[vtkusers] VTK and GPU Support

[Burlen Loring]

There's a better way.  to check about which driver and GPU are in use is 
the  vtkRenderingOpenGLCxx-LoadOpenGLExtension ctest. run from the build 
dir like this : "ctest -R LoadOpenGLExt". For example here is what this 
reports on my system: 
http://open.cdash.org/testDetails.php?test=252272562&build=3317324
don't forget to compile with the CMakeLists.txt option set to 
BUILD_TESTING=ON.

On 05/01/2014 04:59 AM, Ulrich Kemloh wrote:
> Hi Aashish and thanks for your reply.
>
> It is a release build and
> actually renders 1000 spheres at 3FPS.
> with 100 spheres, I am around 18 FPS.
>
> Also I have checked the GPU load , it is around 9%. So I guess it is 
> not used.
> But again what wonder me much is the fact that
>
>
> _renderingWindows->isDirect() returns false (meaning no hardware 
> rendering I guess)
> and the test  VTKRenderingOpenGLCxx_tests.exe  tells "There is 0 GPU (s)"
>
> What I have done is reducing the resolution of the sphere from 20 to 10.
> The spheres are also running through a triangle filter and a striper.
> Now the rendering speed is around 9FPS.
> It is just a workaround.
>
>
> I am really wondering if there are special compilation steps(
> like adding special flags)
> that must be undertaken  for VTK to start using your Graphic card.
>
>
> Thanks you again for pointing me to APITrace. I will continue the 
> investigations.
>
>
> Regards
> Ulrich
>
>
> On 29 Apr 2014, at 06:00, Aashish Chaudhary 
> <aashish.chaudhary at kitware.com <mailto:aashish.chaudhary at kitware.com>> 
> wrote:
>
>> Is this a debug windows build or a release build? When you change
>> number of spheres, do you see any performance changes (in proportion)?
>>
>> When you say slow, how slow it is < 1O FPS? All of these information 
>> will be useful.
>>
>> Also you can try to use APITrace to debug VTK GL calls.
>>
>> - Aashish
>>
>>
>>
>> On Sun, Apr 27, 2014 at 7:48 AM, Ulrich Kemloh 
>> <kemlohulrich at gmail.com <mailto:kemlohulrich at gmail.com>> wrote:
>>
>>     Hello everyone,
>>
>>     I am having some trouble activating GPU support in my VTK
>>     Application.
>>     I was wondering why my application was so slow although I am using
>>      an nvidia quadro 4000 with the latest driver installed.
>>
>>     The rendering is happening in a qvtkWidget and I am basically
>>     just rendering 2000 spheres (using glyphs).
>>
>>     _renderingWindows->isDirect() returns false
>>     and the tests  VTKRenderingOpenGLCxx_tests.exe tells "There is 0
>>     GPU (s)"
>>
>>     So I guess I am missing a very important point.
>>
>>     Does vtk needs a special flag while building the libraries?
>>
>>     I am using the 64bit version of Win7, VTK 6.1 and QT5.2.
>>
>>     I am very looking forward to any help
>>
>>     Thanks in advance and regards
>>
>>     Ulrich
>>
>>
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>>
>>
>> -- 
>> /| Aashish Chaudhary
>> | Technical Leader
>> | Kitware Inc.
>> /
>> /| http://www.kitware.com/company/team/chaudhary.html/
>
>
>
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