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<p class="MsoNormal">To activate anti-aliasing, you can enable FXAA in the renderer using
<span style="font-size:8.0pt;font-family:Courier;color:#000096">renderer.UseFXAAOn()
</span>or set number of samples in the render window using <span style="font-size:8.0pt;font-family:Courier;color:#000096">
renderWindow.setMultiSamples(8)</span> (if you render in a Qt widget, adjust samples property in the window’s surface format -
<a href="http://doc.qt.io/qt-5/qsurfaceformat.html#setSamples">http://doc.qt.io/qt-5/qsurfaceformat.html#setSamples</a>). Anti-aliasing has impact on performance and may not be compatible with some rendering options.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Andras<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> vtkusers <vtkusers-bounces@vtk.org> <b>On Behalf Of
</b>Mohamed Amine Mzoughi<br>
<b>Sent:</b> Wednesday, December 26, 2018 10:38 AM<br>
<b>To:</b> Paulo Carvalho <paulo.r.m.carvalho@gmail.com>; vtkusers@public.kitware.com<br>
<b>Subject:</b> Re: [vtkusers] anti-aliasing<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Hello again,<o:p></o:p></p>
<p>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) !<o:p></o:p></p>
<p>I give up for the moment !<o:p></o:p></p>
<p>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
!).<o:p></o:p></p>
<p>Thanks anyway.<o:p></o:p></p>
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<p class="MsoNormal">Le 26/12/2018 à 16:02, Paulo Carvalho a écrit :<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi, Mohammed,<o:p></o:p></p>
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<p class="MsoNormal"> 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:<o:p></o:p></p>
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<p class="MsoNormal"><br>
<span style="color:maroon">m_renderer</span><span style="color:silver"> </span>=<span style="color:silver">
</span><span style="color:purple">vtkSmartPointer</span><<span style="color:purple">vtkRenderer</span>>::<span style="color:#00677C">New</span>();<br>
<span style="color:maroon">m_renderer</span>-><i><span style="color:#00677C">UseFXAAOn</span></i>();<br>
<br>
vtkFXAAOptions* const aaOpts = m_renderer->GetFXAAOptions();<br>
aaOpts->SetRelativeContrastThreshold(0.125);<br>
aaOpts->SetHardContrastThreshold(0.045);<br>
aaOpts->SetSubpixelBlendLimit(0.75);<br>
aaOpts->SetSubpixelContrastThreshold(0.25);<br>
aaOpts->SetUseHighQualityEndpoints(true);<br>
aaOpts->SetEndpointSearchIterations(12);<br>
<br>
<span style="color:maroon">m_view</span>-><i><span style="color:#00677C">GetRenderWindow</span></i>()-><i><span style="color:#00677C">AddRenderer</span></i>(<span style="color:maroon"> m_renderer</span> );<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">cheers,<o:p></o:p></p>
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<p class="MsoNormal">Paulo<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Em qua, 26 de dez de 2018 às 12:15, Mohamed Amine Mzoughi <<a href="mailto:aminemzoughi@febus-optics.com">aminemzoughi@febus-optics.com</a>> escreveu:<o:p></o:p></p>
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<p>Hello Paulo,<o:p></o:p></p>
<p>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).
<o:p></o:p></p>
<p>In ParaView, the line is smooth :<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><img border="0" width="1317" height="510" style="width:13.7222in;height:5.3125in" id="_x0000_i1025" src="cid:image001.png@01D49DF9.6FAAD070"><br>
whereas in my VTK app, it isn't :<br>
<br>
<img border="0" width="1107" height="194" style="width:11.5347in;height:2.0208in" id="_x0000_i1026" src="cid:image002.png@01D49DF9.6FAAD070"><br>
<br>
I don't know the issue...<br>
<br>
I'm calling the FXAA instructions before Render() in the constructor, I tried even to call them before each call to Render().<br>
<br>
Best regards.<o:p></o:p></p>
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<p class="MsoNormal">Le 26/12/2018 à 14:21, Paulo Carvalho a écrit :<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello, Mohamed!<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> It seems that your last calls (*SmoothingOn()) conflict with UseFXAAOn().<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">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:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><img border="0" width="561" height="354" style="width:5.8472in;height:3.6875in" id="_x0000_i1027" src="cid:image004.jpg@01D49DF9.6FAAD070" alt="image.png"><o:p></o:p></p>
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<p class="MsoNormal">This one is rendered with only UseFXAAOn() and some configuration to the vtkFXAAOptions object like you did:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><img border="0" width="561" height="366" style="width:5.8472in;height:3.8125in" id="_x0000_i1028" src="cid:image006.jpg@01D49DF9.6FAAD070" alt="image.png"><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">kind regards,<o:p></o:p></p>
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<p class="MsoNormal">Paulo<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Em qua, 26 de dez de 2018 às 10:03, Mohamed Amine Mzoughi <<a href="mailto:aminemzoughi@febus-optics.com" target="_blank">aminemzoughi@febus-optics.com</a>> escreveu:<o:p></o:p></p>
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<p class="MsoNormal">Hello,<br>
<br>
I want to enable Anti-alisaing in my VTK app, so I took some parameters <br>
from ParaView and it still doesn't work :<br>
<br>
m_view->GetRenderer()->UseFXAAOn(); // enable AA<br>
<br>
vtkFXAAOptions* const aaOpts = m_view->GetRenderer()->GetFXAAOptions();<br>
aaOpts->SetRelativeContrastThreshold(0.125);<br>
aaOpts->SetHardContrastThreshold(0.045);<br>
aaOpts->SetSubpixelBlendLimit(0.75);<br>
aaOpts->SetSubpixelContrastThreshold(0.25);<br>
aaOpts->SetUseHighQualityEndpoints(true);<br>
aaOpts->SetEndpointSearchIterations(12);<br>
<br>
what am I missing ?<br>
<br>
Also, m_view->GetRenderWindow()->GetMultiSamples() => returns 8.<br>
<br>
and I called also :<br>
<br>
m_view->GetRenderWindow()->LineSmoothingOn();<br>
m_view->GetRenderWindow()->PolygonSmoothingOn(); <br>
m_view->GetRenderWindow()->PointSmoothingOn();<br>
<br>
Thanks.<br>
<br>
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