[vtkusers] VTK 5.6.0 vtkGPUVolumeRayCastMapper very slow?

[Wagner Sales]

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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