[vtkusers] OpenGL fails to initialize for Windows 7, VTK 7.0

Ken Martin ken.martin at kitware.com
Mon Feb 22 21:59:47 EST 2016

If your card supports OpenGL 4 then I would think it would also provide a
3.2 context. I'm not aware of cards that support 4.0 but would not return a
3.2 context when requested. If you check out and build VTK master you could
try running

ctest -R VBOPLY -VV


ctest -R Apple -VV

the output of those two tests can be helpful in debugging these issues.
Also maybe your system has two GPUs? Like intel on chip plus a dedicated
GPU and somehow you are not getting the dedicated GPU maybe?  Just some

On Mon, Feb 22, 2016 at 3:03 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> If you get the master branch, it includes this patch which might be
> related:
> https://gitlab.kitware.com/vtk/vtk/commit/8d0daf13
> On Mon, Feb 22, 2016 at 12:33 PM, Matthias Blaicher <matthias at blaicher.com
> > wrote:
>> Hi David,
>> I guess you are right, it looks like this is the issue. According to
>> OpenGL Extensions Viewer, the card exposes OpenGL 4.
>> If I understood it correctly, the problem seems to be that gpu_shader4
>> is not exposed in the 2.1 context. And 3.2 is tested but fails (have to
>> check that for my card).
>> Is there any patch, which would try a 3.1 context too? I've seen some
>> commits in master (e.g. ca65662fa "Merge topic
>> 'try_more_recent_opengl_add_getversion'"). I'll give the master branch a
>> spin and report back.
>> Best,
>> Matthias
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Ken Martin PhD
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