[vtkusers] Offscreen rendering problems on headless Ubuntu

[Sophonet]

For the files: This seemed to do the trick with the :

https://www.vtk.org/pipermail/vtk-developers/2017-November/035592.html

Even though print(rw.ReportCapabilities()) did not reveal any 
extensions, rendering now works... hope that this gets fixed some time.

Thanks,

      Sophonet


On 2018-01-05 15:42, Sophonet wrote:
> One more update:
> 
> First of all some correction: glxinfo of course shows the X rendering
> capabilities, not the OSMesa ones, so glxinfo is not the tool of
> choice.
> 
> Then: It seems that Ubuntu's mesa (16.04 update) does not ship with
> llvmpipe drivers for OSMesa, so I have built OSMesa myself, without X,
> based on Utkarsh's hints at
> https://blog.kitware.com/messing-with-mesa-for-paraview-5-0vtk-7-0/.
> 
> However, it seems that no OpenGL extensions are available (see output 
> below).
> 
> Any hint how mesa needs to be compiled / what runtime variables need
> to be set in order to support OpenGL extensions in OSMesa?
> 
> Thanks,
> 
>      Sophonet
> 
> 
> Debug output:
> In [1]: import vtk
> In [2]: rw = vtk.vtkRenderWindow()
> In [3]: rw.SetOffScreenRendering(1)
> In [4]: rw.Render()
> ERROR: In
> /home/CODE1/dep14473/SW/source/VTK-8.1.0/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx,
> line 797
> vtkOSOpenGLRenderWindow (0x2ebb060): GL version 2.1 with the
> gpu_shader4 extension is not supported by your graphics driver but is
> required for the new OpenGL rendering backend. Please update your
> OpenGL driver. If you are using Mesa please make sure you have version
> 10.6.5 or later and make sure your driver in Mesa supports OpenGL 3.2.
> 
> In [5]: print(rw.ReportCapabilities())
> OpenGL vendor string:  VMware, Inc.
> OpenGL renderer string:  llvmpipe (LLVM 5.0, 256 bits)
> OpenGL version string:  3.3 (Core Profile) Mesa 17.3.1
> OpenGL extensions:
> 
> ---- (No OpenGL extensions are reported)
> 
> 
> On 2018-01-04 14:35, Sophonet wrote:
>> Hi list, happy new year!
>> 
>> I have compiled VTK 8.1.0 on a headless Ubuntu 16.04 with OSMesa
>> support (flags: -D VTK_RENDERING_BACKEND="OpenGL2" -D
>> VTK_OPENGL_HAS_OSMESA=True).
>> 
>> Using python (for example), I see an error about an unsupported OpenGL
>> version (see below). However, Ubuntu comes with mesa 17.2.4 (which
>> should be recent enough). Moreover, glxinfo shows "OpenGL core profile
>> version string: 3.3 (Core Profile) Mesa 17.2.4.
>> 
>> Any clues what went wrong?
>> 
>> Thanks,
>> 
>>       Sophonet
>> 
>> 
>> In [1]: import vtk
>> In [2]: rw = vtk.vtkRenderWindow()
>> In [3]: rw.SetOffScreenRendering(1)
>> In [4]: rw.Render()
>> ERROR: In
>> /home/CODE1/dep14473/SW/source/VTK-8.1.0/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx,
>> line 797
>> vtkOSOpenGLRenderWindow (0x1991250): GL version 2.1 with the
>> gpu_shader4 extension is not supported by your graphics driver but is
>> required for the new OpenGL rendering backend. Please update your
>> OpenGL driver. If you are using Mesa please make sure you have version
>> 10.6.5 or later and make sure your driver in Mesa supports OpenGL 3.2.
>> 
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