[vtkusers] Cannot view lines in camera focal plane

[bruno vtk]

Hi everybody,
It has been quite a long time I try to visualize a polygon resulting from
the simple cut of a sphere by a plane. However, using the code below, I
can't see anything with the original camera setup. I guess that I have
problem because my cut is in the camera focal plane but I don't know how to
solve the problem. Do you have any idea to make this code working (I
wouldn't like to change the camera position and focal point) ?
Thanks a lot,

Bruno

#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkPlane.h>
#include <vtkCutter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

int main(int argc, char **argv)
{
    vtkSphereSource *sphere = vtkSphereSource::New();

    vtkPlane *plane = vtkPlane::New();
    plane->SetOrigin(0., 0., 0.);
    plane->SetNormal(0., 0., 1.);

    vtkCutter *cutter = vtkCutter::New();
    cutter->SetCutFunction(plane);
    cutter->SetInput(sphere->GetOutput());

    vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
    mapper->SetInput(cutter->GetOutput());

    vtkActor *actor = vtkActor::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(1., 0., 0.);
    actor->GetProperty()->SetLineWidth(5.);

    vtkRenderer *renderer = vtkRenderer::New();
    renderer->AddActor(actor);
    renderer->GetActiveCamera()->ParallelProjectionOn();
    renderer->GetActiveCamera()->SetFocalPoint(0., 0., 0);
    renderer->GetActiveCamera()->SetPosition(0., 0., 1.);
    renderer->ResetCameraClippingRange(-1., 1., -1., 1., 0, 1);

    vtkRenderWindow *renderwindow = vtkRenderWindow::New();
    renderwindow->AddRenderer(renderer);

    vtkRenderWindowInteractor *interactor =
vtkRenderWindowInteractor::New();
    interactor->SetRenderWindow(renderwindow);
    interactor->Initialize();
    renderwindow->Render();
    interactor->Start();

    sphere->Delete();
    plane->Delete();
    cutter->Delete();
    mapper->Delete();
    actor->Delete();
    renderer->Delete();
    renderwindow->Delete();
    interactor->Delete();

    return 0;
}
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