[Paraview] FPS drop in stereo mode

[Aashish Chaudhary]

On Fri, Jun 14, 2013 at 9:03 AM, Stephan Rogge
<Stephan.Rogge at tu-cottbus.de>wrote:

> Aashish,
>
> the quad buffer explenation does make sense. But after some more testing
> with the "old" PV version (ParaView_4.0-RC1-51-g2965c8) on a machine with
> *  a NVidia Quadro 5000 and
> * a machine with 2 NVidia Quadro K5000 (SLI),
> I observed a FPS drop in all stereo modes except "Crystal Eyes" which is
> hard to measure with fraps. The FPS overly is not visible in that stereo
> mode.
>

As you said earlier, the FPS will drop but not as hard as you have seen on
GTX cards. How does the FPS drop on 5000 compares with the FPS drop on GTX?

>
> When I use "SplitViewportHorizontal" as stereo mode on my Kepler GPUs I can
> see a FPS drop. Interestingly the rate depends on the ParaView's window
> size. The smaller the window is the higher the rate and vice versa. I guess
> that a post process, which copies pixel between buffers, need some more
> time
> for execution. Is it possible?
>

Yes, that mode  performs the copy between buffers to produce the final
image.

>
> Regards,
> Stephan
>
> Von: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> Gesendet: Donnerstag, 13. Juni 2013 17:51
> An: Stephan Rogge
> Cc: ParaView list
> Betreff: Re: [Paraview] FPS drop in stereo mode
>
> Hi Stephan,
>
> GeForce GTX 580 are not great for stereo rendering as I believe they don't
> support Quad buffered stereo
>  (
> http://3dvision-blog.com/3840-nvidia-with-a-new-high-end-gpu-namely-the-ge
> force-gtx-580/).
> In that case, I believe VTK will perform software stereo implementation and
> that's why your performance will go down quite a bit.
>
> I don't have the latest card but normally the consumer level card don't
> support stereo that well (although this might not be the case with recent
> NVIDIA cards).
>
> Let us know if you find this performance degradation on your Quadro cards
> as
> well with latest paraview.
>
> Thanks,
>
>
> On Thu, Jun 13, 2013 at 11:13 AM, Stephan Rogge
> <Stephan.Rogge at tu-cottbus.de> wrote:
> Aashish,
>
> it doesn't matter which stereo type is activated. I've got only 20 FPS...
> This is tested on GeForce GTX 580. The ParaView version is pulled from
> latest git-master.
>
> Surprisingly, this problem does not occurs on my Render-PC of our
> CAVE-system. There I have 2 K5000 NV Quadro cards. But the code base is
> older (PV RC1), though I have to check it, with an updated code base and
> see, whether this fps drop remains.
>
> Cheers,
> Stephan
>
> Von: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> Gesendet: Donnerstag, 13. Juni 2013 16:49
> An: Stephan Rogge
> Cc: ParaView list
> Betreff: Re: [Paraview] FPS drop in stereo mode
>
> Hi Stephan,
>
> What particular stereo type you chose for this comparison? Also what
> graphics hardware you have?
>
> Thanks,
>
>
> On Mon, Jun 10, 2013 at 10:47 AM, Stephan Rogge
> <Stephan.Rogge at tu-cottbus.de> wrote:
> Hello,
>
> I observed an unexpected frame rate drop when using one of PV's supported
> stereo modes within an empty scene.
>
> Considering
> * OS: Windows
> * V-Sync: On
> * Application to display FPS (e.g. www.fraps.com)
> * Latest ParaView from git-master
>
> Following steps should emphasizes the frame rate drop:
> 1. Open ParaView without any stereo mode
> 2. Rotate or drag the camera in the 3D view for several seconds and watch
> at
> the frame rate (should be around 60 FPS)
> 3. Close ParaView
> 4. Open ParaView with "--stereo" flag enabled
> 5. Rotate or drag the camera in the 3D view for several seconds and watch
> at
> the frame rate (should be around 22 FPS)
>
> Obviously, stereo rendering should take twice the time of a monocular
> rendering. But this should only occurs in more complex scenes. Can anyone
> reproduce this behavior? Is this a BUG?
>
> Best regards,
> Stephan
>
>
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>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
>
>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
>


-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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