[vtkusers] Reply : Why could vtkgl::GenBuffers == NULL ?

[Francois Bertel]

Are you using vtkgl::GenBuffers in you own code or does it happen in a
vtk class?

On Thu, May 27, 2010 at 11:17 AM, Oliver Kania
<kania.oliver at googlemail.com> wrote:
> Sadly, I am using VS 2008 on Windows and direct rendering.
> Does someone know any other possible reason for vtkgl::GenBuffers == NULL ?
>
> Regards,
> Oliver
>
> 2010/5/27 Francois Bertel <francois.bertel at kitware.com>
>>
>> Are you using indirect rendering mode on Linux? If so, try VTK git, it
>> should be fixed (a workaround for a nVidia bug in indirect rendering
>> mode on Linux)
>>
>> On Thu, May 27, 2010 at 6:51 AM, Oliver Kania
>> <kania.oliver at googlemail.com> wrote:
>> > In a previous post, I said that my App crashes with VTK 5.6 but not 5.2
>> > because GenBuffers == NULL during Interactor::Render.
>> > I found a post in the archive that says GenBuffers is NULL if the OpenGl
>> > Version is < 1.5 and
>> > a certain extension is not loaded.
>> > How do I query the OpenGL version which is used by VTK and how do I
>> > change
>> > it ?
>> > However, my driver supports GL > 2.0, and I guess VTK does load the best
>> > possible version.
>> > What other reason could there be for GenBuffers == NULL ?
>> > Is it possible to avoid usage of this function by VTK ?
>> >
>> > Best Regards, Oliver
>> >
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>>
>>
>>
>> --
>> François Bertel, PhD  | Kitware Inc. Suite 204
>> 1 (518) 371 3971 x113 | 28 Corporate Drive
>>                      | Clifton Park NY 12065, USA
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
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>



-- 
François Bertel, PhD  | Kitware Inc. Suite 204
1 (518) 371 3971 x113 | 28 Corporate Drive
                      | Clifton Park NY 12065, USA