[vtkusers] [vtk-developers] [vtk-users] OpenGL2 - GPU Volume Rendering performance

[Aashish Chaudhary]

Also,

Do you have shading enabled? We fixed a bug with shading that was causing
the slow performance a while back. I don't remember if that was included in
4.4 or not ( I can check ).

- Aashish

On Mon, Oct 26, 2015 at 1:53 PM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> Simon,
>
> What kind of dataset you are using? Depending on the data type you might
> be using
> the GPU one or the unstructured renderer. The performance we measured is
> related to the GPU ray cast mapper
> and will apply only to the vtkImageData inputs.
>
> Also, helpful would be is if you can tell if the new mapper is bringing
> low resolution when you interact with the volume (and whether or not it
> happens with old mapper).
>
> Thanks,
>
>
> On Mon, Oct 26, 2015 at 1:47 PM, Simon ESNEAULT <simon.esneault at gmail.com>
> wrote:
>
>> Hi All,
>>
>> We are trying to make the switch to the new OpenGL2 backend for our
>> application, and although the switch was easy (thanks for not breaking the
>> API ;) ), we can see a significant slowdown on the GPU volume rendering
>> part, especially during interaction. Typically we dropped from 15/20 fps to
>> 7/8 fps, on the same machine (Win32, Nvidia Quadro K420), with the same
>> code around.
>>
>> This slow down can be seen in ParaView, if you compare the latest 4.4
>> OpenGL2 build with the classic 4.4 build while volume rendering a big
>> enough volume (512^3)
>>
>> The blog post here
>> http://www.kitware.com/blog/home/post/976
>> claims that the new GPU volume rendering implementation should be faster
>> than the old one, is there some more detailed explanation somewhere ? Are
>> there some important parameters that can make the difference ?
>>
>> Thanks,
>>
>> Simon
>>
>> PS : The polygonal rendering seems a lot faster with the new backend !
>>
>> --
>> ------------------------------------------------------------------
>> Simon Esneault
>> Rennes, France
>> ------------------------------------------------------------------
>>
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>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>



-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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