# IceCream

VTKExamples/Cxx/VisualizationAlgorithms/IceCream

### Description

This example demonstrates how to use boolean combinations of implicit functions to create a model of an ice cream cone.

### Code

IceCream.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkCone.h>
    #include <vtkContourFilter.h>
    #include <vtkImplicitBoolean.h>
    #include <vtkNamedColors.h>
    #include <vtkPlane.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkSampleFunction.h>
    #include <vtkSphere.h>

    int main (int, char *[])
    {
    // This example demonstrates how to use boolean combinations of implicit
    // functions to create a model of an ice cream cone.

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

    // Create implicit function primitives. These have been carefully placed to
    // give the effect that we want. We are going to use various combinations of
    // these functions to create the shape we want; for example, we use planes
    // intersected with a cone (which is infinite in extent) to get a finite
    // cone.
    //
      vtkSmartPointer<vtkCone> cone =
        vtkSmartPointer<vtkCone>::New();
      cone->SetAngle(20);

      vtkSmartPointer<vtkPlane> vertPlane =
        vtkSmartPointer<vtkPlane>::New();
      vertPlane->SetOrigin(.1, 0, 0);
      vertPlane->SetNormal(-1, 0, 0);

      vtkSmartPointer<vtkPlane> basePlane =
        vtkSmartPointer<vtkPlane>::New();
      basePlane->SetOrigin(1.2, 0, 0);
      basePlane->SetNormal(1, 0, 0);

      vtkSmartPointer<vtkSphere> iceCream =
        vtkSmartPointer<vtkSphere>::New();
      iceCream->SetCenter(1.333, 0, 0);
      iceCream->SetRadius(0.5);

      vtkSmartPointer<vtkSphere> bite =
        vtkSmartPointer<vtkSphere>::New();
      bite->SetCenter(1.5, 0, 0.5);
      bite->SetRadius(0.25);

    // Combine primitives to build ice-cream cone. Clip the cone with planes.
      vtkSmartPointer<vtkImplicitBoolean> theCone =
        vtkSmartPointer<vtkImplicitBoolean>::New();
      theCone->SetOperationTypeToIntersection();
      theCone->AddFunction(cone);
      theCone->AddFunction(vertPlane);
      theCone->AddFunction(basePlane);

    // Take a bite out of the ice cream.
      vtkSmartPointer<vtkImplicitBoolean> theCream =
        vtkSmartPointer<vtkImplicitBoolean>::New();
      theCream->SetOperationTypeToDifference();
      theCream->AddFunction(iceCream);
      theCream->AddFunction(bite);

    // The sample function generates a distance function from the
    // implicit function (which in this case is the cone). This is
    // then contoured to get a polygonal surface.
    //
      vtkSmartPointer<vtkSampleFunction> theConeSample =
        vtkSmartPointer<vtkSampleFunction>::New();
      theConeSample->SetImplicitFunction(theCone);
      theConeSample->SetModelBounds(-1, 1.5, -1.25, 1.25, -1.25, 1.25);
      theConeSample->SetSampleDimensions(128, 128, 128);
      theConeSample->ComputeNormalsOff();

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

      vtkSmartPointer<vtkPolyDataMapper> coneMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      coneMapper->SetInputConnection(theConeSurface->GetOutputPort());
      coneMapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> coneActor =
        vtkSmartPointer<vtkActor>::New();
      coneActor->SetMapper(coneMapper);
      coneActor->GetProperty()->SetColor(colors->GetColor3d("chocolate").GetData());

    // The same here for the ice cream.
    //
      vtkSmartPointer<vtkSampleFunction> theCreamSample =
        vtkSmartPointer<vtkSampleFunction>::New();
      theCreamSample->SetImplicitFunction(theCream);
      theCreamSample->SetModelBounds(0, 2.5, -1.25, 1.25, -1.25, 1.25);
      theCreamSample->SetSampleDimensions(128, 128, 128);
      theCreamSample->ComputeNormalsOff();

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

      vtkSmartPointer<vtkPolyDataMapper> creamMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      creamMapper->SetInputConnection(theCreamSurface->GetOutputPort());
      creamMapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> creamActor =
        vtkSmartPointer<vtkActor>::New();
      creamActor->SetMapper(creamMapper);
      creamActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("mint").GetData());
      creamActor->GetProperty()->SetSpecular(.6);
      creamActor->GetProperty()->SetSpecularPower(50);

    // Create the usual rendering stuff
    //
      vtkSmartPointer<vtkRenderer> ren1 =
        vtkSmartPointer<vtkRenderer>::New();

      vtkSmartPointer<vtkRenderWindow> renWin =
        vtkSmartPointer<vtkRenderWindow>::New();
      renWin->AddRenderer(ren1);

      vtkSmartPointer<vtkRenderWindowInteractor> iren =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      iren->SetRenderWindow(renWin);

    // Add the actors to the renderer, set the background and size
    //
      ren1->AddActor(coneActor);
      ren1->AddActor(creamActor);
      ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
      renWin->SetSize(640, 480);
      ren1->ResetCamera();
      ren1->GetActiveCamera()->Roll(90);
      ren1->GetActiveCamera()->Dolly(1.25);
      ren1->ResetCameraClippingRange();
      iren->Initialize();

    // render the image
    //
      renWin->Render();
      iren->Start();
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(IceCream)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(IceCream MACOSX_BUNDLE IceCream.cxx )

    target_link_libraries(IceCream ${VTK_LIBRARIES})

### Download and Build IceCream

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

    cd IceCream/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:

    ./IceCream

WINDOWS USERS

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