[vtkusers] Z-fighting problem on intel hd graphics

[RobertS]

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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