[vtkusers] anti-aliasing
Mohamed Amine Mzoughi
aminemzoughi at febus-optics.com
Mon Dec 31 04:44:38 EST 2018
Hello Andras,
Thank you very much, in fact, calling the antialisaing code of
pqContextView::createWidget() after creating a QVTKOpenGLWidget fixed my
aliasing problem
(https://github.com/Kitware/ParaView/blob/master/Qt/Core/pqContextView.cxx#L143)
BTW, I am using an old version of ParaView (and also VTK) as I'm working
under Centos 7 (but I will update VTK/Paraview when the version 8 is
released).
Happy New Year 2019.
Amine.
Le 28/12/2018 à 19:03, Andras Lasso a écrit :
>
> Plot axes are not painted correctly when multi-sampling is enabled due
> to an OpenGL error in vtkTextureObject::CopyFromFrameBuffer, which
> seems to be related to copying data from the frame buffer.
>
> [ERROR][VTK] 28.12.2018 12:51:01 [vtkTextureObject (0000026457878B60)]
> (C:\D\S4D\VTK\Rendering\OpenGL2\vtkTextureObject.cxx:1990) - failed at
> glCopyTexImage2D 32856 1 OpenGL errors detected
>
> 0 : (1282) Invalid operation
>
> Andras
>
> *From:* Andras Lasso
> *Sent:* Friday, December 28, 2018 12:52 PM
> *To:* 'Mohamed Amine Mzoughi' <aminemzoughi at febus-optics.com>; Paulo
> Carvalho <paulo.r.m.carvalho at gmail.com>; vtkusers at public.kitware.com
> *Subject:* RE: [vtkusers] anti-aliasing
>
> Multi-sampling works well for me (it smoothes lines, etc.) except axes
> areas appear black. This is probably a VTK bug that should be fixed,
> but maybe I just have not configured everything correctly.
>
> ParaView uses multi-sampling for anti-aliasing in plots and not FXAA
> (https://github.com/Kitware/ParaView/blob/master/Qt/Core/pqContextView.cxx#L143,
> https://gitlab.kitware.com/paraview/paraview/issues/17202).
> Anti-aliasing in plots works well in Paraview 5.5.2 (smooth lines,
> properly rendered axes). *There is no antialiasing in plots in
> ParaView 5.6.0 (lines are jagged), so there may be some multi-sampling
> related issues in recent VTK version.*
>
> Andras
>
> *From:* Mohamed Amine Mzoughi <aminemzoughi at febus-optics.com
> <mailto:aminemzoughi at febus-optics.com>>
> *Sent:* Friday, December 28, 2018 10:01 AM
> *To:* Andras Lasso <lasso at queensu.ca <mailto:lasso at queensu.ca>>; Paulo
> Carvalho <paulo.r.m.carvalho at gmail.com
> <mailto:paulo.r.m.carvalho at gmail.com>>; vtkusers at public.kitware.com
> <mailto:vtkusers at public.kitware.com>
> *Subject:* Re: [vtkusers] anti-aliasing
>
> 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
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdoc.qt.io%2Fqt-5%2Fqsurfaceformat.html%23setSamples&data=02%7C01%7Classo%40queensu.ca%7C753aca6286994b17a15d08d66cd53b4f%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636816060432571103&sdata=kKNCZ2h%2FT81oqw77gwhW4lT%2BcLqeLtxOlvFuHOciieY%3D&reserved=0>).
> Anti-aliasing has impact on performance and may not be compatible
> with some rendering options.
>
> Andras
>
> *From:* vtkusers <vtkusers-bounces at vtk.org>
> <mailto: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>
> <mailto:paulo.r.m.carvalho at gmail.com>; vtkusers at public.kitware.com
> <mailto: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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