[vtkusers] anti-aliasing

Thu Dec 27 16:45:56 EST 2018

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 :
[cid:image001.png at 01D49DF9.6FAAD070]
whereas in my VTK app, it isn't :

[cid:image002.png at 01D49DF9.6FAAD070]

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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