[vtkusers] anti-aliasing
Mohamed Amine Mzoughi
aminemzoughi at febus-optics.com
Fri Dec 28 10:00:35 EST 2018
As you can see in the screenshots below, I was unable to smooth
vtkChartXY's plot line (displayed on a QVTKOpenGLWidget) plot with
UseFXAAOn and setMultiSamples(8) (multi samples is defaulted to 8 anyway).
Changing the surface format's samples number messed badly the 2D charts
with black areas. This is what I've done in constructor :
QSurfaceFormat surface = m_widget->format();
std::cout << "[debug] Qt widget samples = " << surface.samples() <<
std::endl; // 0 by default (disabled)
surface.setSamples(8);
m_widget->setFormat(surface);
Regards.
Le 27/12/2018 à 22:45, Andras Lasso a écrit :
>
> To activate anti-aliasing, you can enable FXAA in the renderer using
> renderer.UseFXAAOn() or set number of samples in the render window
> using renderWindow.setMultiSamples(8) (if you render in a Qt widget,
> adjust samples property in the window’s surface format -
> http://doc.qt.io/qt-5/qsurfaceformat.html#setSamples). Anti-aliasing
> has impact on performance and may not be compatible with some
> rendering options.
>
> Andras
>
> *From:* vtkusers <vtkusers-bounces at vtk.org> *On Behalf Of *Mohamed
> Amine Mzoughi
> *Sent:* Wednesday, December 26, 2018 10:38 AM
> *To:* Paulo Carvalho <paulo.r.m.carvalho at gmail.com>;
> vtkusers at public.kitware.com
> *Subject:* Re: [vtkusers] anti-aliasing
>
> Hello again,
>
> If I do that, the chart is not visible anymore (the Qt widget is all
> black), if I change the renderer of the vtkContextView also (the Qt
> widget is all white) !
>
> I give up for the moment !
>
> ParaView is a such complex software, that I can't trace the stuff
> related to anti-alisaing in it (reverse engineering ParaView it is
> tough : a complex build system, many layers, proxies, in fact, it's an
> oriented object mix of a lasagna and spaghetti code !).
>
> Thanks anyway.
>
> Le 26/12/2018 à 16:02, Paulo Carvalho a écrit :
>
> Hi, Mohammed,
>
> Strange indeed. Did you create the vtkRender object yourself
> or you just used the default one returned by GetRenderer()? If the
> latter is your case, I recommend creating your own vtkRender:
>
>
> m_renderer=vtkSmartPointer<vtkRenderer>::New();
> m_renderer->/UseFXAAOn/();
>
> vtkFXAAOptions* const aaOpts = m_renderer->GetFXAAOptions();
> aaOpts->SetRelativeContrastThreshold(0.125);
> aaOpts->SetHardContrastThreshold(0.045);
> aaOpts->SetSubpixelBlendLimit(0.75);
> aaOpts->SetSubpixelContrastThreshold(0.25);
> aaOpts->SetUseHighQualityEndpoints(true);
> aaOpts->SetEndpointSearchIterations(12);
>
> m_view->/GetRenderWindow/()->/AddRenderer/(m_renderer );
>
> cheers,
>
> Paulo
>
> Em qua, 26 de dez de 2018 às 12:15, Mohamed Amine Mzoughi
> <aminemzoughi at febus-optics.com
> <mailto:aminemzoughi at febus-optics.com>> escreveu:
>
> Hello Paulo,
>
> Even without SmoothingOn* instructions, I still have a problem
> in my 2D charts (I use a subclass of vtkChartXY, same issue
> with vtkHistogramChart2D, I have rectangles in screen).
>
> In ParaView, the line is smooth :
>
>
> whereas in my VTK app, it isn't :
>
>
>
> I don't know the issue...
>
> I'm calling the FXAA instructions before Render() in the
> constructor, I tried even to call them before each call to
> Render().
>
> Best regards.
>
> Le 26/12/2018 à 14:21, Paulo Carvalho a écrit :
>
> Hello, Mohamed!
>
> It seems that your last calls (*SmoothingOn()) conflict
> with UseFXAAOn().
>
> Here is the output I get when I add a call to
> PolygonSmoothingOn(). Not only it is not antialiased, but
> you can notice the edges triangle strips, visually ruining
> the results:
>
> image.png
>
> This one is rendered with only UseFXAAOn() and some
> configuration to the vtkFXAAOptions object like you did:
>
> image.png
>
> kind regards,
>
> Paulo
>
> Em qua, 26 de dez de 2018 às 10:03, Mohamed Amine Mzoughi
> <aminemzoughi at febus-optics.com
> <mailto:aminemzoughi at febus-optics.com>> escreveu:
>
> Hello,
>
> I want to enable Anti-alisaing in my VTK app, so I
> took some parameters
> from ParaView and it still doesn't work :
>
> m_view->GetRenderer()->UseFXAAOn(); // enable AA
>
> vtkFXAAOptions* const aaOpts =
> m_view->GetRenderer()->GetFXAAOptions();
> aaOpts->SetRelativeContrastThreshold(0.125);
> aaOpts->SetHardContrastThreshold(0.045);
> aaOpts->SetSubpixelBlendLimit(0.75);
> aaOpts->SetSubpixelContrastThreshold(0.25);
> aaOpts->SetUseHighQualityEndpoints(true);
> aaOpts->SetEndpointSearchIterations(12);
>
> what am I missing ?
>
> Also, m_view->GetRenderWindow()->GetMultiSamples() =>
> returns 8.
>
> and I called also :
>
> m_view->GetRenderWindow()->LineSmoothingOn();
> m_view->GetRenderWindow()->PolygonSmoothingOn();
> m_view->GetRenderWindow()->PointSmoothingOn();
>
> Thanks.
>
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