText> letterK =
        vtkSmartPointer<vtkVectorText>::New();
      letterK->SetText("k");

    // create implicit models of each letter
      vtkSmartPointer<vtkImplicitModeller> blobbyV =
        vtkSmartPointer<vtkImplicitModeller>::New();
      blobbyV->SetInputConnection(letterV->GetOutputPort());
      blobbyV->SetMaximumDistance(.2);
      blobbyV->SetSampleDimensions(50, 50, 12);
      blobbyV->SetModelBounds(-0.5, 1.5, -0.5, 1.5, -0.5, 0.5);

      vtkSmartPointer<vtkImplicitModeller> blobbyT =
        vtkSmartPointer<vtkImplicitModeller>::New();
      blobbyT->SetInputConnection(letterT->GetOutputPort());
      blobbyT->SetMaximumDistance(.2);
      blobbyT->SetSampleDimensions(50, 50, 12);
      blobbyT->SetModelBounds(-0.5, 1.5, -0.5, 1.5, -0.5, 0.5);

      vtkSmartPointer<vtkImplicitModeller> blobbyK =
        vtkSmartPointer<vtkImplicitModeller>::New();
      blobbyK->SetInputConnection(letterK->GetOutputPort());
      blobbyK->SetMaximumDistance(.2);
      blobbyK->SetSampleDimensions(50, 50, 12);
      blobbyK->SetModelBounds(-0.5, 1.5, -0.5, 1.5, -0.5, 0.5);

    // Interpolate the data
      vtkSmartPointer<vtkInterpolateDataSetAttributes> interpolate =
        vtkSmartPointer<vtkInterpolateDataSetAttributes>::New();
      interpolate->AddInputConnection(blobbyV->GetOutputPort());
      interpolate->AddInputConnection(blobbyT->GetOutputPort());
      interpolate->AddInputConnection(blobbyK->GetOutputPort());
      interpolate->SetT(0.0);

    // extract an iso surface
      vtkSmartPointer<vtkContourFilter> blobbyIso =
        vtkSmartPointer<vtkContourFilter>::New();
      blobbyIso->SetInputConnection(interpolate->GetOutputPort());
      blobbyIso->SetValue(0, 0.1);

    // map to rendering primitives
      vtkSmartPointer<vtkPolyDataMapper> blobbyMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      blobbyMapper->SetInputConnection(blobbyIso->GetOutputPort());
      blobbyMapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

    // now an actor
      vtkSmartPointer<vtkActor> blobby =
        vtkSmartPointer<vtkActor>::New();
      blobby->SetMapper(blobbyMapper);
      blobby->GetProperty()->SetDiffuseColor(colors->GetColor3d("Banana").GetData());
      blobby->GetProperty()->EdgeVisibilityOn();

    // Create the RenderWindow, Renderer and both Actors
    //
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> interactor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      interactor->SetRenderWindow(renderWindow);

      vtkSmartPointer<vtkCamera> camera =
        vtkSmartPointer<vtkCamera>::New();
      camera->SetClippingRange(0.265,13.2);
      camera->SetFocalPoint(0.539, 0.47464, 0);
      camera->SetPosition(0.539, 0.474674, 2.644);
      camera->SetViewUp(0, 1, 0);
      camera->Azimuth(30.);
      camera->Elevation(30.);
      renderer->SetActiveCamera(camera);

    //  now  make a renderer and tell it about lights and actors
      renderWindow->SetSize(640,480);

      renderer->AddActor(blobby);
      renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
      renderWindow->Render();
      for (unsigned i = 0; i < 100; ++i)
      {
        interpolate->SetT(i / 99.0 * 2.0);
        interpolate->Modified();
        renderWindow->Render();
        vtksys::SystemTools::Delay(100);
      }
      interpolate->SetT(t);
      renderWindow->Render();

    // interact
      interactor->Start();
      return EXIT_SUCCESS;
      }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(Morph3D)

    find_package(VTK COMPONENTS
      vtkCommonColor
      vtkFiltersCore
      vtkFiltersGeneral
      vtkFiltersHybrid
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping Morph3D: ${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(Morph3D MACOSX_BUNDLE Morph3D.cxx )
      target_link_libraries(Morph3D PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(Morph3D MACOSX_BUNDLE Morph3D.cxx )
      target_link_libraries(Morph3D PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS Morph3D
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build Morph3D

Click here to download Morph3D and its CMakeLists.txt file. Once the tarball Morph3D.tar has been downloaded and extracted,

    cd Morph3D/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:

    ./Morph3D

WINDOWS USERS

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