[vtkusers] Z-fighting problem on intel hd graphics

Fri Aug 26 03:08:18 EDT 2016

2016-08-25 18:43 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 2016-08-25 18:36 GMT+02:00 Róbert Špir <spir.robert at gmail.com>:
>
>> it works ok after switching to qvtkwidget2, even the multisampling under
>> linux, which wasn’t working with qvtkwidget
>>
>
> Ah, that's good to know. I believe when I was having the problem, I was
> working through Python, so was using QVTKRenderWindowInteractor (or maybe
> my own similar class), which is yet another thing (QVTKWidget / QVTKWidget2
> are not wrapped).
>
> Glad it worked out anyway. Nowadays I'm using C++ and QVTKWidget2 too.
>

I was actually wrong. I had a look at my code, and I'm using QVTKWidget
(not QVTKWidget2), and what I did to get around problems with Z-ordering
and also to get multisampling working reliably was this (from the
constructor of my QVTKWidget subclass):

    QSurfaceFormat surfaceFormat = windowHandle()->format();
    surfaceFormat.setSamples(8);
    surfaceFormat.setStencilBufferSize(8);
    windowHandle()->setFormat(surfaceFormat);

Hope that helps someone else using QVTKWidget.

Elvis

>
> Elvis
>
>
>>
>>
>> *From:* Elvis Stansvik [mailto:elvis.stansvik at orexplore.com]
>> *Sent:* Thursday, August 25, 2016 6:24 PM
>> *To:* RobertS <spir.robert at gmail.com>
>> *Cc:* VTK Users <vtkusers at vtk.org>; Ken Martin <ken.martin at kitware.com>
>>
>> *Subject:* Re: [vtkusers] Z-fighting problem on intel hd graphics
>>
>>
>>
>> Den 25 aug. 2016 5:35 em skrev "Róbert Špir" <spir.robert at gmail.com>:
>> >
>> > ok, everything works fine without qvtkwidget, so the problem is
>> somewhere there
>>
>> I don't remember exactly, but I think I had the same problem. Should be
>> somewhere on this list I think.
>>
>> I think it's possible to work around by manually setting the stencil
>> buffer size on the QGLFormat used by the widget.
>>
>> On the bus at the moment so have limited ability to search.
>>
>> Elvis
>>
>> >
>> >
>> >
>> > From: Róbert Špir [mailto:spir.robert at gmail.com]
>> > Sent: Thursday, August 25, 2016 2:56 PM
>> > To: 'Ken Martin' <ken.martin at kitware.com>
>> > Cc: 'vtk' <vtkusers at vtk.org>
>> > Subject: RE: [vtkusers] Z-fighting problem on intel hd graphics
>> >
>> >
>> >
>> > I made a few more tests:
>> >
>> > the same problem happens with llvmpipe and with nvidia with nouveau
>> driver
>> >
>> > doesn’t happen on nvidia binary driver or in OS X with intel or nvidia
>> or in windows with intel or nvidia
>> >
>> > So maybe it’s a bug in mesa? Currently I’m using qt5 with qvtkwidget,
>> I will try to create minimalistic example without qt to see if the problem
>> is reproducible
>> >
>> >
>> >
>> > From: Ken Martin [mailto:ken.martin at kitware.com]
>> > Sent: Tuesday, August 23, 2016 6:45 PM
>> > To: RobertS <spir.robert at gmail.com>
>> > Cc: vtk <vtkusers at vtk.org>
>> > Subject: Re: [vtkusers] Z-fighting problem on intel hd graphics
>> >
>> >
>> >
>> > This sounds like a driver issue. I suppose you could try setting the
>> following environment variable
>> >
>> >
>> >
>> > GALLIUM_DRIVER=llvmpipe
>> >
>> >
>> >
>> > to switch to software rendering and see if the problem goes away.  If
>> nvidia and mesa llvmpipe both work on your linux system then I would really
>> suspect the intel linux driver.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Wed, Aug 17, 2016 at 6:17 AM, RobertS <spir.robert at gmail.com> wrote:
>> >>
>> >> Hi all,
>> >> I'm doing simple visualization of data on rectangular grid by creating
>> >> vtkpolydata from single vtktrianglestrip and when running the
>> application in
>> >> linux on intel hd graphics there is serious problem with z-fighting
>> where
>> >> the parts that should be far away are overlapping parts that are near
>> the
>> >> camera. This doesn't happen when running on windows (intel or nvidia)
>> or on
>> >> linux with nvidia
>> >> here you can see the problem, the camera angle is still the same
>> >> http://tesla.math.sk/intel1.jpg <http://tesla.math.sk/intel1.jpg>
>> >> http://tesla.math.sk/nvidia1.jpg <http://tesla.math.sk/nvidia1.jpg>
>> >> another angle
>> >> http://tesla.math.sk/intel2.jpg <http://tesla.math.sk/intel2.jpg>
>> >> http://tesla.math.sk/nvidia2.jpg <http://tesla.math.sk/nvidia2.jpg>
>> >> this happens on vtk 7.0 and also on vtk 7.1 from git
>> >> tested hardware is intel hd graphics on haswell, and ivy bridge (mesa
>> 11.2
>> >> and 12.0 with opengl 3.3) and on broadwell with mesa 12.0 with opengl
>> 4.4
>> >> Is this a known issue or am I doing something wrong?
>> >>
>> >>
>> >>
>> >> --
>> >> View this message in context: http://vtk.1045678.n5.nabble.c
>> om/Z-fighting-problem-on-intel-hd-graphics-tp5739803.html
>> >> Sent from the VTK - Users mailing list archive at Nabble.com.
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>> >
>> >
>> >
>> > --
>> >
>> > Ken Martin PhD
>> >
>> > Chairman & CFO
>> > Kitware Inc.
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