[vtkusers] performance issue

[David Gobbi]

How big is the image that you are producing?  My guess is that the
slowest bits are vtkImplicitDataSet and vtkImplicitFunctionToImageStencil.
Did you use these in your original code?

 - David


On Wed, Feb 23, 2011 at 1:52 PM, vlibertiaux <vlibertiaux at gmail.com> wrote:
>
> Hi everyone,
>
> thanks to David Gobbi's help, I was able to design my clipvolumedata
> function. Now the program does the job correctly
>
> But now I have a very strange performance issue:
> the original program I use was compiled against vtk4.4 maybe two or three
> years ago.  I compiled it against vtk5.6 and made some changes to get rid of
> the deprecated functions.  Some other function didn't work anymore (like the
> original clipvolumedata which used vtkImageStencil and vtkImageClip rather
> than vtkImageReslice).
>
> The new program, with only a few changes, is almost 2 times slower than the
> original one !  For example, my ClipVolumeData function (code here:
> http://codepad.org/Rq4EnnDV) takes *18* seconds to execute !
>  There are other parts of the code I didn't change at all which are slower
> than the version compiled against vtk4.4
> Time is really an issue for my application.  According to you, what could be
> the cause of this behaviour and how can I solve this issue ?
>
> Thanks in advance for your help,
>
> Vincent
> --
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