[vtkusers] OffScreen Rendering using Mangled Mesa

[David E DeMarle]

My point was, don't use Mangled Mesa, that is a very different thing
than OSMesa.

And yes vtk offscreen rendering does not generally require OSMesa.
That said, if you use the GPU then there are platform, driver and card
peculiarities (ex creating an empty window if none is yet present just
to get a GL context).

See Rendering/Testing/Cxx/TestOSConeCxx.cxx
(http://www.cdash.org/CDash/testSummary.php?project=11&name=OSCone-image&date=2010-01-19).

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109



On Tue, Jan 19, 2010 at 3:04 PM, Gerrick Bivins
<gbivins at objectreservoir.com> wrote:
> Ha!
>  ;)
> I don't know how to do it in VTK with OpenGL.
> I went to the examples to see how to do it after reading David DeMarle's
> earlier post in this thread!
> Maybe he can shed some light on it.
> Gerrick
>
> On Tue, Jan 19, 2010 at 1:55 PM, David Doria <daviddoria+vtk at gmail.com>
> wrote:
>>
>> On Tue, Jan 19, 2010 at 2:43 PM, Gerrick Bivins
>> <gbivins at objectreservoir.com> wrote:
>>>
>>> Hi Dave,
>>> Are you suggesting that we don't need to use mesa for offscreen rendering
>>> if our graphics cards support it?
>>> This is what I thought but the example for this (these are pretty new,
>>> correct?) still uses Mesa:
>>> (http://www.vtk.org/Wiki/VTK_Examples_Off_Screen_Rendering)
>>>
>>> Gerrick
>>>
>>> On Mon, Jan 18, 2010 at 12:49 PM, David E DeMarle
>>> <dave.demarle at kitware.com> wrote:
>>>>
>>>> I recommend against venturing down the mangled mesa path. First, its
>>>> main use, that of providing offscreen rendering to supplement GPUs
>>>> that lack it, is mostly obviated by recent GPUs. If your cards still
>>>> lack support, it is far better to use Mesa's own OSMesa library.
>>>> Secondly, neither the mesa nor VTK communities have supported it in
>>>> several years.
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> R&D Engineer
>>>> 28 Corporate Drive
>>>> Clifton Park, NY 12065-8662
>>>> Phone: 518-371-3971 x109
>>>>
>>>>
>>>>
>>>> On Mon, Jan 18, 2010 at 1:41 PM, Hassan Amin <hassan.amin at nu.edu.pk>
>>>> wrote:
>>>> > Hi,
>>>> >
>>>> >  I set up various options regarding rendering and offscreen rendering
>>>> > in VTK, but it requires mangled mesa. I am using vtk 5.2.1 and ubuntu
>>>> > 9.1. I was wondering which packages on ubuntu will provide appropriate
>>>> > version of mesa for me. Currently, I am getting the following error
>>>> > when compiling vtk :
>>>> >
>>>> > [ 70%] Building CXX object
>>>> > Rendering/CMakeFiles/vtkRendering.dir/vtkOpenGLExtensionManager.o
>>>> > /home/hassan/vision/VTK/Rendering/vtkOpenGLExtensionManager.cxx: In
>>>> > member function ‘virtual void (*
>>>> > vtkOpenGLExtensionManager::GetProcAddress(const char*))()’:
>>>> > /home/hassan/vision/VTK/Rendering/vtkOpenGLExtensionManager.cxx:270:
>>>> > error: ‘glXGetProcAddressARB’ was not declared in this scope
>>>> > make[2]: ***
>>>> > [Rendering/CMakeFiles/vtkRendering.dir/vtkOpenGLExtensionManager.o]
>>>> > Error 1
>>>> > make[1]: *** [Rendering/CMakeFiles/vtkRendering.dir/all] Error 2
>>>> > make: *** [all] Error 2
>>>> >
>>>> > Any help in resolving this error will be appreciated.
>>>> >
>>>> > Best Wishes,
>>>> >
>>>> > --
>>>> > Dr. Hassan Amin
>>>> > Assistant Professor
>>>> > Head of Computer Science Department
>>>> > National University(NUCES)
>>>> > Peshawar Campus
>>>> > Pakistan
>>>> > Phone:0092-(0)91-111-128-128
>>>> > Email: hassan.amin at nu.edu.pk
>>
>> Gerrick,
>> Yes, these are new, but so am I, so it doesn't mean they are
>> correct/current :)
>>
>> If you find a better/newer way to do it, please modify the example to
>> reflect it. I wasn't trying to demonstrate using mesa, just using offscreen
>> rendering. That was the only way I found how to do it. If mesa is no longer
>> supported, we should definitely demonstrate how to do offscreen rendering
>> without it.
>> Thanks,
>> David
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>
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