[Paraview] Box clipping is very slow and wasteful!

[Armin Wehrfritz]

This indicates that ParaView is not selecting a subset of your current 
dataset, but creates a new one.  Things like that happen, when you have 
a structured dataset and apply e.g. the threshold or clipping filter. 
By this, you do not only duplicate a part of the orignal data, you also 
create a unstructured dataset which uses significantly more memory than 
a structured dataset.

So, which kind of dataset do you have?

If you have a structured grid (e.g. vtkImageData, vtkRectilinearGrid, 
vtkStructuredGrid) then you could use the "Extract Subset" instead of 
the clipping filter.

-Armin





On 07/06/2015 03:47 PM, Dinu Patirniche wrote:
> Hi everybody,
>
> I'm new to this forum, and I am not entirely sure if this is the right
> place to post this question, so please direct me to the right corner if
> that should be the case.
>
> Ok - to the technical bit now: I am using paraview 4.3.1 to load a 2gb
> vtk dataset. One the volume is loaded, I see a memory increase of about
> 7gb. Now, as a very first thing, I want to clip the volume, to about a
> 10th (with the box option selected from the clip menu). Now, I set up
> the box from which I want to extract the volume - but the entire rest of
> physical memory (about 5gb) gets eaten up plus another 32gb swap space.
> By than, paraview gets killed and I have to start all over again. So why
> is it that selecting a small range out of a 7gb volume ends up taking
> least 37gbs of memory?
>
> Thanks.
> Dinu.
>
>
>
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