[vtkusers] VTK and GPU Support

[Ulrich Kemloh]

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> 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> 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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