[vtkusers] VTK 5.6.0 vtkGPUVolumeRayCastMapper very slow?

[Elvis Chen]

hi,

Thanks for the reply.  On a Windows-7 (64-bit) system with Visual Studio
Express 2008 (32bit), is it safe to use the Feb/2010 DirectX SDK instead of
the one listed on VTKEdge FAQ (which was dated aug/2008 and no Windows-7
support)?


On Mon, May 10, 2010 at 3:54 PM, Francois Bertel <
francois.bertel at kitware.com> wrote:

> In short (ie that what you will find reading the VTKEdge FAQ), to make
> it work properly under Windows with big datasets, you need to compile
> VTK against the DirectX SDK.
>
> Just to be clear, DirectX is not used for rendering, but it is just
> for requesting information about the GPU (amount of VRAM). OpenGL is
> used for rendering.
>
> On Mon, May 10, 2010 at 3:14 PM, Wagner Sales <wsales at gmail.com> wrote:
> > Hi Elvis,
> >
> > Since vtkGPUVolumeRayCastMapper comes from VTKEdge, you can follow the
> > instructions at
> >
> http://vtkedge.org/Wiki/VTKEdge:FAQ#How_can_I_make_vtkKWEGPUVolumeRayCastMapper_run_as_fast_as_in_VolView_3.0.3F
> >
> > Regards,
> >
> > Wagner Sales
> >
> > 2010/5/10 Elvis Chen <elvis.chen at gmail.com>
> >>
> >> greetings,
> >> I've just compiled VTK 5.6.0 and was testing vtkGPUVolumeRayCastMapper
> >> using the GPURenderDemo.cxx.  Using a CT volume available to me
> >> (512x512x481, short), I found the rendering to be VERY slow:  it is
> >> non-interactive at all.  If I use a mouse to change the camera position,
> I
> >> basically have to wait about 5-8 seconds for the rendering to complete.
> >> I'm using:
> >> Windows-7, 64bit
> >> Intel i7-860 (4 core at 2.80GHz)
> >> 4GB RAM
> >> Nvidia GTX260 with 196.21 driver, 896MB of video RAM
> >> Visual Studio Express 2008
> >> VTK 5.6.0 was compiled with all the standard options, except with python
> >> binding (ON).
> >> My questions are:
> >> 1) is there a way to display the frame rate to quantify the rendering
> >> speed?
> >> 2) the CT volume is about 240MB, which should fit inside the video RAM.
> >>  Has anyone else notice the slow speed?  Should I expect
> >> vtkGPUVolumeRayCastmapper to be faster (or slower) than
> >> vtkFixedPointVolumeRayCastMapper?
> >>
> >> Once I know how to do 1) I'll write a small program to test the speed
> >> difference between
> >> vtkGPUVolumeRayCastMapper/vtkFixedPointVolumeRaycastMapper.
> >> any insight is very much appreciated,
> >> Elvis
> >>
> >> _______________________________________________
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> >>
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> >>
> >> Please keep messages on-topic and check the VTK FAQ at:
> >> http://www.vtk.org/Wiki/VTK_FAQ
> >>
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> >
> >
> > _______________________________________________
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
> > http://www.kitware.com/opensource/opensource.html
> >
> > Please keep messages on-topic and check the VTK FAQ at:
> > http://www.vtk.org/Wiki/VTK_FAQ
> >
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> >
>
>
>
> --
> François Bertel, PhD  | Kitware Inc. Suite 204
> 1 (518) 371 3971 x113 | 28 Corporate Drive
>                      | Clifton Park NY 12065, USA
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
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