[vtkusers] VTK & GPU

[Karthik Krishnan]

Sharmila :

On Mon, Jul 27, 2009 at 3:04 AM, Sharmila Subbiah <sharmimohan at yahoo.com>wrote:

> Hi,
>
> We were using VTK for volume rendering and some image operations. Now we
> are moving towards CUDA for real-time image processing for an application
> with high performance constraints. We want to make use of both CUDA and VTK
> for processing. Regarding this, we have the following questions.
> 1) How much of overhead does VTK add over OpenGL?


There is a measurable overhead. VTK provides the advantage of a higher level
abtraction with lots of flexibility and that trades off with some loss in
performance. There are ways to minimize these. One would need specifics.


>
> 2) How much does VTK leverage the GPU capabilities? How about utilizing the
> large number of cores available on NVIDIA CUDA-enabled GPU?


Please take a look at VTKEdge. ( vtkedge.org )

As regards leveraging GPU capabilities, the library provides GPU-based
volumetric ray casting, GPU-accelerated filters for computing 2D LIC on
vtkImageData or vtkStructuredGrid, GPU versions of Feldkamp back projection,
several GPU-accelerated image processing algorithms, and a couple of CUDA
enabled VTK-classes, (such as FFT implementation using CUDA).


>
> 3) How much of interoperability do we have between VTK and CUDA? Can VTK
> and CUDA share the buffer objects on GPU, or will there be additional data
> transfers between GPU and CPU?
>
> Thanks,
> Sharmila
>
>
>
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