[vtkusers] vtkDecimatePro Problem

["한종철"]

I'm graduated student from South Korea.
While looking for the data for vtk, I found this page.
Can I have a question?
I have just started vtk for my project.
In vtk, there are four kinds of mesh simplication and now I'm trying to do it.
This is the simple source from book.

void main()
{
 vtkPolyDataReader *part = vtkPolyDataReader::New();
 part ->SetFileName("C:/VTK/vtkdata/Data/fran_cut.vtk");
 
            vtkDecimatePro *deci = vtkDecimatePro::New();
 deci -> SetInputConnection (part-> GetOutputPort());
 deci -> SetTargetReduction( 0.9);
 deci -> PreserveTopologyOn();
            vtkPolyDataNormals *normals =vtkPolyDataNormals::New();
 normals-> SetInputConnection(part -> GetOutputPort());
 normals -> FlipNormalsOn();

 vtkPolyDataMapper *partMapper = vtkPolyDataMapper::New();
             partMapper -> SetInputConnection(normals -> GetOutputPort());
 
            vtkActor *partActor = vtkActor::New();
 partActor -> SetMapper(partMapper);
 partActor -> GetProperty() -> SetColor(1.0,0.49,0.25);
 vtkRenderer *ren1 = vtkRenderer::New();
 vtkRenderWindow *renWin = vtkRenderWindow::New();
             renWin -> AddRenderer (ren1);
 vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
            iren -> SetRenderWindow(renWin);
 ren1 -> AddActor( partActor);
 ren1 -> SetBackground (1 ,1, 1);
 renWin -> SetSize (800, 800);
 renWin -> Render();

 vtkCamera *cam1 = vtkCamera::New();
             cam1 -> SetClippingRange (0.0475572, 2.37786);
             cam1 -> SetFocalPoint (0.052665, -0.129454 ,-0.0573973);
             cam1 -> SetPosition (0.327637, -0.116299, -0.256418);
             cam1 -> SetViewUp (-0.0225386, 0.999137, 0.034901);
 ren1 -> SetActiveCamera(cam1);
 iren -> Initialize();
            iren->Start();
 
}

I tried many things, but I couldn't get decimated image.
Just, I could get Original Image.
What is the  problem??
Please answer me.
Have a Nice day!
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