Mesh lines display discontinuity

Support
,
2

I try to use FXAA,but not improve;

       renderer->UseFXAAOn();

    // configure the FXAA antialiasing
    vtkSmartPointer<vtkFXAAOptions> fxaaOptions = renderer->GetFXAAOptions();
    fxaaOptions->SetSubpixelBlendLimit(1 / 2.0);
    //fxaaOptions->SetSubpixelContrastThreshold(1/2.0);
    //fxaaOptions->SetRelativeContrastThreshold(0.125);
    //fxaaOptions->SetHardContrastThreshold(0.045);
    //fxaaOptions->SetSubpixelBlendLimit(0.75);
    //fxaaOptions->SetSubpixelContrastThreshold(0.25);
    //fxaaOptions->SetUseHighQualityEndpoints(true);
    //fxaaOptions->SetEndpointSearchIterations(12);