[vtkusers] GPU Volume Rendering / Cuda

[Darshan Pai]

Good information . Maybe that was why I was not able to get a good rendering
either . Will try it

Thanks

On Sat, Mar 6, 2010 at 4:34 AM, Lars Friedrich Lars
<lars-friedrich at gmx.net>wrote:

> Hello,
>
> I do not know about your concrete geometry setup, OS or further settings
> which may dramatically influence rendering speed, but I would like to note
> one thing that may be interesting for you and possibly for other vtkusers
> (in the case if you have not already been aware of it before).
>
> There are two relatively important properties in the base class
> vtkGPUVolumeRayCastMapper: MaxMemoryInBytes (corresponds to maximum
> dedicated video memory of the GPU) and MaxMemoryFraction (maximum fraction
> of available video memory to be used). If you compile VTK with NV-CONTROL X
> extension on Linux or DirectX SDK on windows, vtkGPUVolumeRayCastMapper is
> able to retrieve these hardware props automatically (through vtkGPUInfo).
> Have a look at:
> http://www.vtk.org/Wiki/VTKEdge:FAQ#Compile_time
>
> If you did not compile VTK with one of these options,
> vtkGPUVolumeRayCastMapper uses some internal default estimation of video
> memory size which is statically 128 MB. The default value for max memory
> fraction is 0.75 in either case. Resultant available video memory without
> extensions: 96MB.
>
> Your situation, assuming unsigned short (16bit) volume: 512*512*200 gives
> 100MB.
>
> If you look at the internals of vtkOpenGLGPUVolumeRayCastMapper you will
> notice that there is a query like this: (volumesize <=
> maxmemoryinbytes*maxmemoryfraction)?
> ... even if the volume could be successfully transferred to the GPU without
> any errors, it may not be respected by the code (100 > 96) and STREAMING
> will be activated internally. This is that the volume will be splitted into
> slabs and then transferred to the GPU. Moreover, this usually requires
> further internal FB ping-pong to compensate the overlapping regions (but
> that depends on the blending mode you are using). Streaming and ping-pong
> will basically slow down rendering.
>
> Therefore, make sure that you either compile VTK with the respective
> extension or set MaxMemoryInBytes manually to 256MB (which is your card's
> video mem size) and possibly increase MaxMemoryFraction to 0.95 or so.
>
> HTH,
>
> lars
>
>
> -------- Original-Nachricht --------
> > Datum: Fri, 5 Mar 2010 19:43:45 -0800 (PST)
> > Von: superzz <jxdw_zlf at yahoo.com.cn>
> > An: vtkusers at vtk.org
> > Betreff: [vtkusers]  GPU Volume Rendering / Cuda
>
> >
> > Hello
> > I am leveraging vtkGPUVolumeRayCastMapper to render a 512*512*200
> dataset.
> > The window size is 800x800. It is much faster than CPU volume rendering.
> > But
> > the speed is still not satisifying. The FPS is only 1. My video card is
> > NVIDIA Quadro NVS 160M.
> >
> > I am considering to update my video card. Video card has some techinal
> > parameters. I do not know which one is the most important for GPU volume
> > rendering. Core Clock, Memory Size, Memory Interface or anything else?
> >
> > The desired FPS of mine is at least 10.
> >
> > I also find some a vtk volume rendering project is leveraging CUDA. Will
> > CUDA greately accelerate rendering speed?
> >
> > Thanks
> >
> > superZZ
> > --
> > View this message in context:
> >
> http://old.nabble.com/GPU-Volume-Rendering---Cuda-tp27801812p27801812.html
> > Sent from the VTK - Users mailing list archive at Nabble.com.
> >
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