[vtkusers] Error using vtkOpenGLGPUVolumeRayCastMapper on OS X

[David Warren]

Hi Sean,

     Wow, nice find!  My colleague who is having trouble has AMD graphics
and is running OS X.  We haven't observed the same problems on Linux and
Windows machines with Intel and NVIDIA graphics.  Many thanks,

Dave

On Thu, Mar 24, 2016 at 4:03 PM, Sean McBride <sean at rogue-research.com>
wrote:

> On Thu, 24 Mar 2016 12:46:34 -0500, David Warren said:
>
> >ERROR: In
> >/Users/ilan/minonda/conda-bld/work/VTK-6.3.0/Rendering/VolumeOpenGL/
> >vtkOpenGLGPUVolumeRayCastMapper.cxx,
> >line 4040
> >vtkOpenGLGPUVolumeRayCastMapper (0x103b90000): Rendering failed because
> the
> >following OpenGL extensions are required but not supported:  Disabled on
> >Apple OS X Snow Leopard with nVidia.
>
> If you search the VTK codebase for "Snow Leopard with nVidia" and dig
> through git history, we find commit
> 08abcf15a5a333096f406dfe5b34d2b7bc47bdf8.  See:
>
> <https://github.com/Slicer/VTK/commit/add058e>
>
> Seems it's a workaround for an OS X 10.6 (Snow Leopard) bug that was
> apparently fixed in 10.7 (Lion).  The code does a fragile check that's
> probably failing for you.
>
> Actually, I think the check was recently broken in
> 56a17fafa4e389058c89401bdffd524ba873e622 by Max (cc'ed).
>
> Do you have an nVidia, AMD/ATI, or Intel GPU?
>
> I'll make a patch to clean it all up...
>
> Cheers,
>
> --
> ____________________________________________________________
> Sean McBride, B. Eng                 sean at rogue-research.com
> Rogue Research                        www.rogue-research.com
> Mac Software Developer              Montréal, Québec, Canada
>
>
>
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