[vtkusers] VTK 5.6.0 vtkGPUVolumeRayCastMapper very slow?
elvis.chen at gmail.com
Tue May 11 12:09:10 EDT 2010
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
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
> > 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,
> >> 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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> François Bertel, PhD | Kitware Inc. Suite 204
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