[vtkusers] Z-fighting problem on intel hd graphics

[Ken Martin]

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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Ken Martin PhD
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Kitware Inc.
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