# VTK/Examples/Cxx/PolyData/RibbonFilter

< VTK‎ | Examples‎ | Cxx

This example demonstrates how to draw a flat surface (a ribbon) along a line.

## RibbonFilter.cxx

```#include <vtkVersion.h>
#include <vtkSmartPointer.h>

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkCellArray.h>
#include <vtkMath.h>
#include <vtkLine.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkRibbonFilter.h>

int main(int, char *[])
{
// Spiral parameters
unsigned int nV = 256;      // No. of vertices
double vX, vY, vZ;
double rS = 2;              // Spiral radius
unsigned int nCyc = 3;      // No. of spiral cycles
double h = 10;              // Height

unsigned int i;

// Create points and cells for a spiral
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
for(i = 0; i < nV; i++)
{
// Spiral coordinates
vX = rS * cos(2 * vtkMath::Pi() * nCyc * i / (nV - 1));
vY = rS * sin(2 * vtkMath::Pi() * nCyc * i / (nV - 1));
vZ = h * i / nV;
points->InsertPoint(i, vX, vY, vZ);
}

vtkSmartPointer<vtkCellArray> lines =
vtkSmartPointer<vtkCellArray>::New();
lines->InsertNextCell(nV);
for (i = 0; i < nV; i++)
{
lines->InsertCellPoint(i);
}

vtkSmartPointer<vtkPolyData> polyData =
vtkSmartPointer<vtkPolyData>::New();
polyData->SetPoints(points);
polyData->SetLines(lines);

// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> lineMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
lineMapper->SetInput(polyData);
#else
lineMapper->SetInputData(polyData);
#endif

vtkSmartPointer<vtkActor> lineActor =
vtkSmartPointer<vtkActor>::New();
lineActor->SetMapper(lineMapper);
lineActor->GetProperty()->SetColor(.8, .4, .2);
lineActor->GetProperty()->SetLineWidth(3);

// Create a ribbon around the line
vtkSmartPointer<vtkRibbonFilter> ribbonFilter =
vtkSmartPointer<vtkRibbonFilter>::New();
#if VTK_MAJOR_VERSION <= 5
ribbonFilter->SetInput(polyData);
#else
ribbonFilter->SetInputData(polyData);
#endif
ribbonFilter->SetWidth(.4);

// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> ribbonMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
ribbonMapper->SetInputConnection(ribbonFilter->GetOutputPort());

vtkSmartPointer<vtkActor> ribbonActor =
vtkSmartPointer<vtkActor>::New();
ribbonActor->SetMapper(ribbonMapper);

// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();

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

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

// Add the actor to the scene

// Render and interact
renderer->SetBackground(.2, .3, .4);

// Generate an interesting view
renderer->GetActiveCamera()->Azimuth(40);
renderer->GetActiveCamera()->Elevation(30);
renderer->ResetCamera();
renderer->ResetCameraClippingRange();

renderWindow->Render();
renderWindowInteractor->Start();

return EXIT_SUCCESS;
}
```

# Please try the new VTKExamples website.

## CMakeLists.txt

```cmake_minimum_required(VERSION 2.8)

PROJECT(RibbonFilter)

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

if(VTK_LIBRARIES)
else()
endif()
```

```cd RibbonFilter/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:

```./RibbonFilter
```

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