[vtkusers] Z-fighting problem on intel hd graphics

[Elvis Stansvik]

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?
>>
>>
>>
>> --
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http://vtk.1045678.n5.nabble.com/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
>
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