# inner edge display for quadric element is not correct for version 9.1

**URL:** <https://discourse.vtk.org/t/inner-edge-display-for-quadric-element-is-not-correct-for-version-9-1/7665>\
**Category:** Support\
**Created:** [January 18, 2022, 10:15am UTC](https://discourse.vtk.org/t/inner-edge-display-for-quadric-element-is-not-correct-for-version-9-1/7665 "2022-01-18T10:15:17Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Jay-Yu](https://discourse.vtk.org/user_avatar/discourse.vtk.org/jay-yu/32/4554_2.png) [@Jay-Yu](https://discourse.vtk.org/u/Jay-Yu)\
**Post date:** [January 19, 2022, 12:55am UTC](https://discourse.vtk.org/t/inner-edge-display-for-quadric-element-is-not-correct-for-version-9-1/7665/4 "2022-01-19T00:55:04Z")

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Dear Cory Quammen and Mathieu Westphal,

thanks for your reply. Below is the sample code i used to test and generate above images.

```auto
void testReadPolydata(int argc, char* argv[])
{
    vtkNew<vtkXMLPolyDataReader> reader;
    reader->SetFileName(argv[1]);
    reader->Update();

    auto poly = reader->GetOutput();

    vtkNew<vtkOpenGLPolyDataMapper> mapper;
    mapper->SetInputData(poly);

    vtkNew<vtkActor> actor;
    actor->SetMapper(mapper);
    actor->GetProperty()->SetEdgeVisibility(1);

    vtkNew<vtkRenderer> render;
    render->AddViewProp(actor);

    vtkNew<vtkRenderWindow> window;
    window->AddRenderer(render);

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

    renderWindowInteractor->Initialize();

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

}

```

thanks for your kindly help!

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