[vtk-developers] VTKEdge on OS X 10.6

[David Gobbi]

Okay, now I see what was happening.  When I tried VTKEdge on my Mac
before, it was just doing a fall-back to 3D texture mapping.  I tried
it again and when I zoom in, I can clearly see the polys.  When I
comment out the "LoadExtensionsSucceeded = 0" line, it crashes just as
described.

Well, it is still very good to see the GPU ray casting in VTK.  The
fact that it is wrapped makes it much easier for me to experiment with
it.

   David


On Mon, Feb 22, 2010 at 7:39 AM, Francois Bertel
<francois.bertel at kitware.com> wrote:
> Hi Fauze,
>
> What do you mean by "4) ... these statements were removed from
> vtkKWEOpenGLGPUVolumeRayCastMapper.cxx.?
>
> vtkKWEOpenGLGPUVolumeRayCastMapper.cxx has been removed from VTKEdge
> and moved as vtkOpenGLGPUVolumeRayCastMapper.cxx in
> VTK/VolumeRendering and the statement about snow leopard is still there.
>
>
>
> On Fri, Feb 19, 2010 at 8:21 PM, Fauze Polpeta <fauze.polpeta at gmail.com> wrote:
>> Dear David;
>>
>> Last 2 weeks I'm pursuing to get vtkOpenGLGPUVolumeRayCastMapper properly
>> working on Mac OS X. In respect to that consider the following:
>>
>> 1) vtkOpenGLGPUVolumeRayCastMapper has been moved to VTK repository, but it
>> still can be found at
>>
>> "https://www.kitware.com/svn/KWPublic/trunk/VTKEdge-5-4-0/" instead of
>> https://www.kitware.com/svn/KWPublic/trunk/VTKEdge/
>>
>> 2) The error you are facing is probably a consequence of the following
>> statements in vtkKWEOpenGLGPUVolumeRayCastMapper.cxx
>>
>> #ifdef __APPLE__
>> this->LoadExtensionsSucceeded = 0;
>> return;
>> #endif
>>
>> 3) This was placed to avoid a bug in NVidia driver for Snow Leopard (a
>> infinite loop) but such statements were also affecting Leopard.
>>
>> 4) Today, I saw that these statements were removed from
>> vtkKWEOpenGLGPUVolumeRayCastMapper.cxx. So after updating your source code,
>> you will probably be able to get GPU-based Ray Cast working in Leopard but
>> not yet in Snow Leopard.
>>
>> 5) However, I'm facing two problems that I'm not able to set them as VTKEdge
>> issues or new NVidia bugs in Mac OS X.
>>
>> a) GPU-based Ray Cast is not working for DICOM CT datasets that have more
>> than 170 images (aprox.) and are 512x512 in size. Resultant volume is very
>> "scratched".
>>
>> b) Shading (3D Textures, etc) doesn't work as well. Interacting with the
>> volume is very compromised, I can say impossible.
>>
>> 6) I run the same tests on Linux and everything went fine.
>>
>> 7) I tried VolView 3.2, which, in principle, relies on the same approach
>> (perhaps, the same library) for performing GPU-based Ray Cast, but it
>> crashes when GPU support is active. My guess this is caused by the
>> statements mentioned in 2).
>>
>> 8) More on this you will find on my submissions to the VTKEdge mailing list:
>>
>> http://public.kitware.com/pipermail/vtkedge/2010-February/000295.html
>> http://public.kitware.com/pipermail/vtkedge/2010-February/000296.html
>>
>> Hope it helps you.
>>
>> Best Regards
>>
>> Fauze
>>
>>
>> On Fri, Feb 19, 2010 at 3:04 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>>>
>>> I'm seeing the following error when I try to use the new GPU ray cast
>>> mapper on my Mac.  The last time that I tried VTKEdge on this machine
>>> (a few weeks ago) there were no problems.
>>>
>>>
>>> ERROR: In
>>> /Volumes/Work/Kitware/vtk-cvs/VolumeRendering/vtkOpenGLGPUVolumeRayCastMapper.cxx,
>>> line 4128
>>> vtkOpenGLGPUVolumeRayCastMapper (0x10081a000): Rendering failed
>>> because the following OpenGL extensions are required but not
>>> supported:
>>>
>>> Segmentation fault
>>>
>>>
>>> There are also some rendering errors related to combined clipping and
>>> cropping that I see under Linux.  Cropping blocks being displayed when
>>> they are not flagged, or blocks displayed on the wrong side of the
>>> clipping plane.  I'm not sure if these were present with VTKEdge.  I
>>> can provide screenshots when I get back to my Linux PC this evening.
>>>
>>>  - David
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>>
>>
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>
>
>
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