[vtk-developers] VTKEdge on OS X 10.6

[Fauze Polpeta]

Hi Francois;

Unless the pre-processor rule (#ifdef __APPLE__ ...) is inputed during
CMake configuration in Snow Leopard, I'm not seeing it in
vtkKWEOpenGLGPUVolumeRayCastMapper.cxx any more.

Since in my first attempts I copied my configuration from Snow Leopard
to Leopard, such code was there.

Further, in order to inspect the problems I'm facing with GPU-based
Ray Cast, I checked out the code again in Leopard and didn't see this
piece of code any more.

Best Regards

Fauze

On Mon, Feb 22, 2010 at 11:39 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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>
>
>
> --
> François Bertel, PhD  | Kitware Inc. Suite 204
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